在不使用/和%运算符的情况下，检查数字是否为5的倍数-yiteyi-C++库

给定一个正数n，编写一个函数isMultipleof5（int n），如果n是5的倍数，则返回true，否则返回false。 您不允许使用%和/运算符 . 方法1（重复从n中减去5） 运行一个循环，当n大于0时，从循环中的n中减去5。循环终止后，检查n是否为0。如果n变成0，那么n是5的倍数，否则不是。

null

C++

                         #include <iostream>                       
                         using                                     namespace                                     std;                       
           
                         // assumes that n is a positive integer                       
                         bool                                     isMultipleof5 (                                     int                                     n)                       
                         {                       
                                                 while                                     ( n > 0 )                       
                                                 n = n - 5;                       
           
                                                 if                                     ( n == 0 )                       
                                                 return                                     true                                     ;                       
           
                                                 return                                     false                                     ;                       
                         }                       
           
                         // Driver Code                       
                         int                                     main()                       
                         {                       
                                                 int                                     n = 19;                       
                                                 if                                     ( isMultipleof5(n) ==                                     true                                     )                       
                                                 cout << n <<                                     " is multiple of 5"                                     ;                       
                                                 else                       
                                                 cout << n <<                                     " is not a multiple of 5"                                     ;                       
           
                                                 return                                     0;                       
                         }                       
           
                         // This code is contributed by SHUBHAMSINGH10                       

C

                         #include<stdio.h>                       
           
                         // assumes that n is a positive integer                       
                         bool                                     isMultipleof5 (                                     int                                     n)                       
                         {                       
                                                 while                                     ( n > 0 )                       
                                                 n = n - 5;                       
           
                                                 if                                     ( n == 0 )                       
                                                 return                                     true                                     ;                       
           
                                                 return                                     false                                     ;                       
                         }                       
           
                         // Driver Code                       
                         int                                     main()                       
                         {                       
                                                 int                                     n = 19;                       
                                                 if                                     ( isMultipleof5(n) ==                                     true                                     )                       
                                                 printf                                     (                                     "%d is multiple of 5"                                     , n);                       
                                                 else                       
                                                 printf                                     (                                     "%d is not a multiple of 5"                                     , n);                       
           
                                                 return                                     0;                       
                         }                       

JAVA

                         // Java code to check if a number                       
                         // is multiple of 5 without using                       
                         // '/' and '%' operators                       
                         class                                     GFG                       
                         {                       
                                   
                         // assumes that n is a positive integer                       
                         static                                     boolean                                     isMultipleof5 (                                     int                                     n)                       
                         {                       
                                                 while                                     (n >                                     0                                     )                       
                                                 n = n -                                     5                                     ;                       
           
                                                 if                                     (n ==                                     0                                     )                       
                                                 return                                     true                                     ;                       
           
                                                 return                                     false                                     ;                       
                         }                       
           
                         // Driver Code                       
                         public                                     static                                     void                                     main(String[] args)                       
                         {                       
                                                 int                                     n =                                     19                                     ;                       
                                                 if                                     (isMultipleof5(n) ==                                     true                                     )                       
                                                 System.out.printf(                                     "%d is multiple of 5"                                     , n);                       
                                                 else                       
                                                 System.out.printf(                                     "%d is not a multiple of 5"                                     , n);                       
                         }                       
                         }                       
           
                         // This code is contributed by Smitha DInesh Semwal                       

Python3

                         # Python code to check                       
                         # if a number is multiple of                       
                         # 5 without using / and %                       
           
                         # Assumes that n is a positive integer                       
                         def                                     isMultipleof5(n):                       
                                   
                                                 while                                     ( n >                                     0                                     ):                       
                                                 n                                     =                                     n                                     -                                     5                       
           
                                                 if                                     ( n                                     =                                     =                                     0                                     ):                       
                                                 return                                     1                       
           
                                                 return                                     0                       
                                   
                         # Driver Code                       
                         i                                     =                                     19                       
                         if                                     ( isMultipleof5(i)                                     =                                     =                                     1                                     ):                       
                                                 print                                     (i,                                     "is multiple of 5"                                     )                       
                         else                                     :                       
                                                 print                                     (i,                                     "is not a multiple of 5"                                     )                       
           
                         # This code is contributed                       
                         # by Sumit Sudhakar                       

C#

                         // C# code to check if a number                       
                         // is multiple of 5 without using /                       
                         // and % operators                       
                         using                                     System;                       
           
                         class                                     GFG                       
                         {                       
                                   
                         // assumes that n is a positive integer                       
                         static                                     bool                                     isMultipleof5 (                                     int                                     n)                       
                         {                       
                                                 while                                     (n > 0)                       
                                                 n = n - 5;                       
           
                                                 if                                     (n == 0)                       
                                                 return                                     true                                     ;                       
           
                                                 return                                     false                                     ;                       
                         }                       
           
                         // Driver Code                       
                         public                                     static                                     void                                     Main()                       
                         {                       
                                                 int                                     n = 19;                       
                                                 if                                     (isMultipleof5(n) ==                                     true                                     )                       
                                                 Console.Write(n +                                     " is multiple of 5"                                     );                       
                                                 else                       
                                                 Console.Write(n +                                     " is not a multiple of 5"                                     );                       
                         }                       
                         }                       
           
                         // This code is contributed by nitin mittal.                       

PHP

                         <?php                       
                         // assumes that n is a positive integer                       
                         function                                     isMultipleof5 (                                     $n                                     )                       
                         {                       
                                                 while                                     (                                     $n                                     > 0 )                       
                                                 $n                                     =                                     $n                                     - 5;                       
           
                                                 if                                     (                                     $n                                     == 0 )                       
                                                 return                                     true;                       
           
                                                 return                                     false;                       
                         }                       
           
                         // Driver Code                       
                                                 $n                                     = 19;                       
                                                 if                                     ( isMultipleof5(                                     $n                                     ) == true )                       
                                                 echo                                     (                                     "$n is multiple of 5"                                     );                       
                                                 else                       
                                                 echo                                     (                                     "$n is not a multiple of 5"                                     );                       
                                   
                         // This code is contributed by nitin mittal.                       
                         ?>                       

Javascript

                         <script>                       
           
                         // JavaScript program for the above approach                       
           
                         // assumes that n is a positive integer                       
                         function                                     isMultipleof5 (n)                       
                         {                       
                                                 while                                     (n > 0)                       
                                                 n = n - 5;                       
           
                                                 if                                     (n == 0)                       
                                                 return                                     true                                     ;                       
           
                                                 return                                     false                                     ;                       
                         }                       
           
                         // Driver Code                       
                                                 let n = 19;                       
                                                 if                                     (isMultipleof5(n) ==                                     true                                     )                       
                                                 document.write(n +                                     " is multiple of 5"                                     );                       
                                                 else                       
                                                 document.write(n +                                     " is not a multiple of 5"                                     );                       
           
                         </script>                       

输出：

19 is not a multiple of 5

时间复杂性： O（n/5）

辅助空间： O（1）

方法2（转换为字符串并检查最后一个字符） 将n转换为字符串，并检查字符串的最后一个字符。如果最后一个字符是“5”或“0”，则n是5的倍数，否则不是。

C++

                         #include <bits/stdc++.h>                       
                         using                                     namespace                                     std;                       
           
                         // Assuming that integer takes 4 bytes, there                       
                         // can be maximum 10 digits in a integer                       
                         # define MAX 11                       
           
                         bool                                     isMultipleof5(                                     int                                     n)                       
                         {                       
                                                 char                                     str[MAX];                       
                                                 int                                     len =                                     strlen                                     (str);                       
                                   
                                                 // Check the last character of string                       
                                                 if                                     ( str[len - 1] ==                                     '5'                                     ||                       
                                                 str[len - 1] ==                                     '0'                                     )                       
                                   
                                                 return                                     true                                     ;                       
                                   
                                                 return                                     false                                     ;                       
                         }                       
           
                         // Driver Code                       
                         int                                     main()                       
                         {                       
                                                 int                                     n = 19;                       
                                                 if                                     ( isMultipleof5(n) ==                                     true                                     )                       
                                                 cout << n <<                                     " is multiple of 5"                                     <<endl;                       
                                                 else                       
                                                 cout << n <<                                     " is not multiple of 5"                                     <<endl;                       
           
                                                 return                                     0;                       
                         }                       
           
                         // This code is contributed by SHUBHAMSINGH10                       

C

                         #include<stdio.h>                       
                         #include<stdlib.h>                       
                         #include<string.h>                       
           
                         // Assuming that integer takes 4 bytes, there                       
                         // can be maximum 10 digits in a integer                       
                         # define MAX 11                       
           
                         bool                                     isMultipleof5(                                     int                                     n)                       
                         {                       
                                                 char                                     str[MAX];                       
                                                 int                                     len =                                     strlen                                     (str);                       
                                   
                                                 // Check the last character of string                       
                                                 if                                     ( str[len - 1] ==                                     '5'                                     ||                       
                                                 str[len - 1] ==                                     '0'                                     )                       
                                   
                                                 return                                     true                                     ;                       
                                   
                                                 return                                     false                                     ;                       
                         }                       
           
                         // Driver Code                       
                         int                                     main()                       
                         {                       
                                                 int                                     n = 19;                       
                                                 if                                     ( isMultipleof5(n) ==                                     true                                     )                       
                                                 printf                                     (                                     "%d is multiple of 5"                                     , n);                       
                                                 else                       
                                                 printf                                     (                                     "%d is not a multiple of 5"                                     , n);                       
           
                                                 return                                     0;                       
                         }                       

JAVA

                         // Assuming that integer                       
                         // takes 4 bytes, there                       
                         // can be maximum 10                       
                         // digits in a integer                       
                         class                                     GFG                       
                         {                       
                         static                                     int                                     MAX =                                     11                                     ;                       
           
                         static                                     boolean                                     isMultipleof5(                                     int                                     n)                       
                         {                       
                                                 char                                     str[] =                                     new                                     char                                     [MAX];                       
                                                 int                                     len = str.length;                       
                                   
                                                 // Check the last                       
                                                 // character of string                       
                                                 if                                     (str[len -                                     1                                     ] ==                                     '5'                                     ||                       
                                                 str[len -                                     1                                     ] ==                                     '0'                                     )                       
                                   
                                                 return                                     true                                     ;                       
                                   
                                                 return                                     false                                     ;                       
                         }                       
           
                         // Driver Code                       
                         public                                     static                                     void                                     main(String[] args)                       
                         {                       
                                                 int                                     n =                                     19                                     ;                       
                                                 if                                     ( isMultipleof5(n) ==                                     true                                     )                       
                                                 System.out.println(n +                                     " is multiple "                                     +                       
                                                 "of 5"                                     );                       
                                                 else                       
                                                 System.out.println(n +                                     " is not a "                                     +                       
                                                 "multiple of 5"                                     );                       
                         }                       
                         }                       
           
                         // This code is contributed by mits                       

Python3

                         # Assuming that integer                       
                         # takes 4 bytes, there                       
                         # can be maximum 10                       
                         # digits in a integer                       
                         MAX                                     =                                     11                                     ;                       
           
                         def                                     isMultipleof5(n):                       
                                                 s                                     =                                     str                                     (n);                       
                                                 l                                     =                                     len                                     (s);                       
                                   
                                                 # Check the last                       
                                                 # character of string                       
                                                 if                                     (s[l                                     -                                     1                                     ]                                     =                                     =                                     '5'                                     or                       
                                                 s[l                                     -                                     1                                     ]                                     =                                     =                                     '0'                                     ):                       
                                                 return                                     True                                     ;                       
                                                 return                                     False                                     ;                       
           
                         # Driver Code                       
                         n                                     =                                     19                                     ;                       
                         if                                     (isMultipleof5(n)                                     =                                     =                                     True                                     ):                       
                                                 print                                     (n,                                     "is multiple of 5"                                     );                       
                         else                                     :                       
                                                 print                                     (n,                                     "is not a multiple of 5"                                     );                       
           
                         # This code is contributed by mits                       

C#

                         using                                     System;                       
           
                         // Assuming that integer                       
                         // takes 4 bytes, there                       
                         // can be maximum 10                       
                         // digits in a integer                       
                         class                                     GFG                       
                         {                       
                         static                                     int                                     MAX = 11;                       
           
                         static                                     bool                                     isMultipleof5(                                     int                                     n)                       
                         {                       
                                                 char                                     [] str =                                     new                                     char                                     [MAX];                       
                                                 int                                     len = str.Length;                       
                                   
                                                 // Check the last                       
                                                 // character of string                       
                                                 if                                     (str[len - 1] ==                                     '5'                                     ||                       
                                                 str[len - 1] ==                                     '0'                                     )                       
                                   
                                                 return                                     true                                     ;                       
                                   
                                                 return                                     false                                     ;                       
                         }                       
           
                         // Driver Code                       
                         static                                     void                                     Main()                       
                         {                       
                                                 int                                     n = 19;                       
                                                 if                                     ( isMultipleof5(n) ==                                     true                                     )                       
                                                 Console.WriteLine(                                     "{0} is "                                     +                       
                                                 "multiple of 5"                                     , n);                       
                                                 else                       
                                                 Console.WriteLine(                                     "{0} is not a "                                     +                       
                                                 "multiple of 5"                                     , n);                       
                         }                       
                         }                       
           
                         // This code is contributed by mits                       

PHP

                         <?php                       
                         // Assuming that integer                       
                         // takes 4 bytes, there                       
                         // can be maximum 10                       
                         // digits in a integer                       
                         $MAX                                     = 11;                       
           
                         function                                     isMultipleof5(                                     $n                                     )                       
                         {                       
                                                 global                                     $MAX                                     ;                       
                                                 $str                                     = (string)                                     $n                                     ;                       
                                                 $len                                     =                                     strlen                                     (                                     $str                                     );                       
                                   
                                                 // Check the last                       
                                                 // character of string                       
                                                 if                                     (                                     $str                                     [                                     $len                                     - 1] ==                                     '5'                                     ||                       
                                                 $str                                     [                                     $len                                     - 1] ==                                     '0'                                     )                       
                                   
                                                 return                                     true;                       
                                   
                                                 return                                     false;                       
                         }                       
           
                         // Driver Code                       
                         $n                                     = 19;                       
                         if                                     (isMultipleof5(                                     $n                                     ) == true )                       
                                                 echo                                     "$n is multiple of 5"                                     ;                       
                         else                       
                                                 echo                                     "$n is not a multiple of 5"                                     ;                       
           
                         // This code is contributed by mits                       
                         ?>                       

Javascript

                         <script>                       
           
                         // Assuming that integer                       
                         // takes 4 bytes, there                       
                         // can be maximum 10                       
                         // digits in a integer                       
                         MAX = 11;                       
           
                         function                                     isMultipleof5(n)                       
                         {                       
                                                 str = Array(n).fill(                                     ''                                     );                       
                                                 var                                     len = str.length;                       
                                   
                                                 // Check the last                       
                                                 // character of string                       
                                                 if                                     (str[len - 1] ==                                     '5'                                     ||                       
                                                 str[len - 1] ==                                     '0'                                     )                       
                                                 return                                     true                                     ;                       
                                   
                                                 return                                     false                                     ;                       
                         }                       
           
                         // Driver Code                       
                         var                                     n = 19;                       
                         if                                     ( isMultipleof5(n) ==                                     true                                     )                       
                                                 document.write(n +                                     " is multiple "                                     +                       
                                                 "of 5"                                     );                       
                         else                       
                                                 document.write(n +                                     " is not a "                                     +                       
                                                 "multiple of 5"                                     );                       
                                   
                         // This code is contributed by Amit Katiyar                       
                         </script>                       

输出：

19 is not a multiple of 5

时间复杂性： O（1）

辅助空间： O（最大值）

感谢Baban_Rathore提出这种方法。 方法3（将最后一位设置为0，并使用浮点技巧） 在两种情况下，数字n可以是5的倍数。当n的最后一位是5或10时。如果设置了n的二进制等价物中的最后一位（当最后一位为5时，可能是这种情况），那么我们使用n<<=1乘以2，以确保如果数字是5的倍数，那么最后一位为0。一旦我们这样做了，我们的工作就是检查最后一个数字是否为0，这可以通过使用浮点和整数比较技巧来实现。

C++

                         #include <iostream>                       
                         using                                     namespace                                     std;                       
                         bool                                     isMultipleof5(                                     int                                     n)                       
                         {                       
                                                 // If n is a multiple of 5 then we                       
                                                 // make sure that last digit of n is 0                       
                                                 if                                     ( (n & 1) == 1 )                       
                                                 n <<= 1;                       
                                   
                                                 float                                     x = n;                       
                                                 x = ( (                                     int                                     )(x * 0.1) ) * 10;                       
                                   
                                                 // If last digit of n is 0 then n                       
                                                 // will be equal to (int)x                       
                                                 if                                     ( (                                     int                                     )x == n )                       
                                                 return                                     true                                     ;                       
           
                                                 return                                     false                                     ;                       
                         }                       
           
                         // Driver Code                       
                         int                                     main()                       
                         {                       
                                                 int                                     i = 19;                       
                                                 if                                     ( isMultipleof5(i) ==                                     true                                     )                       
                                                 cout << i <<                                     " is multiple of 5"                                     ;                       
                                                 else                       
                                                 cout << i <<                                     " is not a multiple of 5"                                     ;                       
           
                                                 getchar                                     ();                       
                                                 return                                     0;                       
                         }                       
           
                         // This code is contributed by shubhamsingh10                       

C

                         #include<stdio.h>                       
           
                         bool                                     isMultipleof5(                                     int                                     n)                       
                         {                       
                                                 // If n is a multiple of 5 then we                       
                                                 // make sure that last digit of n is 0                       
                                                 if                                     ( (n & 1) == 1 )                       
                                                 n <<= 1;                       
                                   
                                                 float                                     x = n;                       
                                                 x = ( (                                     int                                     )(x * 0.1) ) * 10;                       
                                   
                                                 // If last digit of n is 0 then n                       
                                                 // will be equal to (int)x                       
                                                 if                                     ( (                                     int                                     )x == n )                       
                                                 return                                     true                                     ;                       
           
                                                 return                                     false                                     ;                       
                         }                       
           
                         // Driver Code                       
                         int                                     main()                       
                         {                       
                                                 int                                     i = 19;                       
                                                 if                                     ( isMultipleof5(i) ==                                     true                                     )                       
                                                 printf                                     (                                     "%d is multiple of 5"                                     , i);                       
                                                 else                       
                                                 printf                                     (                                     "%d is not a multiple of 5"                                     , i);                       
           
                                                 getchar                                     ();                       
                                                 return                                     0;                       
                         }                       

JAVA

                         // Java code to check if                       
                         // a number is multiple of                       
                         // 5 without using / and %                       
                         class                                     GFG                       
                         {                       
                         static                                     boolean                                     isMultipleof5(                                     int                                     n)                       
                         {                       
                                                 // If n is a multiple of 5                       
                                                 // then we make sure that                       
                                                 // last digit of n is 0                       
                                                 if                                     ((n &                                     1                                     ) ==                                     1                                     )                       
                                                 n <<=                                     1                                     ;                       
                                   
                                                 float                                     x = n;                       
                                                 x = ((                                     int                                     )(x *                                     0.1                                     )) *                                     10                                     ;                       
                                   
                                                 // If last digit of n is                       
                                                 // 0 then n will be equal                       
                                                 // to (int)x                       
                                                 if                                     ((                                     int                                     )x == n)                       
                                                 return                                     true                                     ;                       
           
                                                 return                                     false                                     ;                       
                         }                       
           
                         // Driver Code                       
                         public                                     static                                     void                                     main(String[] args)                       
                         {                       
                                                 int                                     i =                                     19                                     ;                       
                                                 if                                     (isMultipleof5(i) ==                                     true                                     )                       
                                                 System.out.println(i +                                     "is multiple of 5"                                     );                       
                                                 else                       
                                                 System.out.println(i +                                     " is not a "                                     +                       
                                                 "multiple of 5"                                     );                       
                         }                       
                         }                       
           
                         // This code is contributed                       
                         // by mits                       

Python3

                         # Python code to check                       
                         # if a number is multiple of                       
                         # 5 without using / and %                       
           
                         def                                     isMultipleof5(n):                       
                                   
                                                 # If n is a multiple of 5 then we                       
                                                 # make sure that last digit of n is 0                       
                                                 if                                     ( (n &                                     1                                     )                                     =                                     =                                     1                                     ):                       
                                                 n <<                                     =                                     1                                     ;                       
           
                                                 x                                     =                                     n                       
                                                 x                                     =                                     ( (                                     int                                     )(x                                     *                                     0.1                                     ) )                                     *                                     10                       
                                   
                                                 # If last digit of n is 0                       
                                                 # then n will be equal to x                       
                                                 if                                     ( x                                     =                                     =                                     n ):                       
                                                 return                                     1                       
           
                                                 return                                     0                       
                                   
                         # Driver Code                       
                         i                                     =                                     19                       
                         if                                     ( isMultipleof5(i)                                     =                                     =                                     1                                     ):                       
                                                 print                                     (i,                                     "is multiple of 5"                                     )                       
                         else                                     :                       
                                                 print                                     (i,                                     "is not a multiple of 5"                                     )                       
           
                         # This code is contributed                       
                         # by Sumit Sudhakar                       

C#

                         // C# code to check if                       
                         // a number is multiple of                       
                         // 5 without using / and %                       
                         class                                     GFG                       
                         {                       
                         static                                     bool                                     isMultipleof5(                                     int                                     n)                       
                         {                       
                                                 // If n is a multiple of 5                       
                                                 // then we make sure that                       
                                                 // last digit of n is 0                       
                                                 if                                     ((n & 1) == 1)                       
                                                 n <<= 1;                       
                                   
                                                 float                                     x = n;                       
                                                 x = ((                                     int                                     )(x * 0.1)) * 10;                       
                                   
                                                 // If last digit of n is                       
                                                 // 0 then n will be equal                       
                                                 // to (int)x                       
                                                 if                                     ((                                     int                                     )x == n)                       
                                                 return                                     true                                     ;                       
           
                                                 return                                     false                                     ;                       
                         }                       
           
                         // Driver Code                       
                         public                                     static                                     void                                     Main()                       
                         {                       
                                                 int                                     i = 19;                       
                                                 if                                     (isMultipleof5(i) ==                                     true                                     )                       
                                                 System.Console.WriteLine(i +                                     "is multiple of 5"                                     );                       
                                                 else                       
                                                 System.Console.WriteLine(i +                                     " is not a "                                     +                       
                                                 "multiple of 5"                                     );                       
                         }                       
                         }                       
           
                         // This code is contributed                       
                         // by mits                       

PHP

                         <?php                       
                         function                                     isMultipleof5(                                     $n                                     )                       
                         {                       
                                                 // If n is a multiple of 5                       
                                                 // then we make sure that                       
                                                 // last digit of n is 0                       
                                                 if                                     ((                                     $n                                     & 1) == 1 )                       
                                                 $n                                     <<= 1;                       
                                   
                                                 $x                                     =                                     $n                                     ;                       
                                                 $x                                     = ((int)(                                     $x                                     * 0.1)) * 10;                       
                                   
                                                 // If last digit of n                       
                                                 // is 0 then n will be                       
                                                 // equal to (int)x                       
                                                 if                                     ( (int)(                                     $x                                     ) ==                                     $n                                     )                       
                                                 return                                     true;                       
           
                                                 return                                     false;                       
                         }                       
           
                         // Driver Code                       
                         $i                                     = 19;                       
                         if                                     ( isMultipleof5(                                     $i                                     ) == true )                       
                                                 echo                                     "$i is multiple of 5"                                     ;                       
                         else                       
                                                 echo                                     "$i is not a multiple of 5"                                     ;                       
           
                         // This code is contributed by mits                       
                         ?>                       

Javascript

                         <script>                       
                         // JavaScript code to check if                       
                         // a number is multiple of                       
                         // 5 without using / and %                       
                         function                                     isMultipleof5( n)                       
                         {                       
           
                                                 // If n is a multiple of 5 then we                       
                                                 // make sure that last digit of n is 0                       
                                                 if                                     ( (n & 1) == 1 )                       
                                                 n <<= 1;                       
                                   
                                                 x = ( (int)(x * 0.1) ) * 10;                       
                                   
                                                 // If last digit of n is 0 then n                       
                                                 // will be equal to (int)x                       
                                                 if                                     ( (int)(x == n))                       
                                                 return                                     true                                     ;                       
                                   
                                                 return                                     false                                     ;                       
                         }                       
                                   
                         // Driver Code                       
                                                 i = 19;                       
                                                 if                                     ( isMultipleof5 ==                                     true                                     )                       
                                                 document.write( i +                                     " is multiple of 5"                                     );                       
                                                 else                       
                                                 document.write( i +                                     " is not a multiple of 5"                                     );                       
                                   
                                                 // This code is contributed by simranarora5sos                       
                                                 </script>                       

输出：

19 is not a multiple of 5

时间复杂性： O（1）

辅助空间： O（1）

多亏darkprince提出了这种方法。如果您发现上述代码/算法不正确，请写下评论，或者寻找其他方法来解决相同的问题。

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