找出数字中某个数字的频率-yiteyi-C++库

给定一个数字N和一个数字D。编写一个程序，找出数字N中出现数字D的次数。 例如：

null

Input: N = 1122322  ,  D = 2Output: 4Input: N = 346488  ,  D = 9Output: 0

推荐：请尝试你的方法 {IDE} 首先，在进入解决方案之前。

解决这个问题的方法是继续从数字N中提取数字，并用给定的数字D检查提取的数字。如果提取的数字等于数字D，则增加计数。下面是上述方法的实现。

C++

                         // C++ program to find the frequency                       
                         // of a digit in a number                       
                         #include <bits/stdc++.h>                       
                         using                                     namespace                                     std;                       
           
                         // function to find frequency of digit                       
                         // in a number                       
                         int                                     frequencyDigits(                                     int                                     n,                                     int                                     d)                       
                         {                       
                                                 // Counter variable to store                       
                                                 // the frequency                       
                                                 int                                     c = 0;                       
                                   
                                                 // iterate till number reduces to zero                       
                                                 while                                     (n > 0) {                       
                                   
                                                 // check for equality                       
                                                 if                                     (n % 10 == d)                       
                                                 c++;                       
                                                 // reduce the number                       
                                                 n = n / 10;                       
                                                 }                       
                                   
                                                 return                                     c;                       
                         }                       
           
                         // Driver Code                       
                         int                                     main()                       
                         {                       
                                   
                                                 // input number N                       
                                                 int                                     N = 1122322;                       
                                   
                                                 // input digit D                       
                                                 int                                     D = 2;                       
                                   
                                                 cout<<frequencyDigits(N,D);                       
           
                                                 return                                     0;                       
                         }                       

JAVA

                         // Java program to find                       
                         // the frequency of a                       
                         // digit in a number                       
                         class                                     GFG                       
                         {                       
           
                         // function to find frequency                       
                         // of digit in a number                       
                         static                                     int                                     frequencyDigits(                                     int                                     n,                       
                                                 int                                     d)                       
                         {                       
                                                 // Counter variable to                       
                                                 // store the frequency                       
                                                 int                                     c =                                     0                                     ;                       
                                   
                                                 // iterate till number                       
                                                 // reduces to zero                       
                                                 while                                     (n >                                     0                                     )                       
                                                 {                       
                                   
                                                 // check for equality                       
                                                 if                                     (n %                                     10                                     == d)                       
                                                 c++;                       
                                                 // reduce the number                       
                                                 n = n /                                     10                                     ;                       
                                                 }                       
                                                 return                                     c;                       
                         }                       
           
                         // Driver Code                       
                         public                                     static                                     void                                     main(String args[])                       
                         {                       
                                   
                                                 // input number N                       
                                                 int                                     N =                                     1122322                                     ;                       
                                   
                                                 // input digit D                       
                                                 int                                     D =                                     2                                     ;                       
                                   
                                                 System.out.println(frequencyDigits(N, D));                       
                         }                       
                         }                       
           
                         // This code is contributed by Arnab Kundu                       

Python3

                         # Python3 program to find the                       
                         # frequency of a digit in a number                       
           
                         # function to find frequency                       
                         # of digit in a number                       
                         def                                     frequencyDigits(n, d):                       
                                   
                                                 # Counter variable to                       
                                                 # store the frequency                       
                                                 c                                     =                                     0                                     ;                       
                                   
                                                 # iterate till number                       
                                                 # reduces to zero                       
                                                 while                                     (n >                                     0                                     ):                       
                                   
                                                 # check for equality                       
                                                 if                                     (n                                     %                                     10                                     =                                     =                                     d):                       
                                                 c                                     +                                     =                                     1                                     ;                       
                                                 # reduce the number                       
                                                 n                                     =                                     int                                     (n                                     /                                     10                                     );                       
           
                                                 return                                     c;                       
           
                         # Driver Code                       
           
                         # input number N                       
                         N                                     =                                     1122322                                     ;                       
           
                         # input digit D                       
                         D                                     =                                     2                                     ;                       
           
                         print                                     (frequencyDigits(N, D));                       
           
                         # This code is contributed by mits                       

C#

                         // C# program to find the frequency                       
                         // of a digit in a number                       
                         using                                     System;                       
           
                         class                                     GFG                       
                         {                       
           
                         // function to find frequency                       
                         // of digit in a number                       
                         static                                     int                                     frequencyDigits(                                     int                                     n,                       
                                                 int                                     d)                       
                         {                       
                                                 // Counter variable to                       
                                                 // store the frequency                       
                                                 int                                     c = 0;                       
                                   
                                                 // iterate till number                       
                                                 // reduces to zero                       
                                                 while                                     (n > 0)                       
                                                 {                       
                                   
                                                 // check for equality                       
                                                 if                                     (n % 10 == d)                       
                                                 c++;                       
                                                 // reduce the number                       
                                                 n = n / 10;                       
                                                 }                       
                                                 return                                     c;                       
                         }                       
           
                         // Driver Code                       
                         static                                     public                                     void                                     Main(String []args)                       
                         {                       
                                   
                                                 // input number N                       
                                                 int                                     N = 1122322;                       
                                   
                                                 // input digit D                       
                                                 int                                     D = 2;                       
                                   
                                                 Console.WriteLine(frequencyDigits(N, D));                       
           
                         }                       
                         }                       
           
                         // This code is contributed by Arnab Kundu                       

PHP

                         <?php                       
                         // PHP program to find the frequency                       
                         // of a digit in a number                       
           
                         // function to find frequency                       
                         // of digit  in a number                       
                         function                                     frequencyDigits(                                     $n                                     ,                                     $d                                     )                       
                         {                       
                                                 // Counter variable to                       
                                                 // store the frequency                       
                                                 $c                                     = 0;                       
                                   
                                                 // iterate till number                       
                                                 // reduces to zero                       
                                                 while                                     (                                     $n                                     > 0)                       
                                                 {                       
                                   
                                                 // check for equality                       
                                                 if                                     (                                     $n                                     % 10 ==                                     $d                                     )                       
                                                 $c                                     ++;                       
                                                 // reduce the number                       
                                                 $n                                     =                                     $n                                     / 10;                       
                                                 }                       
                                   
                                                 return                                     $c                                     ;                       
                         }                       
           
                         // Driver Code                       
           
                         // input number N                       
                         $N                                     = 1122322;                       
           
                         // input digit D                       
                         $D                                     = 2;                       
           
                         echo                                     frequencyDigits(                                     $N                                     ,                                     $D                                     );                       
           
                         // This code is contributed by mits                       
                         ?>                       

Javascript

                         <script>                       
           
                         // Javascript program to find                       
                         // the frequency of a                       
                         // digit in a number                       
           
                         // Function to find frequency                       
                         // of digit in a number                       
                         function                                     frequencyDigits(n, d)                       
                         {                       
                                   
                                                 // Counter variable to                       
                                                 // store the frequency                       
                                                 var                                     c = 0;                       
                                   
                                                 // Iterate till number                       
                                                 // reduces to zero                       
                                                 while                                     (n > 0)                       
                                                 {                       
                                   
                                                 // Check for equality                       
                                                 if                                     (n % 10 == d)                       
                                                 c++;                       
                                   
                                                 // Reduce the number                       
                                                 n = parseInt(n / 10);                       
                                                 }                       
                                                 return                                     c;                       
                         }                       
           
                         // Driver code                       
           
                         // input number N                       
                         var                                     N = 1122322;                       
           
                         // input digit D                       
                         var                                     D = 2;                       
           
                         document.write(frequencyDigits(N, D));                       
           
                         // This code is contributed by Khushboogoyal499                       
           
                         </script>                       

输出：

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