计算字符串中元音的程序（迭代和递归）-yiteyi-C++库

给定一个字符串，计算其中元音（a、e、i、o、u）的总数。有两种方法可以计算字符串中元音的总数。 1.迭代 2.递归 例如：

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Input : abc deOutput : 2Input : geeksforgeeks portalOutput : 7

建议：请在“上解决” 实践 “首先，在讨论解决方案之前。

1.迭代法 以下是实施情况：

C++

                         // C++ program to count vowels in a string                       
                         #include<iostream>                       
                         using                                     namespace                                     std;                       
           
                         // Function to check the Vowel                       
                         bool                                     isVowel(                                     char                                     ch)                       
                         {                       
                                                 ch =                                     toupper                                     (ch);                       
                                                 return                                     (ch==                                     'A'                                     || ch==                                     'E'                                     || ch==                                     'I'                                     ||                       
                                                 ch==                                     'O'                                     || ch==                                     'U'                                     );                       
                         }                       
           
                         // Returns count of vowels in str                       
                         int                                     countVowels(string str)                       
                         {                       
                                                 int                                     count = 0;                       
                                                 for                                     (                                     int                                     i=0; i<str.length(); i++)                       
                                                 if                                     (isVowel(str[i]))                                     // Check for vowel                       
                                                 ++count;                       
                                                 return                                     count;                       
                         }                       
           
                         // Main Calling Function                       
                         int                                     main()                       
                         {                       
                                                 //string object                       
                                                 string str =                                     "abc de"                                     ;                       
           
                                                 // Total numbers of Vowel                       
                                                 cout << countVowels(str) << endl;                       
                                                 return                                     0;                       
                         }                       

JAVA

                         // Java program to count vowels in a string                       
                         public                                     class                                     GFG {                       
                                   
                                                 // Function to check the Vowel                       
                                                 static                                     boolean                                     isVowel(                                     char                                     ch)                       
                                                 {                       
                                                 ch = Character.toUpperCase(ch);                       
                                                 return                                     (ch==                                     'A'                                     || ch==                                     'E'                                     || ch==                                     'I'                                     ||                       
                                                 ch==                                     'O'                                     || ch==                                     'U'                                     );                       
                                                 }                       
                                   
                                                 // Returns count of vowels in str                       
                                                 static                                     int                                     countVowels(String str)                       
                                                 {                       
                                                 int                                     count =                                     0                                     ;                       
                                                 for                                     (                                     int                                     i =                                     0                                     ; i < str.length(); i++)                       
                                                 if                                     (isVowel(str.charAt(i)))                                     // Check for vowel                       
                                                 ++count;                       
                                                 return                                     count;                       
                                                 }                       
                                   
                                                 // Driver code                       
                                                 public                                     static                                     void                                     main(String args[])                       
                                                 {                       
                                                 //string object                       
                                                 String str =                                     "abc de"                                     ;                       
                                   
                                                 // Total numbers of Vowel                       
                                                 System.out.println(countVowels(str));                       
                                                 }                       
                         }                       
                         // This code is contributed by Sumit Ghosh                       

Python3

                         # Python3 program to count vowels                       
                         # in a string                       
           
                         # Function to check the Vowel                       
                         def                                     isVowel(ch):                       
                                                 return                                     ch.upper()                                     in                                     [                                     'A'                                     ,                                     'E'                                     ,                                     'I'                                     ,                                     'O'                                     ,                                     'U'                                     ]                       
           
                         # Returns count of vowels in str                       
                         def                                     countVowels(                                     str                                     ):                       
                                                 count                                     =                                     0                       
                                                 for                                     i                                     in                                     range                                     (                                     len                                     (                                     str                                     )):                       
           
                                                 # Check for vowel                       
                                                 if                                     isVowel(                                     str                                     [i]):                       
                                                 count                                     +                                     =                                     1                       
                                                 return                                     count                       
           
                         # Driver Code                       
           
                         # string object                       
                         str                                     =                                     'abc de'                       
           
                         # Total number of Vowels                       
                         print                                     (countVowels(                                     str                                     ))                       
           
                         # This code is contributed                       
                         # by SamyuktaSHegde                       

C#

                         // C# program to count vowels in a string                       
                         using                                     System;                       
           
                         class                                     GFG                       
                         {                       
           
                                                 // Function to check the Vowel                       
                                                 public                                     static                                     bool                                     isVowel(                                     char                                     ch)                       
                                                 {                       
                                                 ch =                                     char                                     .ToUpper(ch);                       
                                                 return                                     (ch ==                                     'A'                                     || ch ==                                     'E'                                     ||                       
                                                 ch ==                                     'I'                                     || ch ==                                     'O'                                     ||                       
                                                 ch ==                                     'U'                                     );                       
                                                 }                       
           
                                                 // Returns count of vowels in str                       
                                                 public                                     static                                     int                                     countVowels(                                     string                                     str)                       
                                                 {                       
                                                 int                                     count = 0;                       
                                                 for                                     (                                     int                                     i = 0; i < str.Length; i++)                       
                                                 {                       
                                   
                                                 // Check for vowel                       
                                                 if                                     (isVowel(str[i]))                       
                                                 {                       
                                                 ++count;                       
                                                 }                       
                                                 }                       
                                                 return                                     count;                       
                                                 }                       
           
                                                 // Driver code                       
                                                 public                                     static                                     void                                     Main(                                     string                                     [] args)                       
                                                 {                       
                                   
                                                 //string object                       
                                                 string                                     str =                                     "abc de"                                     ;                       
           
                                                 // Total numbers of Vowel                       
                                                 Console.WriteLine(countVowels(str));                       
                                                 }                       
                         }                       
           
                         // This code is contributed by Shrikant13                       

PHP

                         <?php                       
                         // PHP program to count vowels in a string                       
           
                         // Function to check the Vowel                       
                         function                                     isVowel(                                     $ch                                     )                       
                         {                       
                                                 $ch                                     =                                     strtoupper                                     (                                     $ch                                     );                       
                                                 return                                     (                                     $ch                                     ==                                     'A'                                     ||                                     $ch                                     ==                                     'E'                                     ||                       
                                                 $ch                                     ==                                     'I'                                     ||                                     $ch                                     ==                                     'O'                                     ||                       
                                                 $ch                                     ==                                     'U'                                     );                       
                         }                       
           
                         // Returns count of vowels in str                       
                         function                                     countVowels(                                     $str                                     )                       
                         {                       
                                                 $count                                     = 0;                       
                                                 for                                     (                                     $i                                     = 0;                                     $i                                     <                                     strlen                                     (                                     $str                                     );                                     $i                                     ++)                       
                                                 if                                     (isVowel(                                     $str                                     [                                     $i                                     ]))                                     // Check for vowel                       
                                                 ++                                     $count                                     ;                       
                                                 return                                     $count                                     ;                       
                         }                       
           
                         // Driver Code                       
           
                         //string object                       
                         $str                                     =                                     "abc de"                                     ;                       
           
                         // Total numbers of Vowel                       
                         echo                                     countVowels(                                     $str                                     ) .                                     ""                                     ;                       
           
                         // This code is contributed                       
                         // by Akanksha Rai                       
                         ?>                       

Javascript

                         <script>                       
                                                 // JavaScript program to count vowels in a string                       
           
                                                 // Function to check the Vowel                       
                                                 function                                     isVowel(ch) {                       
                                                 ch = ch.toUpperCase();                       
                                                 return                                     ch ==                                     "A"                                     || ch ==                                     "E"                                     || ch ==                                     "I"                                     || ch ==                                     "O"                                     || ch ==                                     "U"                                     ;                       
                                                 }                       
           
                                                 // Returns count of vowels in str                       
                                                 function                                     countVowels(str)                       
                                                 {                       
                                                 var                                     count = 0;                       
                                                 for                                     (                                     var                                     i = 0; i < str.length; i++)                       
                                                 if                                     (isVowel(str[i]))                       
                                   
                                                 // Check for vowel                       
                                                 ++count;                       
                                                 return                                     count;                       
                                                 }                       
           
                                                 // Main Calling Function                       
           
                                                 // string object                       
                                                 var                                     str =                                     "abc de"                                     ;                       
           
                                                 // Total numbers of Vowel                       
                                                 document.write(countVowels(str));                       
                                                 document.write(                                     "<br>"                                     );                       
                                   
                                                 // This code is contributed by rdtank.                       
                                                 </script>                       

输出：

建议：请在“上解决” 实践 “首先，在讨论解决方案之前。

2.递归法 以下是实施情况：

C++

                         // Recursive C++ program to count the total                       
                         // number of vowels using recursion                       
                         #include<iostream>                       
                         using                                     namespace                                     std;                       
           
                         // Function to check the Vowel                       
                         bool                                     isVowel(                                     char                                     ch)                       
                         {                       
                                                 ch =                                     toupper                                     (ch);                       
                                                 return                                     (ch==                                     'A'                                     || ch==                                     'E'                                     || ch==                                     'I'                                     ||                       
                                                 ch==                                     'O'                                     || ch==                                     'U'                                     );                       
                         }                       
           
                         // to count total number of vowel from 0 to n                       
                         int                                     countVovels(string str,                                     int                                     n)                       
                         {                       
                                                 if                                     (n == 1)                       
                                                 return                                     isVowel(str[n-1]);                       
           
                                                 return                                     countVovels(str, n-1) + isVowel(str[n-1]);                       
                         }                       
           
                         // Main Calling Function                       
                         int                                     main()                       
                         {                       
                                                 // string object                       
                                                 string str =                                     "abc de"                                     ;                       
           
                                                 // Total numbers of Vowel                       
                                                 cout << countVovels(str, str.length()) << endl;                       
                                                 return                                     0;                       
                         }                       

JAVA

                         // Recursive Java program to count the total                       
                         // number of vowels using recursion                       
                         public                                     class                                     GFG {                       
                                   
                                                 // Function to check the Vowel                       
                                                 static                                     int                                     isVowel(                                     char                                     ch)                       
                                                 {                       
                                                 ch = Character.toUpperCase(ch);                       
                                                 if                                     (ch==                                     'A'                                     || ch==                                     'E'                                     || ch==                                     'I'                                     ||                       
                                                 ch==                                     'O'                                     || ch==                                     'U'                                     )                       
                                                 return                                     1                                     ;                       
                                                 else                                     return                                     0                                     ;                       
                                                 }                       
                                   
                                                 // to count total number of vowel from 0 to n                       
                                                 static                                     int                                     countVowels(String str,                                     int                                     n)                       
                                                 {                       
                                                 if                                     (n ==                                     1                                     )                       
                                                 return                                     isVowel(str.charAt(n -                                     1                                     ));                       
                                   
                                                 return                                     countVowels(str, n-                                     1                                     ) + isVowel(str.charAt(n -                                     1                                     ));                       
                                                 }                       
                                   
                                                 // Main Calling Function                       
                                                 public                                     static                                     void                                     main(String args[])                       
                                                 {                       
                                                 //string object                       
                                                 String str =                                     "abc de"                                     ;                       
                                   
                                                 // Total numbers of Vowel                       
                                                 System.out.println(countVowels(str,str.length()));                       
                                                 }                       
                         }                       
                         // This code is contributed by Sumit Ghosh                       

Python 3

                         # Recursive Python 3 program to count the                       
                         # total number of vowels using recursion                       
           
                         # Function to check the Vowel                       
                         def                                     isVowel(ch):                       
                                                 return                                     ch.upper()                                     in                                     [                                     'A'                                     ,                                     'E'                                     ,                                     'I'                                     ,                                     'O'                                     ,                                     'U'                                     ]                       
           
                         # to count total number of                       
                         # vowel from 0 to n                       
                         def                                     countVovels(                                     str                                     , n):                       
                                                 if                                     (n                                     =                                     =                                     1                                     ):                       
                                                 return                                     isVowel(                                     str                                     [n                                     -                                     1                                     ]);                       
           
                                                 return                                     (countVovels(                                     str                                     , n                                     -                                     1                                     )                                     +                       
                                                 isVowel(                                     str                                     [n                                     -                                     1                                     ]));                       
           
                         # Driver Code                       
           
                         # string object                       
                         str                                     =                                     "abc de"                                     ;                       
           
                         # Total numbers of Vowel                       
                         print                                     (countVovels(                                     str                                     ,                                     len                                     (                                     str                                     )))                       
           
                         # This code is contributed                       
                         # by Akanksha Rai                       

C#

                         using                                     System;                       
           
                         // Recursive C# program to count the total                       
                         // number of vowels using recursion                       
                         public                                     class                                     GFG                       
                         {                       
           
                                                 // Function to check the Vowel                       
                                                 public                                     static                                     int                                     isVowel(                                     char                                     ch)                       
                                                 {                       
                                                 ch =                                     char                                     .ToUpper(ch);                       
                                                 if                                     (ch ==                                     'A'                                     || ch ==                                     'E'                                     || ch ==                                     'I'                                     || ch ==                                     'O'                                     || ch ==                                     'U'                                     )                       
                                                 {                       
                                                 return                                     1;                       
                                                 }                       
                                                 else                       
                                                 {                       
                                                 return                                     0;                       
                                                 }                       
                                                 }                       
           
                                                 // to count total number of vowel from 0 to n                       
                                                 public                                     static                                     int                                     countVowels(                                     string                                     str,                                     int                                     n)                       
                                                 {                       
                                                 if                                     (n == 1)                       
                                                 {                       
                                                 return                                     isVowel(str[n - 1]);                       
                                                 }                       
           
                                                 return                                     countVowels(str, n - 1) + isVowel(str[n - 1]);                       
                                                 }                       
           
                                                 // Main Calling Function                       
                                                 public                                     static                                     void                                     Main(                                     string                                     [] args)                       
                                                 {                       
                                                 //string object                       
                                                 string                                     str =                                     "abc de"                                     ;                       
           
                                                 // Total numbers of Vowel                       
                                                 Console.WriteLine(countVowels(str,str.Length));                       
                                                 }                       
                         }                       
           
                         // This code is contributed by Shrikant13                       

PHP

                         <?php                       
                         // Recursive PHP program to count the total                       
                         // number of vowels using recursion                       
           
                         // Function to check the Vowel                       
                         function                                     isVowel(                                     $ch                                     )                       
                         {                       
                                                 $ch                                     =                                     strtoupper                                     (                                     $ch                                     );                       
                                                 return                                     (                                     $ch                                     ==                                     'A'                                     ||                                     $ch                                     ==                                     'E'                                     ||                       
                                                 $ch                                     ==                                     'I'                                     ||                                     $ch                                     ==                                     'O'                                     ||                       
                                                 $ch                                     ==                                     'U'                                     );                       
                         }                       
           
                         // to count total number of                       
                         // vowel from 0 to n                       
                         function                                     countVovels(                                     $str                                     ,                                     $n                                     )                       
                         {                       
                                                 if                                     (                                     $n                                     == 1)                       
                                                 return                                     isVowel(                                     $str                                     [                                     $n                                     - 1]);                       
           
                                                 return                                     countVovels(                                     $str                                     ,                                     $n                                     - 1) +                       
                                                 isVowel(                                     $str                                     [                                     $n                                     - 1]);                       
                         }                       
           
                         // Driver Code                       
           
                         // string object                       
                         $str                                     =                                     "abc de"                                     ;                       
           
                         // Total numbers of Vowel                       
                         echo                                     countVovels(                                     $str                                     ,                                     strlen                                     (                                     $str                                     )) .                                     ""                                     ;                       
           
                         // This code is contributed                       
                         // by Akanksha Rai                       
                         ?>                       

输出：

递归代码是如何工作的。。

图片[1]-计算字符串中元音的程序（迭代和递归）-yiteyi-C++库

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