By | 25.03.2017

# C Program to find frequency of vowels in String

Write a C Program to find frequency of vowels in String using Recursion. Here’s simple Program to count vowels in String using Recursion in C Programming Language.

## Recursion : :

• Recursion is the process of repeating items in a self-similar way. In programming languages, if a program allows you to call a function inside the same function, then it is called a recursive call of the function.
• The C programming language supports recursion, i.e., a function to call itself. But while using recursion, programmers need to be careful to define an exit condition from the function, otherwise it will go into an infinite loop.
• Recursive functions are very useful to solve many mathematical problems, such as calculating the factorial of a number, generating Fibonacci series, etc.

Below is the source code for C Program to find frequency of vowels in String using Recursion which is successfully compiled and run on Windows System to produce desired output as shown below :

### SOURCE CODE : :

```/* C Program to find frequency of vowels in String using Recursion*/

#include<stdio.h>
#include<string.h>
int count_vowels(char *str);

int main()
{
char str[100];
printf("Enter any string :: ");
gets(str);
printf("\n Total no. of vowels in String [ %s ] = %d\n",str,count_vowels(str));

return 0;
}
int count_vowels(char *str)
{
if(*str == '\0')
return 0;
switch(*str)
{
case 'A': case 'a':
case 'E': case 'e':
case 'I': case 'i':
case 'O': case 'o':
case 'U': case 'u':
return 1 + count_vowels(str+1);
default:
return count_vowels(str+1);
}
}```

### OUTPUT  : :

```**************** OUTPUT **************

Enter any string :: CodezClub

Total no. of vowels in String [ CodezClub ] = 3```

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