Programming Mania

#include<stdio.h>

int count_vowels(char []);

int check_vowel(char);

main()

{

   char array[100];

   int c;

   printf("Enter a string\n");

   gets(array);

   c = count_vowels(array);

   printf("Number of vowels: %d\n", c);

   return 0;

}

int count_vowels(char a[])

{

   int count = 0, c = 0, flag;

   char d;

   do

   {   

      d = a[c];

      flag = check_vowel(d);

      if ( flag == 1 )

         count++;

      c++;

   }while( d != '\0' );

   return count;

}

int check_vowel(char a)

{

   if ( a >= 'A' && a <= 'Z' )

      a = a + 'a' - 'A';   /* Converting to lower case */

   if ( a == 'a' || a == 'e' || a == 'i' || a == 'o' || a == 'u')

      return 1;

   return 0;

}