Program to Find Vowels in a String 

#include <stdio.h>

#include <string.h>

main()

{

char str[20];

int count=0, i=0;

printf("\nEnter any string: ");

gets(str);

while (str[i] != '\0')

{

if (str[i]=='a' || str[i]=='e' || str[i]=='i' ||

str[i]=='o' || str[i]=='u')

count++;

i++;

}

printf("\nNo. of vowels: %d", count);

getch();