#include<stdio.h>
#include<string.h>

int countVowels(char str[]);

int main() {
    char str[]="Hello World";
    printf("vowels are :%d",countVowels(str));
}

int countVowels(char str[]) {
    int count=0;

    for(int i=0; str[i] !='\0'; i++) {
        if(str[i] =='a' || str[i]=='e' || str[i]=='i' || str[i]=='o' || str[i]=='u'){
            count++;
        }
    }
    return count;
}