aeiou using *ptr

    #include <stdio.h>
    #define size 10
    void swap(char *arr, int *k)
    {    int i=0;
        while( *(arr+i) != '\0'){
             if (*(arr + i) == 'a' || *(arr + i) == 'e' || *(arr + i) == 'i' || *(arr + i) == 'o' || *(arr + i) == 'u')
            (*k)++;
            i++;
            }
        printf("# of vowels is %d", *k);

    }

    int main()
    {
    char arr[size];
    int k=0;
    puts("Enter a string");
    scanf("%s", arr);
    swap(arr,&k);

    }