#include <stdio.h>


int loopnum(int n);

int
main(void)
{
    int num;
    int sum = 0;
    int d = loopnum(num);

    printf("Enter a number:n");
    scanf("%d", &num);

    while(loopnum(num) > 0)
    {
            printf("d = %d", d);
            printf(",sum = %dn",sum);

    }


    if(num % 9 == 0)
    {
    printf("n = %d is divisible by 9n", num);
    }
    else
    {
    printf("n = %d is not divisible by 9n", num);
    }
    return 0;
}

 int
 loopnum(int n)
{

    n  = n % 10;
    n = n / 10;

    return n;

}


 Enter a number:
 9
 n = 9 is divisible by 9

 The result of this code is suppose to output d = "the digit" ,sum =
 "digit + sum" and n = "digit" is divisible by 9. for example if I
 input 9. The output would be d = 9, sum = 9.