Niven Number

Niven Number is a number which is divisible by sum of it’s digits.

Example 1: 18. 1+8 = 9. We observe that 18 is divisible by sum of it’s digits 9. Hence it is a Niven Number.

Example 2: 15. 1+5 = 6. Here 15 is not divisible by it’s sum of digits 6. Hence it is not a Niven Number.

C
#include <stdio.h>
void main()
{
    int n=0,r=0,s=0,nCopy=0;
    printf("Enter a number: ");
    scanf("%d",&n);
    nCopy=n;
    while(n>0)
    {
        r=n%10;
        s=s+r;
        n=n/10;
    }
    if((nCopy%s)==0)
    {
        printf("%d is a Niven Number",nCopy);
    }
    else
    {
        printf("%d is not a Niven Number",nCopy);
    }
}
C