Input a number and check if it is a Niven (Harshad) number or not using a function in C

Function - Question 9

Q9) Write a program in C to input a number and check if it is a Niven (Harshad) number or not using a function. The function should return 1 if the numbers is a Niven number else return 0.

A Niven number is an integer number that is divisible by the sum of its digits.

Example: 18 is a Niven number because the sum of its digit is 9 and 18 is divisible by 9.

#include <stdio.h>
#include <conio.h>

int niven(int num)
{
    int s=0,t,d;
    t=num;

    while(t>0)
    {
        d=t%10;
        s=s+d;     // sum of the digits
        t=t/10;
    }

    if(num%s==0)
    {
        return 1;
    }
    return 0;
}

int main()
{
    int n;
    printf("Enter a number ");
    scanf("%d",&n);
    if(niven(n)==1)
    {
        printf("Niven Number");
    }
    else
    {
        printf("Not Niven Number");
    }
    return 0;
}

Enter a number 18
Niven Number