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

###### Function - Question 9

In this question, we will see how to input a number and check if it is a Niven (Harshad) number or not in C programming using a function. To know more about function click on the function lesson.

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.

#### Program

``````#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;
}``````

#### Output

```Enter a number 18
Niven Number```