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how to use modulus function in c program?

1.      The modulus operator is useful in a variety of circumstances. It is commonly used to take a randomly generated number and reduce that number to a random number on a smaller range, and it can also quickly tell you if one number is a factor of another. 

If you wanted to know if a number was odd or even, you could use modulus to quickly tell you by asking for the remainder of the number when divided by 2.

#include <iostream>

using namespace std;

int main()

{

    int num;

    cin >> num;

    // num % 2 computes the remainder when num is divided by 2

    if ( num % 2 == 0 )

    {

        cout << num << " is even ";

    }

    return 0;

}