C++ Program to Check Whether Number is Even or Odd.

#include <iostream>

using namespace std;

int main() {

    int n;

    cout << "Enter an integer: ";

    cin >> n;

    if ( n%2 == 0) {

        cout << n << " is even.";

    }

    else {

        cout << n << " is odd.";

    }

    return 0;

}

Output

Enter an integer: 23

23 is odd.