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

In this program, we will learn how to check whether a number is even or odd using C++ programming language.

We will discuss two ways

1. Using Modulus operator ( % )
2. Using Bitwise operator ( & )

Let's discuss them one by one.

Check whether a number is even or odd

Using modulus operator ( % )

In the below code, the variable num is divided by 2 and its remainder is compared. If the remainder is 0, then the number is even. If the remainder is 1, then the number is odd.

Code:-

#include <iostream>

using namespace std;

int main(){
    int num;

    cout << "Enter a number: ";
    cin >> num;

    if ( num % 2 == 0)
        cout << num << " is an even number." << endl;
    else
        cout << num << " is an odd number." << endl;

    return 0;
}

Output:-

Using Bitwise operator ( & )

A number is odd if it has 1 as its rightmost bit in bitwise representation. And it is even if it has 0 as its rightmost bit in bitwise representation. This can be found by using bitwise AND (&) operator on the number and 1. If it gives 0, then the number is even and if it gives 1, then the number is odd.

Code:-

#include <iostream>

using namespace std;

int main(){
    int num;

    cout << "Enter a number: ";
    cin >> num;

    if ( (num & 1) == 0)
        cout << num << " is an even number." << endl;
    else
        cout << num << " is an odd number." << endl;

    return 0;
}

Output:-