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.

An integer number which is perfectly divisible by 2 is called even number. For example, 2, 4, 6, 8, .... are even numbers.
An integer number which gives a remainder when divided by 2 is known as an odd number. For example, 3, 5, 7, 9, .... are odd numbers.

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:-

Enter a number: 9
9 is an odd number.
Enter a number: 22
22 is an even number.

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:-

Enter a number: 65
65 is an odd number.
Enter a number: 58
58 is an even number.

You can learn about many other C++ Programs Here.







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Amit Rawat

Amit Rawat

Founder and Developer at SpiderLabWeb
I love to work on new projects and also work on my ideas. My main field of interest is Web Development.

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