Even number

Even numbers are numbers that have a difference of 2 unit or number. In other words, if the number is completely divisible by 2 then it is an even number.

Odd number

Opposite of even numbers, odd numbers are having a difference of 3 unit or number. In other words, if the number is not completely divisible by 2 then it is an odd number.

Logic

To find if a number is even or odd we only need to check if the given number is multiple of 2 or not, If it is multiple of 2 that means it is even number otherwise an odd number.

To check if it is multiple of 2 or not we use modulus operator.

If the expression number % 2 returns 0 that means the number is a multiple of 2. In other words, it is completely divisible by 2.

Program

#include <iostream>

using namespace std;

int main() {

    int number;

    cout << "Enter an integer : ";
    cin >> number;

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

    return 0;
}

Output

Enter an integer : 886
886 is even number.