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

In this example, if...else statement is used to check whether a number entered by the user is even or odd.
To understand this example, you should have the knowledge of following C++ programming topics:
  • C++ if, if...else and Nested if...else
Integers which are perfectly divisible by 2 are called even numbers.
And those integers which are not perfectly divisible by 2 are not known as odd number.
To check whether an integer is even or odd, the remainder is calculated when it is divided by 2 using modulus operator %. If remainder is zero, that integer is even if not that integer is odd. Read More C++

Example 1: Check Whether Number is Even or Odd using if else

#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.
In this program, if..else statement is used to check whether n%2 == 0 is true or not. If this expression is true, n is even if not n is odd.
You can also use ternary operators ?: instead of if..else statement. Ternary operator is short hand notation of if...else statement.
Also Check:

Example 2: Check Whether Number is Even or Odd using ternary operators

#include <iostream>
using namespace std;

int main()
{
    int n;

    cout << "Enter an integer: ";
    cin >> n;
    
    (n % 2 == 0) ? cout << n << " is even." :  cout << n << " is odd.";
    
    return 0;
}

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