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

Posted by admin January 5, 2023

Source Code

#include <iostream>

using namespace std;

int main()
{
    int num; // Declare a variable to hold the number

    cout << "Enter a number: "; // Prompt the user to enter a number
    cin >> num; // Read the number from the standard input stream

    if (num % 2 == 0) // Check if the number is even
        cout << num << " is even" << endl; // Print "even" if the number is even
    else
        cout << num << " is odd" << endl; // Print "odd" if the number is odd

    return 0;
}

Code Explanation

This program declares a variable num of type int to hold the number entered by the user. It then uses the cout object to print a prompt asking the user to enter a number, and the cin object to read the number from the standard input stream.

To check if the number is even, the program uses the modulo operator % to find the remainder when num is divided by 2. If the remainder is 0, the number is even (since it is divisible by 2). If the remainder is not 0, the number is odd.

The program uses an if statement to check the value of the remainder and print the appropriate message using the cout object.

What is if-else statment?

In C++, the if-else statement is a control flow statement that allows you to execute a block of code conditionally. It has the following syntax:

if (expression)
{
    // code to execute if expression is true
}
else
{
    // code to execute if expression is false
}

The if clause specifies a condition, and the code inside the {} brackets following the if clause is executed if the condition is true. The else clause specifies an alternative block of code to execute if the condition is false.

For example, consider the following code:

int num = 5;

if (num > 0)
{
    cout << "num is positive" << endl;
}
else
{
    cout << "num is negative or zero" << endl;
}

In this example, the condition num > 0 is evaluated as true, so the code inside the if clause is executed, and the program prints "num is positive" to the standard output stream.

If the value of num were negative or zero, the condition would be false, and the code inside the else clause would be executed, printing "num is negative or zero" to the output stream.

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