JavaScript Program to Check if a Number is Even or Odd

Introduction

Determining whether a number is even or odd is a basic and common operation in programming. A number is even if it is divisible by 2 with no remainder and odd if it leaves a remainder of 1 when divided by 2. This program will help check if a given number is even or odd.

Problem Statement

Create a JavaScript program that:

• Accepts a number.
• Checks whether the number is even or odd.
• Displays the result indicating if the number is even or odd.

Example:

• Input: 12

• Output: 12 is an even number

• Input: 7

• Output: 7 is an odd number

Solution Steps

1. Read the Input Number: Accept the number either from user input or directly within the code.
2. Check Even or Odd: Use the modulus operator (%) to determine if the number is divisible by 2.
3. Display the Result: Print whether the number is even or odd based on the result.

JavaScript Program

// JavaScript Program to Check if a Number is Even or Odd
// Author: https://www.javaguides.net/

function checkEvenOrOdd(number) {
    // Step 1: Check if the number is even or odd
    if (number % 2 === 0) {
        console.log(`${number} is an even number`);
    } else {
        console.log(`${number} is an odd number`);
    }
}

// Example input
let inputNumber = 12;
checkEvenOrOdd(inputNumber);

Output

12 is an even number

Example with Different Input

let inputNumber = 7;
checkEvenOrOdd(inputNumber);

Output:

7 is an odd number

Explanation

Step 1: Check if the Number is Even or Odd

• The number is passed to the checkEvenOrOdd() function. The modulus operator (%) checks if there is any remainder when the number is divided by 2. If no remainder is left (number % 2 === 0), the number is even; otherwise, it is odd.

Step 2: Display the Result

• The result is printed using console.log(), specifying whether the number is even or odd.

Conclusion

This JavaScript program demonstrates how to check whether a number is even or odd using the modulus (%) operator. This simple task is essential for various logic operations in programming, helping developers handle conditional checks based on numerical properties.