TypeScript: Check if a Number is Odd or Even

1. Introduction

Determining if a number is odd or even is a fundamental programming task that is often used in a variety of applications. TypeScript, being a superset of JavaScript, provides us with the tools necessary to accomplish this task effectively.

2. Program Overview

This program will contain a function named checkOddEven which will take a number as its parameter. It will return a string stating whether the number is 'Odd' or 'Even'.

3. Code Program

// Define the function with TypeScript type annotations
function checkOddEven(num: number): string {
    if (num % 2 === 0) {
        return 'Even';
    } else {
        return 'Odd';
    }
}

// Test the function
const numberToCheck = 8;
const result = checkOddEven(numberToCheck);
console.log(`${numberToCheck} is an ${result} number.`);

Output:

8 is an Even number.

4. Step By Step Explanation

We use the modulus operator (%) to find the remainder of the division of the number by 2. If a number is divisible by 2 with no remainder (i.e., the remainder is 0), then it's an even number. 

For our example:

8 divided by 2 = 4 with a remainder of 0.

Hence, 8 is an even number.