JavaScript Program to Find the Largest Among Three Numbers

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Introduction

In many programming scenarios, it's essential to compare multiple values and determine which is the largest. This task involves finding the largest number from three provided numbers using basic comparison operators in JavaScript.

Problem Statement

Create a JavaScript program that:

  • Accepts three numbers.
  • Determines which of the three numbers is the largest.
  • Returns and displays the largest number.

Example:

  • Input: 5, 10, 15

  • Output: 15 is the largest number

  • Input: -7, 0, -3

  • Output: 0 is the largest number

Solution Steps

  1. Read the Input Numbers: Provide three numbers either as part of user input or directly within the code.
  2. Compare the Numbers: Use basic conditional logic (if-else statements) to compare the three numbers and identify the largest.
  3. Display the Result: Print the largest number.

JavaScript Program

// JavaScript Program to Find the Largest Among Three Numbers
// Author: https://www.javaguides.net/

function findLargestNumber(num1, num2, num3) {
    let largest;

    // Step 1: Compare the three numbers
    if (num1 >= num2 && num1 >= num3) {
        largest = num1;
    } else if (num2 >= num1 && num2 >= num3) {
        largest = num2;
    } else {
        largest = num3;
    }

    // Step 2: Display the result
    console.log(`${largest} is the largest number`);
}

// Example input
let number1 = 5;
let number2 = 10;
let number3 = 15;
findLargestNumber(number1, number2, number3);

Output

15 is the largest number

Example with Different Input

let number1 = -7;
let number2 = 0;
let number3 = -3;
findLargestNumber(number1, number2, number3);

Output:

0 is the largest number

Explanation

Step 1: Compare the Three Numbers

  • The function findLargestNumber() compares three numbers using if-else statements.
    • First, it checks if num1 is greater than or equal to both num2 and num3.
    • If not, it checks if num2 is greater than or equal to both num1 and num3.
    • If both conditions fail, num3 is considered the largest.

Step 2: Display the Result

  • The largest number is stored in the variable largest and displayed using console.log().

Conclusion

This JavaScript program demonstrates how to find the largest number among three given numbers using comparison operators. This approach is essential in scenarios where comparisons need to be made between multiple values. By understanding how to implement conditional logic, you can extend this program to compare even more numbers or add more complex conditions.

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