How to Find the Cube of a Number Using JavaScript

In this post, we’ll explore a simple mathematical problem: finding the cube of a number. This is a beginner-friendly task, great for understanding basic input/output and arithmetic operations in JavaScript.

Problem Statement

You are given a single positive integer N.

Input:

A single line containing a positive integer N.

Output:

A single line containing the cube of N (i.e., N × N × N or N³).

Sample

Input:

2

Output:

8

Why?
Because: 2 × 2 × 2 = 8

Step-by-Step Explanation

Here’s how you should approach this:

1. Read the input number.
   
2. Calculate the cube using multiplication or the exponentiation operator (**).
   
3. Print the result.

JavaScript Solution (Node.js / Coding Platforms)

Here’s a basic JavaScript script that does exactly that:

How the Code Works

• We use Node.js’s readline module to accept input.
  
• The user enters a number (say 2).
  
• parseInt(line) ensures the input is treated as a number, not a string.
  
• N ** 3 calculates the cube of N.
  
• Finally, we print the result using console.log().
  

Note: The exponentiation operator in JavaScript. You could also use Math.pow(N, 3) if preferred.

Summary

This problem is great for practicing:

• Reading input
  
• Doing basic arithmetic
  
• Outputting results

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Conclusion

Finding the cube of a number is a simple yet effective exercise for beginners to get comfortable with basic input/output handling and arithmetic operations in JavaScript. In this problem, we learned how to:

• Read user input using Node.js (readline module)
  
• Convert input strings to numbers using parseInt
  
• Use exponentiation (**) to calculate the cube
  
• Display the result with console.log