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Exercise 3

Write a program that uses a multiply function to multiply two numbers and returns the result. Ask the user to enter the two numbers, then output the numbers and result as a simple equation.

$ node multiply.js
Enter the first number: 3.141592653589793
Enter the second number: 2.718281828459045
3.141592653589793 * 2.718281828459045 = 8.539734222673566

Solution

function multiply(left, right) {
  return left * right;
}

function getNumber(prompt) {
  let readlineSync = require('readline-sync');
  return parseFloat(readlineSync.question(prompt));
}

let left = getNumber('Enter the first number: ');
let right = getNumber('Enter the second number: ');
console.log(`${left} * ${right} = ${multiply(left, right)}`);

Video Walkthrough

You might have written a solution that doesn’t convert the user’s input from a string to a number. While this works due to JavaScript’s implicit type coercion, it's best to avoid relying on it. When performing arithmetic, you should explicitly convert values to numbers to ensure clarity and prevent unexpected behavior.

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