Question

Write a while loop in JavaScript to add two numbers from user input and display the sum.

Answer 1

JavaScript while loop can be used to add two user-provided numbers by prompting the input, summing them up inside the loop, and then displaying the sum.

Step-by-step explanation:

To add two numbers using a while loop in JavaScript, you can prompt the user for input, convert the input strings to numbers, and calculate their sum inside the loop. Here's how you can write it:

let sum=0, counter=0;
while(counter<2){
let numberToAdd = parseFloat(prompt('Enter a number to add: '));
sum += numberToAdd;
counter++;
}
alert('The sum of the two numbers is: ' + sum);
In this example, the loop continues to prompt the user for the first and second numbers until valid numbers are entered. The parseInt() function is used to convert the input strings to numbers. The sum is then calculated and displayed using the alert() function.

This code snippet uses a while loop to add numbers from user input. The sum is displayed after two numbers are entered and added. The principles of addition apply here, showing that the order of numbers doesn't change the sum, following the commutative property of addition.