Calculation

Question

I am trying to add totalAmount + tipAmount, but the code is treating the variables as a string rather than as a numerical value. How would I correct this?

Ie: 100 + 20 currently = 10020, but I want it to show 120

var totalAmount = prompt ("Enter total amount billed")

var tipAmount = prompt ("Enter tip amount")

document.write (totalAmount + tipAmount);

Answer 1

A. Quick answer

parseInt(var)
or
parseFloat(var)
or
Number(var)

B. demo
https://code.sololearn.com/WhheW2KGJl8F/?ref=app

C. Explanation

the + operator can be Number.addition or String.concantenation.

D. There is a difference between parseInt and Number, read:

https://www.sololearn.com/post/115762/?ref=app

https://code.sololearn.com/WKKkpq0efxai/?ref=app

Answer 2

Here in this case, you can use parseInt which is an inbuilt function in JavaScript which converts a String into an integer value.
You can read here more about it : https://www.geeksforgeeks.org/javascript-parseint-with-examples/

After taking prompt input you can convert it into integer as it take integer input.
totalAmount = parseInt(totalAmount);
Same applies for tipAmount.

Answer 3

thank you!