Add variables

Question

I want to add two variables but I am unable I put the add sign between variables but the don't add up simply they are written here is the code you can see
https://code.sololearn.com/Wl3lRhhh73Xl/?ref=app

Answer 1

Prompt returns a string ,and usuage of "+" on strings concatenates them ,instead cast the result to int and then perform addition ,
w=parseInt(prompt())

Answer 2

Input return you data in string form that why + is acting as concatinator.

For maths do it as

var c = parseInt(w)+parseInt(y);

Answer 3

The problem solved thanks to both

Answer 4

ParseInt is not defined