cannot use + when try to add number

Question

After i selected option 1 and after i add the number like 100 it results like this 100100

This is the code:

var userAmount;
    var userMoney = 100;
         


        

Answer 1

You need to cast your values to integers first. Try using parseInt()

change:

var totalMoney = userMoney + userAmount;

to this:

var totalMoney = parseInt(userMoney, 10) + parseInt(userAmount, 10);