What have I done...?

Question

Can anyone help me understand what I did wrong here? Everything works except for addition.
https://code.sololearn.com/W3ELnpp0t5Gy/?ref=app

Answer 1

The values you receive from prompt() are Strings. So, when adding together two Strings: "3" + "5", the result is: "35" rather than 8.

Convert the variables x and y (which are supposed to represent numbers) to integers.
You can do this with the parseInt() function.

Fixed code:

var x = parseInt(prompt("Insert first number"));
var z = prompt("Choose operator(+,-,*,/)");
var y = parseInt(prompt("Insert second number"));

Answer 2

I assume the operators /, - and * try to convert the String to a number. Probably because there is no other use for those operators. Adding on the other hand can be used for both numbers and Strings.

Answer 3

Yep, with strings, + is usually used to concatenate two values together. Eg in your code you have this: the plus is concatenating "The sum is " with the value of a.

case'+':document.write("The sum is " + a);

Answer 4

@Rrestoring faith Awesome thank you! How did it end up only affecting the addition variable though? O.o

Answer 5

@Rrestoring faith ahhhh ok that makes sense