Code playground

Question

https://code.sololearn.com/cDflA63XHIu8/?ref=app
This code worked on my laptop but not here, why?

Answer 1

codeplayground is restrictive, that's probably why

Answer 2

Do you enter both numbers and the operation after or in between the numbers? Slightly confused how it the calculator works. Also, line 10 says "pintln" instead of println.

Answer 3

in between the numbers