Why does not my code work?

Question

Please see my last code called Calculator. Why does not my code work?

Answer 1

It works... in limits of in/output in code playground: you're requested for all required user entries at once at prompt begining, eac separated by a new line...
Try with:

+
40
2
q

Answer 2

Thanks I got it.

Answer 3

next time include language name in tags and add link to your code in post :)

Answer 4

ok