Showing Compilation error

Question

add subtract program
https://code.sololearn.com/c0HDq6fE60xN/?ref=app

Answer 1

In line 6, you wrote String with a small s.
Besides, for a simple addition and subtraction program, this seems way too complex. I'll show you how I would do it within the next hour :)

Answer 2

multiple inputs are not supported I think!

Answer 3

Help

Answer 4

is the written​ code right?

Answer 5

ok, please