All test cases are not getting pass for basic calculator

I think my logic is correct and i have tried all passible inputs and it is giving correct answers also.
But don’t know why code is not passing all test cases.
Please look into the code.Please help.

I have edited your code… Try to submit now…

Thank you.It got submitted.

Pls mark this as resolved… if you were able to submit it…

Can you please tell me, from where to mark it as resolved.I am unable to see option to update status of my doubts.It’s first time i have posted doubt on it.

Ok, no prob. I will mark it as resolved then.