Pls help with error in c# can't convert string to int

Question

I got an error 'can't convert string to int' but string is number. What to do? Help pls.
https://sololearn.com/compiler-playground/cs4Q56FCueFX/?ref=app My code.

Answer 1

I agree with NB‎. output was declared as int, but in line 48 you are assigning a string to it.
yes, directly print the result. No need for the ouput variable.
also, you have mixed up and duplicated cases.

Answer 2

NB, Bob_Li thank you very much :)