Unreachable code

Question

Does anyone know what ‘unreachable code’ means? I have a c# program that works just fine, but every time I run it I get 20+ unreachable code errors below the output, but it doesn’t effect the program at all.
https://code.sololearn.com/cdVRfRk9FHUq/?ref=app

Answer 1

delete the `break` after `return` works