Beginner's error

Question

compiler.csharp: error CS0103: The name 'xp' does not exist in the current context

Answer 1

https://code.sololearn.com/c7Pmj7I8mb8b/?ref=app

Answer 2

You forgot the brackets of the Main function. Also you didn't declare and set the xp variable.

Answer 3

But how to declare thank you

Answer 4

https://code.sololearn.com/cotsAYZ6jqo6/?ref=app