Compilation error (line 15, col 17): 'Square.GetArea()' hides inherited member 'Shape.GetArea()'. Use the new keyword if hiding was intended.
Compilation error (line 15, col 31): 'Shape._side' is inaccessible due to its protection level
Compilation error (line 15, col 45): 'Shape._side' is inaccessible due to its protection level
Compilation error (line 20, col 22): 'Square' does not contain a constructor that takes 1 arguments
Compilation error (line 12, col 7): There is no argument given that corresponds to the required parameter 'n' of 'Shape.Shape(int)'