Error(s):

(5:15) Syntax error, '(' expected
(6:1) Invalid parameter type 'void'
(6:13) ) expected
(5:14) Overloadable unary operator expected
(8:2) Invalid token '=' in class, struct, or interface member declaration
(8:18) Invalid token '(' in class, struct, or interface member declaration
(8:35) Invalid token '(' in class, struct, or interface member declaration
(9:2) Invalid token '=' in class, struct, or interface member declaration
(9:18) Invalid token '(' in class, struct, or interface member declaration
(9:35) Invalid token '(' in class, struct, or interface member declaration
(10:24) Invalid token '(' in class, struct, or interface member declaration
(10:41) Invalid token '(' in class, struct, or interface member declaration
(12:1) Type or namespace definition, or end-of-file expected
(13:1) A namespace cannot directly contain members such as fields or methods