In file included from main.cpp:8:0:
num.cpp: In member function 'Num& Num::operator=(const Num&)':
num.cpp:12:1: error: expected ';' before '}' token
 }
 ^
num.cpp:12:1: error: no return statement in function returning non-void [-Werror=return-type]
cc1plus: all warnings being treated as errors