Compilare: main.cpp: In member function 'int roller::pushback(int)': main.cpp:39:2: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In member function 'void roller::epicroll(int)': main.cpp:57:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(!val.empty() && val.size() >= dlt){ ~~~~~~~~~~~^~~~~~