Compilare: user.cpp: In function ‘int init()’: user.cpp:11:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int tipar()’: user.cpp:41:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int back()’: user.cpp:55:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^