Borderou de evaluare (job #41498)

Compilare: user.cpp: In function 'int Expr()': user.cpp:24:1: warning: no return statement in function returning non-void [-Wreturn-type] user.cpp: In function 'int Add()': user.cpp:36:1: warning: no return statement in function returning non-void [-Wreturn-type] user.cpp: In function 'int Sub()': user.cpp:48:1: warning: no return statement in function returning non-void [-Wreturn-type] user.cpp: In function 'int Mul()': user.cpp:60:1: warning: no return statement in function returning non-void [-Wreturn-type]