Compilare: user.cpp: In function ‘unsigned int tip_1(int)’: user.cpp:11:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘unsigned int tip_2(int)’: user.cpp:19:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘unsigned int tip_3(int)’: user.cpp:22:9: warning: unused variable ‘a’ [-Wunused-variable] int a=0, b=1; ^ user.cpp:22:14: warning: unused variable ‘b’ [-Wunused-variable] int a=0, b=1; ^ user.cpp:30:1: warning: control reaches end of non-void function [-Wreturn-type] } ^