Compilare: user.cpp: In function ‘int s_1(int)’: user.cpp:12:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int s_3(int)’: user.cpp:19:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int s_2(int)’: user.cpp:26:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^