Compilare: user.cpp: In function ‘int hash_sub(int)’: user.cpp:15:9: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int hash_s(int, int)’: user.cpp:23:9: warning: no return statement in function returning non-void [-Wreturn-type] } ^ /tmp/ccKMRaZ5.o: In function `main': user.cpp:(.text.startup+0x53): warning: the `gets' function is dangerous and should not be used.