Compilare: user.cpp: In function ‘int verif_diagp_up(int, int)’: user.cpp:34:5: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int verif_diagp_down(int, int)’: user.cpp:43:5: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int verif_diags_up(int, int)’: user.cpp:52:5: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int verif_diags_down(int, int)’: user.cpp:60:5: warning: control reaches end of non-void function [-Wreturn-type] } ^