Compilare: user.cpp: In function ‘int d1(int, int)’: user.cpp:20:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int d2(int, int)’: user.cpp:26:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int d3(int, int)’: user.cpp:32:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int d4(int, int)’: user.cpp:38:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int d5(int, int)’: user.cpp:44:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int d6(int, int)’: user.cpp:50:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int d7(int, int)’: user.cpp:56:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int d8(int, int)’: user.cpp:62:1: warning: control reaches end of non-void function [-Wreturn-type] } ^