Compilare: user.cpp: In function ‘int main()’: user.cpp:4:11: warning: unused variable ‘first’ [-Wunused-variable] #define x first ^ user.cpp:19:9: note: in expansion of macro ‘x’ int x,y,r=0,i; ^ user.cpp:5:11: warning: unused variable ‘second’ [-Wunused-variable] #define y second ^ user.cpp:19:11: note: in expansion of macro ‘y’ int x,y,r=0,i; ^