Compilare: user.cpp: In function ‘int main()’: user.cpp:44:9: warning: unused variable ‘x1’ [-Wunused-variable] {int x1,y1,x2,y2,d; ^ user.cpp:44:12: warning: unused variable ‘y1’ [-Wunused-variable] {int x1,y1,x2,y2,d; ^ user.cpp:44:15: warning: unused variable ‘x2’ [-Wunused-variable] {int x1,y1,x2,y2,d; ^ user.cpp:44:18: warning: unused variable ‘y2’ [-Wunused-variable] {int x1,y1,x2,y2,d; ^ user.cpp:44:21: warning: unused variable ‘d’ [-Wunused-variable] {int x1,y1,x2,y2,d; ^