Compilare: user.cpp: In function ‘int main()’: user.cpp:58:9: warning: unused variable ‘j’ [-Wunused-variable] { int i,j,x=0,y=0,x2,y2; ^ user.cpp:58:11: warning: unused variable ‘x’ [-Wunused-variable] { int i,j,x=0,y=0,x2,y2; ^ user.cpp:58:15: warning: unused variable ‘y’ [-Wunused-variable] { int i,j,x=0,y=0,x2,y2; ^ user.cpp:58:19: warning: unused variable ‘x2’ [-Wunused-variable] { int i,j,x=0,y=0,x2,y2; ^ user.cpp:58:22: warning: unused variable ‘y2’ [-Wunused-variable] { int i,j,x=0,y=0,x2,y2; ^