Compilare: user.cpp: In function ‘int main()’: user.cpp:9:9: warning: unused variable ‘i’ [-Wunused-variable] int i,j,x,y; ^ user.cpp:9:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,x,y; ^ user.cpp:9:13: warning: unused variable ‘x’ [-Wunused-variable] int i,j,x,y; ^ user.cpp:9:15: warning: unused variable ‘y’ [-Wunused-variable] int i,j,x,y; ^