Compilare: main.cpp: In function 'int main()': main.cpp:52:11: warning: unused variable 'x' [-Wunused-variable] int i,x,y,d; ^ main.cpp:52:13: warning: unused variable 'y' [-Wunused-variable] int i,x,y,d; ^ main.cpp:52:15: warning: unused variable 'd' [-Wunused-variable] int i,x,y,d; ^