Compilare: user.cpp: In function ‘int romb(double, double, double, double, double)’: user.cpp:29:18: warning: variable ‘df’ set but not used [-Wunused-but-set-variable] int cont = 1,df; ^ user.cpp: In function ‘int main()’: user.cpp:55:11: warning: unused variable ‘x’ [-Wunused-variable] int n,x,y,dx,dy,k,cx,cy; ^ user.cpp:55:13: warning: unused variable ‘y’ [-Wunused-variable] int n,x,y,dx,dy,k,cx,cy; ^