Compilare: user.cpp: In function ‘int main()’: user.cpp:18:15: warning: unused variable ‘y’ [-Wunused-variable] int a,b,x,y,i,j,k; ^ user.cpp:18:17: warning: unused variable ‘i’ [-Wunused-variable] int a,b,x,y,i,j,k; ^ user.cpp:18:19: warning: unused variable ‘j’ [-Wunused-variable] int a,b,x,y,i,j,k; ^ user.cpp:22:12: warning: unused variable ‘q’ [-Wunused-variable] double q,w,e; ^ user.cpp:22:14: warning: unused variable ‘w’ [-Wunused-variable] double q,w,e; ^ user.cpp:22:16: warning: unused variable ‘e’ [-Wunused-variable] double q,w,e; ^