Compilare: user.cpp: In function ‘int main()’: user.cpp:12:9: warning: unused variable ‘n’ [-Wunused-variable] int n, a, x, y=0, b, i=0; ^ user.cpp:12:12: warning: unused variable ‘a’ [-Wunused-variable] int n, a, x, y=0, b, i=0; ^ user.cpp:12:15: warning: unused variable ‘x’ [-Wunused-variable] int n, a, x, y=0, b, i=0; ^ user.cpp:12:18: warning: unused variable ‘y’ [-Wunused-variable] int n, a, x, y=0, b, i=0; ^ user.cpp:12:23: warning: unused variable ‘b’ [-Wunused-variable] int n, a, x, y=0, b, i=0; ^