Compilare: user.cpp: In function ‘int main()’: user.cpp:14:11: warning: unused variable ‘last’ [-Wunused-variable] int n,last,a=0,b=0; ^ user.cpp:14:16: warning: unused variable ‘a’ [-Wunused-variable] int n,last,a=0,b=0; ^ user.cpp:14:20: warning: unused variable ‘b’ [-Wunused-variable] int n,last,a=0,b=0; ^