Compilare: user.cpp: In function ‘int main()’: user.cpp:32:18: warning: variable ‘a’ set but not used [-Wunused-but-set-variable] bool a,b,c,d; ^ user.cpp:32:20: warning: variable ‘b’ set but not used [-Wunused-but-set-variable] bool a,b,c,d; ^ user.cpp:32:22: warning: variable ‘c’ set but not used [-Wunused-but-set-variable] bool a,b,c,d; ^ user.cpp:32:24: warning: variable ‘d’ set but not used [-Wunused-but-set-variable] bool a,b,c,d; ^