Compilare: user.cpp: In function ‘int main()’: user.cpp:30:6: warning: variable ‘a’ set but not used [-Wunused-but-set-variable] int a , b , c; ^ user.cpp:30:10: warning: variable ‘b’ set but not used [-Wunused-but-set-variable] int a , b , c; ^ user.cpp:30:15: warning: variable ‘c’ set but not used [-Wunused-but-set-variable] int a , b , c; ^ user.cpp:33:6: warning: variable ‘value’ set but not used [-Wunused-but-set-variable] int value = 0; ^