— User 无 has 1/2 warnings; be careful! The latest warn was because: read the rules, no screen photo.
It is not. But in general this is a very good practice. Do you really need an include guard or not -- this depends on your code.
— Okay，i see
— This is a good example where arrays are good to use.
— I'd say loops, but this doesn't need an array I think
— Actually the Net is a big junkyard full of any shit you can imagine, so if I google it, I can find anything, proof that C is faster then C++, proof that C++ is faster then C, proof that Americans didn't travel to the Moon, proof that Lenin was a mushroom -- anything.