How to use Include Cpp

This article mainly introduces "how to use Include Cpp". In daily operation, I believe many people have doubts about how to use Include Cpp. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "how to use Include Cpp"! Next, please follow the editor to study!

Question one: what is this?

C++ is an unfathomable language, there are all kinds of ways to write, and # include is essentially copy and paste code, I dare not say that others wrote wrong, maybe the developer is C++ boss, it is normal to write some code that we ordinary people can not understand.

Question 2: the whole project is referenced in this way, which will not cause a function to be defined repeatedly?

To this end, I checked some information and did some tests:

Code snippet 1:

/ / file1.cc # include using std::cout; void ddd () {cout