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  • LI WEI thinks this is interesting:

The first thing we see is an #include statement. We are asking C++ to copy and paste the contents of another C++ source file, called <iostream>, directly into our code file. The <iostream> is a standard C++ library that handles all the sticky code that lets us print text to the screen.

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Cover of Learning C++ by Creating Games with UE4

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将头文件的代码放在这里