Proper use of header files can provide two benefits: All files are guaranteed to use the same declaration for a given entity;
头文件的正确使用能够带来两个好处：保证所有文件使用给定实体的同一声明；
To start, it's necessary to include a number of header files at the start of your custom application that provide access to the required functions.
开始时，在访问所需功能的自定义应用程序的开头包含若干头文件是必要的。
In a typical development project, a number of header files relevant to the project may be included multiple times in different source files, and each header file may itself reference many others.
在典型的开发项目中，有很多与项目相关的头文件可能会在不同的源文件中多次被引入，而且每个头文件本身也可能引用很多其他头文件。
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