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。
Use LED digital display counter plan of tube T0 numerical, including 51 SCM registers definition of header files.
用LED数码管显示计数器t0的计数值，包含51单片机寄存器定义的头文件。
Use LED digital display counter plan of tube T0 numerical, including 51 SCM registers definition of header files.
用LED数码管显示计数器t0的计数值，包含51单片机寄存器定义的头文件。
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