The header file refers to a text file, which contains information such as type definitions, constants, function declarations and macros, which will be used in the code (program). When compiling a program, a header file is used, and the information in the header file can be compiled into the program for use in the code. Header files are divided into system header files and local header files. System header files contain function libraries and constants provided by compilers and operating systems, while local header files are code segments (functions, variables, macros, etc. ) The programmer wrote it himself.

The header file is a part of the code module, and it will not be linked to the executable program. It is a statement in the source code file, which is used to introduce external modules for easy use. The header file works like a kitchen recipe. It describes how to combine different components to make a delicious food. The functions and data types defined in the header file are also the basis for programmers to write code, because programmers can store commonly used code segments in their own code base and reuse them in multiple projects.

Header files have certain advantages and disadvantages. Header files can better organize the code, make the code look clearer, and let different programmers cooperate to complete a program. However, header files may also lead to naming conflicts and unnecessary dependencies. Programmers should carefully consider the advantages and disadvantages of using header files in order to make wise decisions when writing code and avoid using too many header files. At the same time, check whether the used header file contains the required functions, macros and data types, which will help improve the code quality and maintainability.