在C语言家族程序中，头文件被大量使用。一般而言，每个C++/C程序通常由头文件(header files)和定义文件(definition files)组成。头文件作为一种包含功能函数、数据接口声明的载体文件，主要用于保存程序的声明(declaration)，而定义文件用于保存程序的实现 (implementation)(In the C language family program, the header files are used in large quantities. Generally speaking, each C++/C programs are usually header file (header files) and (definition files) component definition file. Header file, as a carrier file containing function function and data interface declaration, is mainly used to save program declarations (Declaration), while the definition files are used to save program implementation (Implementation).)