C++(翁凯）Note

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翁凯老师C++课的笔记，强烈安利！（网易云课堂）

头文件

  1. only declarations are allowed to be in .h(.h里放声明，不放定义)
    1. extern variables
    2. functions prototypes
    3. class/struct declaration
  2. #include
    1. #include’xx’: first search in the current directory,then the directories declared somewhere
    2. #include<xx.h>: search int the specified directories(系统头文件目录,linux下/usr/include/)
    3. #include: same as #include<xx.h>

  3. Standard header file structure(标准头文件结构)

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    #ifndef HEADER_FLAG  
    #define HEADER_FLAG  
    //Type declaration here  
    #endif //HEADER_FLAG

  4. Tips for header

    1. One class declaration per header file
    2. Associated with one source file in the same prefix of file name(一个头文件不能被include两次)
    3. The contents of a header file is surrrounded with #ifndef #define #endif
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