extern static variable

Const, static, extern usage summary, constextern Const application: 1. For the basic declaration const int r = 100; // standard const variable declaration and initialization, the compiler will directly replace it with 100 during compilation after

Analysis on the usage of http://www.cnblogs.com/rollenholt/archive/2012/03/20/2409046.htmlextern "C" 1. IntroductionC ++ language was originally created as "a better C ", however, this does not mean that the compilation and connection methods used

One, the use of extern method The following is an explanation of extern in the C language program: In all source files of a source program, an external variable can only be defined once in a file, and other files are accessed through an extern

1. Declaring external variables Modern compilers are generally compiled by file, so at compile time, the global variables defined in each file are Transparent to each other, that is, at compile time, the visible domain of the global variable is

1. Basic explanationExternIt can be placed before a variable or function to indicate that the definition of a variable or function is in another file, prompting the compiler to find its definition in other modules when it encounters this variable

1 Basic explanation:extern can be placed before a variable or function to mark the definition of a variable or function in another file, prompting the compiler to find its definition in other modules when it encounters this variable and function.

The attributes of variables and functions include the data type and data storage class. The storage class index data is stored in memory (static and dynamic), including auto, static, register, and extern.   Memory. Specifically, memory is divided

Extern usage and extern usage In C, the modifier extern is used before the declaration of a variable or function to indicate that "this variable/function is defined elsewhere and must be referenced here ". (Extern can be placed before a variable or

Knowledge Points:External functions: Defined functions can be accessed by this file and other files1> all functions are external functions by default2> external functions with the same name are not allowedIntrinsic functions: Defined functions can

Transfer from chao_yu,cnblog.com1 Basic explanation : extern can be placed before a variable or function to indicate the definition of a variable or function in another file, prompting the compiler to find its definition in other modules when