pot definition

First, preface In C-language code or C + + code, macro definition #ifndef ... #define ... #endif主要是为了避免头文件重复引用, how is it a avoidance mechanism? This is related to the scope of the macro definition. Two, macro definition scope First, the scope of the macro definition in the C language standard is, starting at the defi

Can global variables be defined in header files that can be contained by multiple. c files? Why?Yes. The global variables with the same name are declared in static form in different C files. Variables and functions cannot be directly defined in the header file, but static variables and classes can be defined. Extern usage, global variables and header files (repeated definition) # Include can contain declarations of variables and functions in other hea

"Definition" and "declaration" of functions are not the same thing. The definition of function refers to the establishment of function function, including specifying function name, function value type, formal parameter and its type, function body, etc., which is a complete and independent function unit. And the function of the declaration is to put the function of the name, the function type and the type, n

We know that adding prototype to JavaScript classes is very easy. The following two methods are commonly used. Are there any differences between the two methods?JScript Class:Copy codeThe Code is as follows:Function JSClass (){}Extends prototype method:Copy codeThe Code is as follows:JSClass. prototype. MethodA = function (){};OrCopy codeThe Code is as follows:Function = JSClass. prototype. MethodA (){};# Re: differences between the two implementations of the JS class

Recently in reading a book about C, the definition of function declaration and function is very vague, not clear, Baidu a bit, found a post written is very good, reproduced over:Original:"Define" and "declare" a function are not the same thing. function definition refers to the establishment of function function, including specifying function name, function value type, formal parameter and its type, functio

How to update the virus definition for the Symantec AntiVirus Enterprise Edition This document is translated from English documents. The original English document may have been modified and updated after the release of this translation. Symantec does not guarantee the accuracy of this translation document.SituationWant to learn how to update the Symantec AntiVirus Enterprise version of the virus definition

C ++ declaration and definitionC ++ declaration and definition The Declaration is to introduce a name into the program. The definition provides a unique description of an object in the program. Declarations and definitions sometimes exist at the same time. Such as int; Extern int B = 1; It is declared only when there is no initialization in extern. In other cases, it is both a

Transferred from: http://www.cnblogs.com/rocketfan/archive/2009/10/02/1577361.html 1. compilation unit: A. cc or. cpp file is used as a compilation unit to generate. O. 2. Definition and declaration of common data types, Function Definition and Declaration (class functions are the same ). Extern int X; // The variable is declared and no actual address is allocated. No actual target code is generated.Void p

which is processed by the system reference preprocessor, and the preprocessing part refers to the preprocessing commands that start with "#", which is placed outside the function, and generally placed in front of the source file, such as: command #include, Macro command #define, etc. The reasonable use of preprocessing functions can make the program more convenient to read, modify, transplant, debug, and also conducive to modular programming. This article mainly describes the following sections