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1. Simple define Definition#define MAXTIME 1000A simple maxtime is defined, it represents 1000, if it is written inside the programif (IThe compiler replaces the maxtime with 1000 before processing the code.Such a definition looks similar to a normal const definition, but it is also different because the definition of define is more like a simple text substitutio

The use of a typedef In C/s + + language, a typedef is commonly used to define an identifier and a keyword alias, which is part of the language compilation process, but it does not actually allocate memory space, as in the case of: typedef int INT;typedef int ARRAY[10];typedef (int*) pint; A typedef enhances the readability of the program, as well as the flexibility of the identifier, but it also has drawbacks such as "not intuitive". Second, #

The examples in this article describe how classes are defined in JavaScript. Share to everyone for your reference, specific as follows: JavaScript itself does not support object-oriented, it does not have an access control character, it does not define the class's keyword class, it does not support inherited extend or colons, nor does it support virtual functions, but JavaScript is a flexible language, Let's take a look at how JavaScript, without the

Note: The latest version of FrontPage is Frontpagexp (FrontPage 2003), this article is about Frontpage2000, but the method described in this article is basically applicable in Frontpagexp! Another, This is only discussed in Frontpage2000 how to define CSS, as for the knowledge of CSS, please refer to the relevant information. When many people find it convenient to define CSS in DW4, they start complaining

There are many places in the C language where macro definitions are used, such as in header files to prevent header files from being repeatedly included: #ifndef ctest_header_h #define CTEST_HEADER_H /header file content #endif Many macro definitions are also available in our common stdio.h header files, such as: #define BUFSIZ 1024//Buffer size #define EOF ( -1

Jency LeeLinks: http://www.cnblogs.com/Jency/articles/C_Cplusplus_define.html1. Simple define Definition #define MaxTime + A simple maxtime is defined, which represents 1000 if you write in the program if (i Compiler replaces maxtime with 1000 before processing the code. The definition of looks similar to a normal const definition, but it is also different because the definition of

The pros and cons of Const and # define, thus deriving the meaning of const;Both const and # define have a similar function, which is to define a "constant";This is the way you want to replace a # define constant. This is a way to define macros. Because macro substitution de

#defineThe command #define defines an identifier and a string. Each time the identifier is encountered in the source program, it is substituted with a defined string. The ANSI standard defines an identifier as a macro name and replaces the process with a macro substitution. The general form of the command is: #define Identifier string Attention:1. The statement does not have a semicolon. There

The difference between #define, const, typedef#define is not defining variables, it's just for text substitution.For example:#define PI 3.1415926float Angel;angel=30*pi/180;Then, when the program is compiled, the compiler will first "#define PI 3.1415926" after the "PI" in all the code is replaced by "3.1415926"and the

Tag:io use spon file div bs code ad First, let's start with the beginning of the file, in a lot of header files, we will see this statement #ifndef _myheadfile_h #define _MYHEADFILE_H//.... Statement ... #endif//_myheadfile_h in order to avoid the same file being included multiple times, we often use #ifndef to determine, if not include _myheadfile_h, define a macro with a # # _myhea　　Dfile_h, #endif and #i

css| Tips | Web page First look at the following code: Onclick= ' Document.all.file1.click (); document.all ("Text1"). Value=document.all ("File1"). Value; ' > This just know that the original file domain can also be defined by scripting! But Firefox doesn't support it. So I wrote a little about the form of the definition of the style, carefully studied the following: 　　1.form First, the form has a boundary, a filler. Be sure to remember, or you will never find out where the problem is when you

Original address: http://blog.csdn.net/q191201771/article/details/6399820 Here to explain the next few basic knowledge, I believe that most people for the following points are already known, you can also jump to the last part of the #ifndef#define#endif to see the real role 1. In the precompiled phase, all #include "***.h" ("" and replaced with ***.h content. And then there's No. h all of the contents of. h are included in the. cpp that requires them

 #define MODULE_INIT (func) module_init_level (func,5)#define MODULE_EXIT (func) module_exit_level (func,5) #define SERVICE_INIT (func) module_init_level (func,1) #define Service_start (func) Module_init_level (func,8) #define SERVICE_STOP (func) module_exit_lev

There are two ways to define constants in C #, one called Static constants (Compile-time constant) and the other is called Dynamic constants (Runtime constant). The former is defined by "const", which is defined by "ReadOnly". For static constants (Compile-time constant), it is written in the following ways: public const int max_value = 10; Why do you call it a static constant because, as the above declaration can be interpreted as follows (note: T

is a shopping cart that stores the goods purchased from the store. Members of the club can enjoy a 10% discount, so the value can be saved as a constant: The code is as follows Copy Code Private Const Memberdiscountpercentage as single=0.1 After you have calculated the total price of an order, you can use the constant just as you would any other variable: The code is as follows Copy Code Memberdiscount=subtotal=memberdiscountpe

# Define is a macro definition Command provided in C language. Its main purpose is to provide programmers with some convenience in programming and improve the program running efficiency to a certain extent, however, students often cannotUnderstanding the essence of this command always creates some confusion here. This command is misused during programming to make the program run differently from the expected purpose, or when reading a program written

. Let's take a closer look at the msdn example and have a good understanding. The following is an example of how to define a Unified Version macro. Assume that the project contains the resource script file resource. RC, and the unique version number is stored in define. h. Other CPP files that require version numbers contain this file. Let's take a look at define

(PHP 5 >= 5.3.0, PHP 7) You can also define multiple namespaces in the same file. There are two syntactic forms of defining multiple namespaces in the same file. Example #1 Define multiple namespaces, simple combination syntax It is not recommended to use this syntax to define multiple namespaces in a single file. It is recommended that you use the syntax in

C + + programming excellent and Pascal is one of the reasons for the existence of STL (Standard Template Library) in C + +. There are many useful ways to STL. Many methods in the C + + Template Library require an orderly correlation of parameters, such as sort (). Obviously, if you want to sort a set, you have to know the object in the collection, which is in the back of the previous one. Therefore, it is very important to learn how to define the com

Before learning C language, our teacher taught us that it is best to define a number with a macro (#define). So that I have been accustomed to #define age 12. In the C language environment, this is indeed an effective way to increase the readability of the program, but in C + +, you can have a more graceful implementation. 1. When you write down #