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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

When writing a program, we often encounter a problem where we need to write a lot of the same code, and the code structure is the same. Always want to encapsulate this code and then call directly, but if this code logic is not complex, and the amount of code is not suitable for encapsulation, then we will think of C + + keyword define. In fact, it is wise of you to meet the above situation and think of something else----template, and we'll talk about

Understanding # define sreg (* (volatile unsigned char *) 0x5f) Understanding # define sreg (* (volatile unsigned char *) 0x5f)This definition is always very strange. I don't know why. I have a little bit of experience today. Please submit more bricks to the prawns ~~~ Embedded system programming requires programmers to use C language to access a fixed memory address. Since it is an address, according to

using the multi-dimensional dataset wizard, you can easily define a simple multi-dimensional dataset in SQL Server 2005. This wizard helps you define measurement values and dimensions for cubes. In this wizard, you can define a multi-dimensional dataset based on the data source, or you can define a multi-dimensional da

PHP uses the Define () function to define a constant. The so-called constant refers to the value of the amount of constant, this article collects a few about the PHP constants of the article, I hope that you understand the PHP constants help, come together to see it. The definition of 1.PHP constants and the use of examples to explain constants we can understand as the amount of constant value. Constants ar

Transferred from: http://www.cnblogs.com/kerwinshaw/archive/2009/02/02/1382428.htmlI. Usage of typedefA typedef is commonly used to define an identifier and an alias for a keyword in the C + + language, which is part of the language compilation process, but it does not actually allocate memory space, such as:typedef int INT;typedef int ARRAY[10];typedef (INT*) PINT;typedef can enhance the readability of the program, as well as the flexibility of ident

First, preprocessing commands he is not a constant!!!! Let's look at a piece of code #define @ "Avatar" if (false) { #define AVATAR @ " NSLog"} (Avatar); How much does this code output, we define "avatar" for 60, and then redefine "Avatar" in a code that never executes, the code in theif statement never executes, but at compile time , the compi

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

This article to share the content is detailed in the PHP constant: Define and const difference, has a certain reference value, the need for friends can refer to A constant is a simple identifier. This value cannot be changed during script execution (in addition to the so-called magic constants, they are not constants). Constants are case sensitive by default. Usually, constant identifiers are always uppercase. can be used

"Q" When defining constants in PHP, what is the difference between const and define? The "answer" uses the const to make the code easy to read, and the const itself is a language structure, and define is a function. In addition, const is much faster to compile than define. (1). Const is used to define a class member v

1. const is used for defining class member variables. once defined, the value cannot be changed. Define defines global constants that can be accessed anywhere. 2. define cannot be defined in the class, but const can. 3. const cannot define the constant if (...) {constFOO amp; #39;... SyntaxHigh in the condition statement. 1. const is used for defining class memb

# Ifndef # define # endif usage, # Ifndef # define # endif usage # Ifndef # Ifndef in the header, which is critical. For example, you have two C files, both of which include the same header file. During compilation, these two C files need to be compiled into a runable file together, so the problem arises and a large number of declarations conflict. Put the header file content in # ifndef and # endif. Wheth

1. Wide screen height and common size#define SCREEN_WIDTH ([UIScreen mainscreen].bounds.size.width)#define Screen_height ([UIScreen mainscreen].bounds.size.height)#define Navigationbar_height 44.0f#define Tabbar_height 49.0f#define Statusbar_height 20.0f#

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

Today continue to try the version of Seajs 2.3, then do something about the demo good, just a simple data template bar, and then through some other details in-depth study First look at the directory structure, according to the official demo erection Index.html is just a simple entry file and SEAJS configuration item, at the bottom there is a seajs.use load Crontroller module and then callback the exposed combine method Crontroller module, there are some official instructions and debugging, tri