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In # define, the standard defines only # and # #两种操作. #用来把参数转换成字符串, # #则用来连接两个前后两个参数, turn them into a string.#define CONN (x, y) x# #y//connection X, Y#define TOCHAR (x) #@x//Plus Single quote#define TOSTRING (x) #x//plus double quotation marksRecently read the COM related information, see CCmdTarget Implement COM int

#define是C语言中提供的宏定义命令, the main purpose is to provide programmers with a certain degree of convenience in programming, and to a certain extent to improve the efficiency of the program, but students often do not understand the nature of the command, always here to create some confusion, the programming misuse of the command, So that the operation of the program is inconsistent with the intended purpose, or read the program written by others, the results

Macro definition in C # define usage, # 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, when learning this command, students often cannot understand the essence of the command, and there is always some confusion here. The command is misused dur

Original article address: Http://blog.csdn.net/kindazrael/article/details/8108868 In C, Preprocessor is a powerful tool that makes your code easier to read and modify. With preprocessing code, you can redefine a part of the code to make your code more suitable for your style. Preprocessor is processed in advance before the code is compiled. The pre-processing code starts with a pound sign.1. About #define #defineDeclarations are mainly used to assign

#define宏定义在C系开发中可以说占有举足轻重的作用. The underlying framework does not have to say, in order to compile optimization and convenience, as well as cross-platform capabilities, macros are heavily used, it can be said that the bottom of development left define will be unable to move. When developing at a higher level, we put more emphasis on business logic and seem to have little use and reliance on macros.But the ben

# 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, when learning this command, students often cannot understand the essence of the command, and there is always some confusion here. The command is misused during programming, so that the program runs differently from the expected purpose, or

1. Define a simple constant: Define a constant to facilitate modification. (do not add a semicolon to the end !) # Define n 1000 is equivalent to const int n = 1000, but slightly different, define is just a simple replacement, rather than using it as a quantity. 2. defining simple functions: note that brackets are ofte

Asynchronous modules define AMD and asynchronous modules amd It is called Asynchronous Module Definition, and is defined by Asynchronous components (or modules. AMD is a mechanism in which components and their dependencies can be asynchronously loaded.Define Method define(id?, dependencies?, factory); Component ID The component ID is the unique identifier of a component. In a script file that is one-to-one

I. Usage of typedef In C/C ++, typedef is often used to define an alias for an identifier and a keyword. It is part of the language compilation process, but it does not actually allocate memory space, such: Typedef int;Typedef int array [10];Typedef (int *) pint; Typedef can be enhancedProgramBut it also has some disadvantages such as "non-intuitive. Ii. # define usage #

Difference between typedef and # define 1. typedef Typedef is the meaning of the type definition, but itInstead of defining a new type, you can create an alias for an existing type., Similar to the meaning of the reference,References are aliases of variables or objects, while typedef defines aliases of types.. Typedef has two main functions: 1.1 simplify complex type declarations Simplify complex type declarations, or give existing types an alias

Difference between typedef and # define The benefits of renaming constants using macro definitions: The program is easy to implement and easy to maintain and modify; 1) # define is a pre-processing command that performs simple replacement during compilation and preprocessing without checking the correctness, if the meaning is correct or not, possible errors are discovered and an error is reported only when

1, define--(no parameter macro definition)Usage: The general form is: #define Identifier string(1) "#" means that it is a pre-processing command, usually "#" is the pre-processing command;"Define" defines the command for the macro; "identifier" is the defined macro name; "string" can be a constant, an expression, a string, and so on.(2) In addition to the frequen

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

A constant is an identifier (first name) of a simple value. As the name implies, the value cannot be changed during script execution (except for the so-called magic constants, they are not constants). Changshime is considered to be case sensitive. Usually, constant identifiers are always uppercase. You can use the Define () function to define constants. After PHP 5.3.0, you can use the Const keyword to

#ifndef#define#endif的用法#ifndef#define#endif的用法  你所遇到的这几个宏是为了进行条件编译。一般情况下，源程序中所有的行都参加编译。但是有时希望对其中一部分内容只在满足一定条件才进行编译，也就是对一部分内容指定编译的条件，这就是“条件编译”。有时，希望当满足某条件时对一组语句进行编译，而当条件不满足时则编译另一组语句。     条件编译命令最常见的形式为：     #ifdef 标识符     程序段1     #else     程序段2     #endif         它的作用是：当标识符已经被定义过(一般是用#define命令定义)，则对程序段1进行编译，否则编译程序段2。     其中#else部分也可以没有，即：     #ifdef     程序段1     #