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[Reprint]C Language macro definition

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

C + + Journal macro definition function

In the C and C + + languages, an identifier is allowed to represent a string, called a macro, which can be a constant, an expression, a format string, and so on. When compiling preprocessing, all occurrences of the "macro name" in the program are substituted with the string in the macro definition, which is called "macro substitution" or "macro expansion". A macro definition is done by a macro

iOS notes-macro definition, conditional compilation, and file import notes

1, preprocessing instructions (1) Concept: C language in the source program before compiling, will first of some special preprocessing instructions to explain (such as #include (2) Preprocessing instructions are all preceded by "#" and do not end with a semicolon. (3) Preprocessing instructions can be placed anywhere in the file, his scope is from where it appears to the end of the file, we often put it in the source program head, so that its scope is the entire source program file. (4) Preproce

C + + template static member definition (instantiation)

Ask questions:If you have such a template:Template What is right (by compiling) for several of the following definitions? Template In order not to affect the analysis and judgment, I put the answer color into a relatively light color, the following is the answer: Template Template Template Template Template Template Question Answer:First, explain the three correct answers.The first form is called the definition

Lenovo High Definition Audio Manager settings method

First, open method Double-click the Start-Control Panel-lenovo High Definition Audio Manager icon: Or double-click the "Lenovo High Definition Audio Manager" icon in the lower right corner: Introduction of Functional interface 1. "Lenovo High-definition Audio Manager-volume"; 2. "Lenovo High-

Photoshop path is fully proficient in the three-node definition of the manual

after learning this article, focus on the Photoshop path fully proficient in the manual series ( a two three four five) other articles The Photoshop software provides a set of tool groups for building, editing, and setting paths, which are located in the Toolbox floating panel in the Phtoshop software, and their icons are rendered as pen icons by default, as shown on the right. Use the left mouse button click here icon for two seconds, the system will pop up the hidden tool Group, total

JavaScript definition class and class implementation example detailed _javascript skills

The examples in this article describe the implementation of JavaScript definition classes and classes. Share to everyone for your reference, specific as follows: It has been frequently seen in several groups that a function in a class is asked how to call this. The method that is exposed after the definition. Now send a class to realize the essay. First of all, class, in a class we will have the following

(reprint) Hello, C + + (24) What a big box! Declaration and definition of the 5.1.1 function

water function, you can meet the bubble surface and cooking two process of boiling water function needs, both time and effort. Since the function has so many benefits, let's look at how to define and use the function.Figure 5-1 Wrapping the program into a box, divide and conquerDeclaration and definition of the 5.1.1 functionTo use variables to express data in a program, we must declare and define the variables before we can use them. Similarly, to u

Spring (v) Bean definition inheritance and dependency injection

One, bean definition inheritanceA bean definition can contain many configuration information, including constructor parameters, property values, and container-specific information, such as initialization methods, static factory method names, and so on.the child bean definition inherits the configuration data from the parent d

XML Getting Started fine solution file format definition

An XML DTD can actually be viewed as a template for one or more XML files, the elements in these XML files, the attributes of the elements, the arrangement/order of elements, the content that elements can contain, and so on, must conform to the definitions in the DTD. The elements in the XML file, the tags we create, are created based on the actual circumstances of our application. It is difficult to create a highly integrated, adaptable DTD because all walks of life have their own industry char

Linux Learning Notes--Example makefile Add macro definition

0. PrefaceFrom the beginning of learning C language began to contact Makefile, consulted a lot of makefile information but always feel no real master makefile, if you write a makefile always feel very laborious. So deliberately using the blog to summarize the relevant knowledge of makefile, through examples to illustrate the specific use of makefile. The example says that makefile roughly divides into 4 parts 1. Only a single C file 2. Contains multiple C files 3. Need to include header file pa

The definition of the inline function in C + + can be placed in the header file, and the inline function repeats without causing a connection error.

Attached: http://blog.csdn.net/yingxunren/archive/2009/10/13/4663014.aspx Inline can be placed in. cpp, but at this point only the CPP file can use itIf you want to make it public, you must put it in. h, and if you do not want to put it in. h, you must copy each CPP file.In fact, even if you put it in. h, it's a copy of each CPP file, except that the compiler completes the copy for you.Inline function recurrence does not cause connection errors, that is, you can repeat the

Macro Definition Usage Analysis

? macro definition: In a program, the start of a # is a preprocessing instruction.#define定义宏常量can appear anywhere in the code. As shown in the following illustration:To determine whether the macro definition is correct, to take the content of the macro definition to the real program, according to the actual program. #define从本行开始, this macro constant is availabl

Declaration and definition of global variables in C + +

Original link: http://blog.csdn.net/candyliuxj/article/details/7853938(1) Compilation unit (module)After compiling the code on VC or VS, and clicking the Compile button to prepare the EXE file, the compiler does two steps:The first step: compile each. cpp and the corresponding. h file into an obj file;Step two: Link the project's obj file to generate the final. exe file.As a result, errors can occur in two places:One is the error that occurs at compile time, mainly is the syntax error;One is the

ExtJS Basic--function The method that can be executed at the time of definition Function () {...} ()

The function () of the method that can be executed when the function is defined in Ext.js () {...} () JS Code /** * Part Two function: The function of the method that can be executed at the time of definition () {...} (); Note that after the red parenthesis , the function definition, the price brackets are defined and then executed */ /** * I. Definition

Linux view C structural body definition __linux

Today, when you write a program, you use the Pthread_cond_timedwait function, which is the prototype: int pthread_cond_timedwait (pthread_cond_t *restrict cond, Pthread_ mutex_t *restrict Mutex, const struct TIMESPEC *restrict abstime); The last parameter is the TIMESPEC structure, but the man did not give a specific definition, had to check it himself. The following is the specific steps, but also for everyone to make a reference, while welcome to p

C language macro definition use Analysis _c language

1. How do I differentiate between macro names and macro strings in a macro definition? What should I pay attention to for macros with parameters? In a macro definition, the macro name and macro string are distinguished by spaces. When the compiler is working on a macro definition, first read the string from the first space after "#define" until the next space is

Database schema definition Language

The database schema definition language DDL (Data Description Language) is the language used to describe the real-world entities to be stored in the database. A database schema contains descriptive definitions for all entities in the database. These definitions include the structure definition, the operation method definition, and so on. The pattern of DDL descr

Definition of "programming language" variables and differences from extern declarations

The difference between a variable's definition and a declarationFirst, the definition of a variable must occur before the variable declaration (extern), the declaration of a variable can have more than one, but the definition of the variable is only one, the declaration of the variable affects the reference and scope of the variable, and the

The definition and execution of JavaScript functions

To understand the definition and execution of JavaScript functions, you need to know these important concepts first, and now you can understand them later!the execution environment of the function (Excution context), the active object (call object), scope (scope), scope chain (scope chain). Next, let's take this function as an example to analyze:Steps:1. Set the scope chainWhen you define function A, the JS interpreter willScope Chain (scope chain)Set

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