how to use define

People who are new to MFC programming are often intimidated by various macro definitions and preprocessing commands generated by the MFC wizard. However, preprocessing and macro definition are a powerful tool in C language. They can be used for

Original article: constants in c ++ A constant is an identifier whose value remains unchanged during running. The C language uses # define to define constants (called macro constants ).In addition to # define, the C ++

C ++ those details -- typedef keyword, details -- typedef keyword I. About the typedef keyword. I used to use it to redefine the struct alias when I learned the C language. Later I used some function pointers, but I don't know how to use them. Today,

Difference between const and # define, (1) Different compiler Processing MethodsThe define macro is expanded in the preprocessing phase. Const constants are used in the compilation and running phase. (2) Different Types and security checks The

Set document structure File Type: Create HTML document structures, headers, and subjects: Section text content Line Break Specify the webpage title and metadata(Placed in the header ) webpage title text Introduce style

Copy codeThe Code is as follows:/* data types are converted to each other * Forced conversion * SetType (variable, type); // int, integer, float, double, and so on. * This function changes the type of the original variable. You can use var_dump ()

You may already be a veteran of PHP and have written a lot of very good code. However, if you want to add them to your current project, is it difficult? Your friend wants to use your code as a module in his project, but you find that you have used a

This keyword can only be used to define classes and methods. The final keyword cannot be used to define member attributes. because final is a constant, we use define () to define constants in PHP () function, so you cannot use final to define member

This article mainly introduces the definition of AMD asynchronous modules and the methods for using jQuery and jQuery plug-ins in Require. js. For more information, see AMD Module The overall goal of AMD (Asynchronous Module Definition) format is

Php annotation specifications. For more information about php, see Php annotation specifications. For more information about php, see @ Access Usage scope: class, function, var, define, module Indicates the access permission for a keyword:

Before writing a piece about the game engine design article, today uses the game engine to implement a small game (actually is not the strict meaning game), mainly is in order to feel the game engine to the game design to bring the convenience, but

First, to talk about the constIn general,Const is primarily used to prevent defined objects from being modified again, and to initialize variables when defining object variables. Common usage is as follows:1. Used to define a constant variable so

The most important reason to constrain an animated article than expected is that I didn't find enough animations to explain the constraint animations--not because constrained animations are too difficult, of course. On the contrary, because the

It is also a post of kernel function analysis, I personally think that the Windows kernel is the best teacher, when you want to implement a function can see how the Windows kernel is done, perhaps there is inspiration:)First, take a look at the

Excerpt from: http://blog.chinaunix.net/uid-17188120-id-4026378.html1. Simple macro definition#define Identifier Substitution list (the replacement list can be number, string literal, punctuation, operator, identifier, keyword, character constant.)

1: /* Cat dog case, add extra function Analysis of high jump: from concrete to abstract Cat: name, age to eat, sleep Dog: name, age to eat, sleep because there is a common function, so, extract a parent class: Animal: Name, age to eat (); sleep () {}

A good security program is 100 times times better than a seemingly concise program. It's best to find a good plan and avoid a disaster, instead of trying to find the best solution. 1, Software Construction (1) define the problem. The problem is

Original address: http://blog.sina.com.cn/s/blog_663d9a1f01017cyz.html1. Dynamic projection (ARCMAP)The so-called dynamic projection means that the spatial reference of data in ArcMap or the coordinate system is the coordinate system of the first

Recently want to write diydb, so want to draw on Libevent event mechanism. I've seen some of Libevent's code before, but it's been clean for a long time. Today take this opportunity to brush up on libevent, write a summary here.First,

ObjectiveDraw the curve you see with Geogebra, and fill the area of the boundary as solid;Implementation of the code is certainly possible, but it is not economical to use code when the graphics are too simple. Because each small change is also