what define

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 3.141

1. Define (that is, host variable)The main role of the host variable is to act as an alternative variable, a medium in which the host environment can interact with Oracle . When you define a host variable by define, you must specify the variable

#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,

Macro definition in many languages can see its shadow, C #, C++,c, and so on, especially the system API inside a lot of macro definition, looking very bluffing people. Reasonable use of macro definition, you can make your code look more standardized,

Definition: The # define Directive You can use the # define directive to give a meaningful name to a constant in your program. The two forms of the syntax are: Syntax # Define identifier token-stringopt # Define identifier [(identifieropt,...,

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

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

As we all know, in PHP (PHP 4 and later), we can use the function define () to define constants, for example: However, after PHP 5.3.0, in addition to using function define (), we can also use the PHP keyword const to define constants. For example:

#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,

Thanks to http://blog.chinaunix.net/u3/111961/showart_2187819.html first . This is an excellent article. In the last study, we wrote a small client example, which is very simple and the header file generated by using producer-binding-tool is very

The Define () function defines a constant.define () functions: Defines a constant. Constants is much like variables, except for the following differences: constants [constant] and variables [variable] There are many similarities, so it is easy to

Http://blog.sina.com.cn/s/blog_686188ef0100klku.html#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

#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,

Let's look at a few examples (1) struct{int x; int y;} Test1; Well, define the structure test1, test1.x and test1.y can be used in the statement. (2) struct test {int x; int y;} Test1; Well, define the structure test1, test1.x and test1.y can be

1. # difference between define and typedef # Define is generally used to define constants and statement macro definitions and act as macro replacement during compilation. Of course, you can also complete a small part of the typedef function.

ExtJS learning ------- Ext. define alias and slave name, two methods to define static methods, mixed attributes and other attributes (1) Ext. define alias and backup name Ext. onReady (function () {Ext. define ('user', {config: {name: 'zhang san',

First, the constPHP5.3 Previously, const can only declare variables inside a class, 5.3+ allows variables to be declared externally, but cannot be evaluated with constants!Const one = 1; Const WORD = ' Hello World ';PHP5.6 Start, const supports

# 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

Reprinted from: Http://www.yonsm.net/read.php? 141 The version number may be used in many places in a VC project, such as the about dialog box and version resource. Changing these values one by one for each version is not only troublesome, but

: This article mainly introduces the difference between const and define in php (supplement). If you are interested in PHP tutorials, refer to it. A constant is the identifier (name) of a simple value ). As its name implies, this value cannot be