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Define () function understanding 1 (focusing on the understanding of the function)The Define () function defines a constant.Characteristics of constants:Constants are similar to variables, except that, after setting, the value of a constant cannot change the constant name, does not require a dollar sign ($) at the beginning, and the scope does not affect access to the constant, which can only be a string or

This article really does not have any difficulty, I am in order to test my English level degenerated not haha although my English originally had the dregs to translate also like plain English. Will read the original version of the code after the translation of almost one hours, in which the comments are part of their own understanding of the omission or misunderstanding is also grateful to the place, such as JavaScript in the understanding of a single example of the sense of the definition of a

In iOS development, macro definitions are often used, or some data types are modified with const, and often developers do not know how to use them correctly, resulting in the confusion of macros and const decorations in the project.Can you distinguish between the following? Do you know when to use it?#define Hscoder @ "Hansha haha"NSString *hscoder = @ "Hansha haha";extern NSString *hscoder;extern const NSString *hscoder;static const NSString *hscoder

In C + +, we can define the so-called symbolic constants by #define This instruction, which is directly compiled into binary code. In this case, it is basically the same as the effect of the constant value variable defined with Const. Of For example: But #define also has the function of changing compiler behavior, for example, depending on whether or not yo

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 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 rea

#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

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 used in the statement. Compared with 1, the province wrote Test (3) typedef struct TEST {int x; int y; } TEXT1,TEXT2; Only said that the structure of the (

: 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 changed during script execution (except for so-called magic constants, they are actually not constants ). Constants are case sensitive by default. Constant identifiers are always capitalized. You can use the

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

There is a constant DATA_PATH, and a string quot; file_name quot; how to define a variable in the class (the constant seems to need 5.7), which indicates DATA_PATH and quot; file_name quot;. I can define it outside the class as follows: {code ...} but it won't work in the class: {code ...}... there is a constant DATA_PATH and a string "file_name" How to define