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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

in our previous article, we introduced the use of PHP define examples, I believe that we have a certain understanding of define, today we introduce you to the PHP constant define and the difference between const detailed! A constant is a simple identifier. This value cannot be changed during script execution (in addition to the so-called magic constants, they a

Difference between typedef and # define ------ [Badboy ], Typedef and # define are commonly used to define the alias of an identifier and a keyword, but there is a key difference between them. Typedef is part of the language compilation process; # Define is a macro Definition Statement, which is not carried out during

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

Const and define all define constants in PHP, but what are their specific differences? In fact, very simple const is used for the definition of a class member variable, once defined and cannot change its value. Define defines a global constant that can be accessed anywhere the page define cannot be defined in the class

C # preprocessor directives are never translated into executable code commands, but can affect all aspects of the compilation process, common preprocessor directives have # define, #undef, #if, #elif, #else和 #endif, and so on, the following describes C # use # Define an instance of conditional compilation.In C #, conditional compilation directives are used to conditionally include or exclude portions of a s

# DefineCreate a macro that is an identifier or parameterized identifier associated with the tag string. After defining the macro, the compiler can mark a string to replace each matching item of the identifier in the source file.Syntax # DefineIdentifierToken-string # DefineIdentifier(Identifier1,...,IdentifierN)Token-stringRemarks 1 # defineCommand to enable the CompilerToken-stringReplacing the source fileIdentifier. Only whenIdentifierIt is replaced only when a tag is formed. That is to say,

Usage of "#" and "#" in macroI. general usageWe use # to convert the macro parameter into a string, and # to combine the two macro parameters.Usage:# Include# IncludeUsing namespace STD; # Define STR (s) # s# Define cons (a, B) int (A ## e ## B) Int main (){Printf (STR (vck); // output string "vck"Printf ("% d/N", cons (2000); // 2e3 output:Return 0;} 2. When the macro parameter is another macroIt should be

A constant is a simple identifier. This value cannot be changed during script execution (in addition to the so-called magic constants, they are not constants). Constants are case sensitive by default. Usually, constant identifiers are always uppercase.You can use the Define () function to define constants. After php5.3.0, you can use the Const keyword to define c

The difference between define () and const: Define () defines constants during the execution period, while Const defines constants at compile time. This will have a slight speed advantage (ie a slightly better performance), but it is not worth considering unless you are building a large, high concurrency system. Define () puts constants into the global scope, e

This article to share the content is detailed in the PHP constant: Define and const difference, has a certain reference value, the need for friends can refer to A constant is a simple identifier. This value cannot be changed during script execution (in addition to the so-called magic constants, they are not constants). Constants are case sensitive by default. Usually, constant identifiers are always uppercase. can be used

"Q" When defining constants in PHP, what is the difference between const and define? The "answer" uses the const to make the code easy to read, and the const itself is a language structure, and define is a function. In addition, const is much faster to compile than define. (1). Const is used to define a class member v

1. const is used for defining class member variables. once defined, the value cannot be changed. Define defines global constants that can be accessed anywhere. 2. define cannot be defined in the class, but const can. 3. const cannot define the constant if (...) {constFOO amp; #39;... SyntaxHigh in the condition statement. 1. const is used for defining class memb

# Ifndef # define # endif usage, # Ifndef # define # endif usage # Ifndef # Ifndef in the header, which is critical. For example, you have two C files, both of which include the same header file. During compilation, these two C files need to be compiled into a runable file together, so the problem arises and a large number of declarations conflict. Put the header file content in # ifndef and # endif. Wheth