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What is a class constant? What we can understand in PHP is that the value is constant, so what is a class constant? In fact, the class constants are also easy to understand, we can always keep the constant value of the class is called constants, and this constant can be called the class constant. Be sure to remember that you do not need to use the "$" symbol when defining and using constants. A class constant belongs to the class itself, not to an object instance, and cannot be accessed through

file of the class Person.h (which is usually done in this file), There is also a person.m file, which is generally implemented as defined in the header file. This is also a continuation of the C language of the project structure it. General header files are only responsible for defining functions, and. c files are responsible for implementing specific functions. It's similar here.Here's a look at the definition format for the class in the Person.h he

"0" written in front0.1) The purpose of this code:The purpose of this text is to explain the function of the local descriptor, its definition, initialization and jump, etc.0.2)The personal summary at the end of the article is dry, the preceding code is for reference only, and source code from Orange's implemention of a OS.0.3)Since the code in this article and the "Steps of the real mode and protected mode switching" source code has a similarity of 90

Always thought that my C language can still, although not superb, but at least more familiar with it. But a while ago read a tweet, and then Baidu a bit of C language is not the exact type. Found me. C language is not completely type and the use of a very wide range of delay definitions have no concept. These two days looked closely at the relevant concepts and experimented with the code.This article is structured as follows: Introduction to the concept of non-complete type of C languag

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

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: 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

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

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