clover definition

which is processed by the system reference preprocessor, and the preprocessing part refers to the preprocessing commands that start with "#", which is placed outside the function, and generally placed in front of the source file, such as: command #include, Macro command #define, etc. The reasonable use of preprocessing functions can make the program more convenient to read, modify, transplant, debug, and also conducive to modular programming. This article mainly describes the following sections

The difference between a variable declaration and a definitionWe are in the program design, always use the definition of variables and the declaration of variables, but sometimes we are not very clear about the concept, know how it is used, but do not know how a thing, the following I will simply introduce their differences are as follows: (Hope my guidance to you benefit)There are two scenarios for declaring a variable:1, one is the need to set up st

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

Although the definition is also a declaration, in order to facilitate the explanation of the problem, the Declaration below is only a simple declaration, and the definition is just a definition.1. the terms declaration, definition, initialization, and assignment are essentially different. Although they sometimes look s

C + + Primer Learning Notes _15_ class and Data Abstraction (1) _ Class definition and declarationIn C + +, classes are used to define their own abstract data types. By defining types to correspond to the various concepts in the problem to be solved, we can make it easier to write, debug, and modify programs. You can make your own defined data types as easy and intuitive as the built-in types.Take a look at the Sales_item class:Class Sales_item{privat

I am using a template-based library source code, which contains some template function features for specific types. Class templates, function templates, and template function features are all included in the header file. I am in my. cpp File # Include the header file and compile the link project. However, to use this library throughout the project, I include the header file in stdafx. h. . How can I organize header files to avoid multiple symbol definition