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In general, all lines in the source program are Compiled. however, Sometimes it is desirable to compile a part of the content only if certain conditions are met, that is, to specify the conditions for the compilation of some content, which is

# 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

Preprocessing is the work done prior to the first lexical scan and parsing of the compilation. To be blunt, the preprocessing part is processed before the source file is compiled, and then the processed code is compiled. The advantage of this is

The macros you encounter are for conditional compilation. In general, all rows in the source program participate in the compilation. But sometimes it is desirable to compile a portion of the content only if it satisfies a certain condition, that is,

Author: shaoyizhe2006 Original URL: http://blog.csdn.net/shaoyizhe2006/article/details/8012929 Three keywords are used in conditional statements: "Ifeq", "Else", and "endif". which 1. "Ifeq" represents the beginning of a conditional statement and

[Convert] # ifndef # define # endif usage (Arrangement) Original Author: icwk # 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

Microsoft-specific predefined Macros__cplusplus Defined for C + + programs only.This means that if you are a C + + program, useextern "C" {And this thing, refers to the following function does not use the C + + name decoration, but with C'sThe

1. Let's talk about the role of "# If 0/# If 1... # endif" first. You have mentioned a little bit above, but you have not mentioned any key points. We know that the C standard does not provide single-line style annotations such as "//" in C ++, but

For example: to write a header file test.h #ifndef _test_h #define _TEST_H//is typically an uppercase file name ············ #endif 1. For example, you have two C files, and all two C files include the same head file. At compile time, the two C

Alternative syntax in PHP (colon, endif, Endwhile, ENDfor)reprinted October 07, 2012 09:48:10 Label: PHP/ WordPress/ Html 16096 We often see a lot of strange php syntax in the wordpress template of a blog

Original articles, reproduced please indicate the source, thank you.Author: Qing Lin, blog name: Flying Air and static crossing #if语句 #if语句会计算它后面的表达式, and checks the result of the expression, if the result is true (true), the subsequent statement

Preprocessor commands are very powerful and are used extensively during programming, such as easy to use in version release, 1, #define (tells the compiler that there is a symbol for the given name) #undefine (delete symbol) 2,

#ifndef the use of #define#endif#ifndef in the fileThe #ifndef of the first piece, this is a very important thing. For example, you have two C files, and these two C files include the same header file. At compile time, these two C files are compiled

# 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

Tag:io    use    sp   on    file    div    bs    code    ad    First, let's start with the beginning of the file, in a lot of header files, we will see this statement #ifndef _myheadfile_h #define _MYHEADFILE_H//.... Statement ...

If () endif substitution syntax If (expression ): ?> Statement Endif ?> The above is an alternative syntax for php process control.PHP process control includes the

In PHP, what are colon, endif, endwhile, and endfor? endwhileendfor. What are colon, endif, endwhile, and endfor in PHP? we often see many strange PHP syntaxes in the templates of wordpress blog programs, such :? In php, what are colon, endif,

After learning openCV, I tried to run the online routine on the local machine and encountered various problems, so I recorded them for reference. For VS2008, multiple projects can be created in one solution, but the unpleasant thing is that -- 1.

1. "# If 0/# If 1... # endif ", we know, the C standard does not provide single-line style annotations such as "//" in C ++, but only provides block annotation functions such, we usually use it to write descriptive comments (comments) in the Code

1. #pragma once is used to prevent a head file from being include multiple times; #ifndef, #define, #endif用来防止某个宏被多次定义. 2. #pragma once is compile-related, which means it can be used on the compilation system, but not necessarily in other compiling