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#ifndef, (or #ifndef), #def, #endif等宏这几个宏是为了进行条件编译. 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

There is only one sentence in a page that can be judgedWe often see the form in the HTML of the page like [if LTE IE 9] ... The code for [ENDIF] represents a statement that restricts certain browser versions to execute, so what are the rules for

We often use WordPress blogs.ProgramThe template contains many strange PHP syntaxes, such: Empty For a considerable number of PHP enthusiasts, what are these things? Are those blog developers doing their own PHP-like template languages?None. In fact,

we often see a lot of strange in the template of WordPress kind of blog programPHP syntax , such as: Empty For a lot of PHP enthusiasts have never seen Ah, what are these things? Are those blog developers doing their own php-like template

ie6 and the following versions are visible ie7 and the following versions are visible only IE6 version visible except IE version ie7 and versions larger than IE7 are visible usage: (1) You can use the following code to detect the current version

We often see a lot of strange php syntax in a wordpress-like blog program template, such as: The Empty For a considerable part of the PHP enthusiasts have never seen, what are these things? Is it the blogging developer's own template

We often see a lot of strange php syntax in the wordpress template of a blog program, such as: Copy CodeThe code is as follows: The empty For a lot of PHP enthusiasts have never seen Ah, what are these things? Are those blog developers

1. # define and # UNDEF define or cancel defining condition compilation symbols 2. # If, # Elif, # else and # endif are used to skip based on conditions.Source codeSection 3. # ifdef, # ifndef determine whether the symbol is defined 4. # error,

We often see the form in the HTML of the page like [if LTE IE 9] ... The code for [ENDIF] represents a statement that restricts certain browser versions to execute, so what are the rules for these judgment statements? Please see below: In addition

In any language, in general, the most common contact is the IF statement, but more complex than the IF statement is the following statement: If ... ElseIf ... ElseIf ... EndIf, of course, this statement can be unrestricted to add a variety of

# If _ MSC_VER> 1000# Pragma once# EndifExplanation:This is Microsoft's pre-compilation control.When _ MSC_VER is relatively small, it supports something different from the new version. _ MSC_VER:MS: Microsoft (Microsoft) AbbreviationC: MSC is

Some of the following uses have never been seen by a considerable number of PHP enthusiasts. What are these things? We often see many strange PHP syntaxes in the templates of wordpress blog programs, such: The code is as follows: Empty For

# Ifndef # define # endifAnimal. h // class animal {public: Animal ();~ Animal (); void eat (); void sleep (); Virtual void breathe () ;}; animal. CPP // Implementation of the member functions in the class contained in the source file # include

We often see a lot of strange php syntax in a wordpress-like blog program template, such as: Empty For a considerable part of the PHP enthusiasts have never seen, what is these things? Is it the blogging developer's own template language for PHP?

We often see a lot of strange php syntax in the wordpress type Blog program template, such as: Copy Code code as follows: Empty For a considerable part of the PHP enthusiasts have not seen Ah, what are these things?

In WordPress a kind of blog program template inside see a lot of strange PHP syntax, such as: The code is as follows Copy Code Empty For a considerable part of the PHP enthusiasts have not seen Ah, what are

/*File: String. h# Ifndef _ linux_string_h _# DEFINE _ linux_string_h _ /* We don't want strings. h stuff being user by user stuff by accident */ # Ifdef _ KERNEL __ # Include /* For size_t */# Include /* For null */# Include /* for inline

Preface 2017.01 Uboot contains two stages of start-up, one is SPL-initiated, and the other is a normal start-up we call the second stage of Uboot. Of course, we can also choose to use SPL and not to use it. In the process of compiling, the second

Stdlib. H Content/**** Stdlib. H-declarations/definitions for commonly used library functions** Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.** Purpose:* This include file contains the function declarations for commonly* Used

Sometimes, to write some programs, in JAVA is very difficult to implement, but if the use of other programming languages but it is relatively easy, we might as well through the JNI to let the different languages of the program to do together.JNI