#ifdef 0 Error
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Error Unterminated Ifdef
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Error Macro Names Must Be Identifiers In C
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They must begin on a separate line. Syntax: #if constant_expression #else
#endif
or
#if constant_expression #elif constant_expression
Macro Names Must Be Identifiers #define
#endif The compiler only compiles the code after the #if expression macro name must be an identifier xcode if the constant_expression evaluates to a non-zero value (true). If the value is 0 (false), then
#if 0
the compiler skips the lines until the next #else, #elif, or #endif. If there is a matching #else, and the constant_expression evaluated to 0 (false), then the http://stackoverflow.com/questions/426736/error-macro-names-must-be-identifiers-using-ifdef-0 lines between the #else and the #endif are compiled. If there is a matching #elif, and the preceding #if evaluated to false, then the constant_expression after that is evaluated and the code between the #elif and the #endif is compiled only if this expression evaluates to a non-zero value (true). Examples: int main(void) https://www-s.acm.illinois.edu/webmonkeys/book/c_guide/1.7.html { #if 1 printf("Yabba Dabba Do!\n"); #else printf("Zip-Bang!\n"); #endif return 0; }
Only "Yabba Dabba Do!" is printed. int main(void) { #if 1 printf("Checkpoint1\n"); #elif 1 printf("Checkpoint2\n"); #endif return 0; }
Only "Checkpoint1" is printed. Note that if the first line is #if 0, then only "Checkpoint2" would be printed. #if OS==1 printf("Version 1.0"); #elif OS==2 printf("Version 2.0"); #else printf("Version unknown"); #endif
Prints according to the setting of OS which is defined with a #define. 1.7.2 #define, #undef, #ifdef, #ifndef The preprocessing directives #define and #undef allow the definition of identifiers which hold a certain value. These identifiers can simply be constants or a macro function. The directives #ifdef and #ifndef allow conditional compiling of certain lines of code based on whether or not an identifier has been defined. Syntax: #define identifier replacement-code #undef identifier #ifdef identifier #else or #elif #endif #ifndef identifier #else or #elif #endif #ifdef identifier is the same is #i
resources Windows Server 2012 resources Programs MSDN subscriptions Overview Benefits Administrators Students Microsoft Imagine Microsoft Student Partners ISV Startups TechRewards Events Community Magazine Forums https://msdn.microsoft.com/en-us/library/ew2hz0yd.aspx Blogs Channel 9 Documentation APIs and reference Dev centers Retired content Samples We’re sorry. The content you requested has been removed. You’ll be auto redirected in 1 second. C/C++ Preprocessor Reference Preprocessor Preprocessor Directives Preprocessor Directives #if, #elif, #else, and #endif Directives #if, #elif, #else, and #endif Directives #if, #elif, #else, and #endif Directives must be #define Directive #error Directive #if, #elif, #else, and #endif Directives #ifdef and #ifndef Directives #import Directive #include Directive #line Directive Null Directive #undef Directive #using Directive TOC Collapse the table of content Expand the table of content This documentation is archived and is not being maintained. This documentation is archived and is not being maintained. macro names must #if, #elif, #else, and #endif Directives (C/C++) Visual Studio 2015 Other Versions Visual Studio 2013 Visual Studio 2012 Visual Studio 2010 Visual Studio 2008 Visual Studio 2005 Visual Studio .NET 2003 The #if directive, with the #elif, #else, and #endif directives, controls compilation of portions of a source file. If the expression you write (after the #if) has a nonzero value, the line group immediately following the #if directive is retained in the translation unit.Grammarconditional : if-part elif-partsopt else-partopt endif-lineif-part : if-line textif-line : #if constant-expression#ifdef identifier#ifndef identifierelif-parts : elif-line textelif-parts elif-line textelif-line : #elif constant-expressionelse-part : else-line textelse-line : #elseendif-line : #endifEach #if directive in a source file must be matched by a closing #endif directive. Any number of #elif directives can appear between the #if and #endif directives, but at most one #else directive is allowed. The #else directive, if present, must be the last directive before #endif. The #if, #elif, #else, and #endif directives can nest in the text portions of other