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Does #if #endif act like scope?


Does #if #endif act like scope?

By : user2952917
Date : November 19 2020, 03:59 PM
it helps some times As the title hints, my question is whether the preprocessor directives #if and #endif act like a scope? Consider the example: , Now with your example just test it and you will see it:
code :
#include <stdio.h>

#define foo 1
#define bar 1

#if foo
#undef bar
#endif //foo

int main() {

    printf("%d", bar);

    return 0;  
}
[Error] 'bar' undeclared (first use in this function) 


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how is #if / #endif different than if?

how is #if / #endif different than if?


By : Dawn Uber
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further It's useful when you need two (or more) versions of your code with little difference. Then instead of keeping two projects using complier directives like #if TEST you write both versions in the same project. Then from project properties you can set value for TEST llike TEST = true and then compile the project.
code :
#if TEST
    Console.WriteLine("Hello World!");
#else
    Console.WriteLine("Goodbye World!");
#endif 
Using if() {} vs if(): endif;

Using if() {} vs if(): endif;


By : user3827417
Date : March 29 2020, 07:55 AM
wish helps you The statement are equals though for a better legibility in a Model View Controller project is better to use
code :
if(1== 1) {
    echo 'hello world';
}
<? if(1 == 1): ?>
   <div>..</div>
<? endif;?>
if {} in if: endif

if {} in if: endif


By : Jon Foster
Date : March 29 2020, 07:55 AM
To fix this issue I am not sure if I would call this is a bug, but I believe you're having this issue because of a dangling else, in conjunction with your mixed if-else syntax:
code :
if ($a == $b):            // 1
    if ($b == $c) {       // 2 
        // something      // 3
    }                     // 4
else:                     // 5 - this else
    $c = $a;              // 6
endif;                    // 7
if ($a == $b):            // 1
    if ($b == $c) {       // 2 
        // something      // 3
    };                    // 4 - here
else:                     // 5 
    $c = $a;              // 6
endif;                    // 7
RegisterMonoModules.cpp needs editing to fix error: #endif without #if #endif

RegisterMonoModules.cpp needs editing to fix error: #endif without #if #endif


By : user2966647
Date : March 29 2020, 07:55 AM
wish of those help Adapting @bjornrun's comment into an answer: in unity 4.6.9 with facebook plugin 6.2.2, I had to change both the data = lines in the code block starting on line 40 of Facebook/Editor/iOS/FixupFiles.cs to just this:
code :
data = Regex.Replace(data, @"mono_aot_register_module(mono_aot_module_mscorlib_info);", "mono_aot_register_module(mono_aot_module_mscorlib_info);");
ASP.Net C# #if/endif (how to use)

ASP.Net C# #if/endif (how to use)


By : Markypoo Schulte
Date : March 29 2020, 07:55 AM
wish of those help The #if and #endif are C# preprocessor directives. C# Preprocessor Directives are used to help in conditional compilation.
If the case of the source code you linked to, line 29 has #if SortFilterPage, and an #else on line 33, and #endif on line 35. Line 29 means if SortFilterPage is defined, then the compilation will include lines 30 to 32, and not include line 34. Similarly, the compiled code will include lines from line 117 to 168.
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