ifdef in C

Question

I would like to do the below but in C  instead of C     ifdef  DEBUG bool bypassCheck TRUE OR FALSE   i will decide depending on what i am debugging  else bool bypassCheck   false    NEVER bypass it  endif

User · Answer

if DEBUG bool bypassCheck TRUE OR FALSE   i will decide depending on what i am debugging  else bool bypassCheck   false    NEVER bypass it  endif   Make sure you have the checkbox to define DEBUG checked in your build properties

User · Answer

I would recommend you using the Conditional Attribute   Update  3 5 years later  You can use  if like this  example copied from MSDN       preprocessor if cs  define DEBUG  define VC V7 using System  public class MyClass        static void Main           if  DEBUG  amp  amp   VC V7          Console WriteLine  DEBUG is defined     elif   DEBUG  amp  amp  VC V7          Console WriteLine  VC V7 is defined     elif  DEBUG  amp  amp  VC V7          Console WriteLine  DEBUG and VC V7 are defined     else         Console WriteLine  DEBUG and VC V7 are not defined     endif           Only useful for excluding parts of methods   If you use  if to exclude some method from compilation then you will have to exclude from compilation all pieces of code which call that method as well  sometimes you may load some classes at runtime and you cannot find the caller with  Find all references    Otherwise there will be errors   If you use conditional compilation on the other hand you can still leave all pieces of code that call the method  All parameters will still be validated by the compiler  The method just won t be called at runtime  I think that it is way better to hide the method just once and not have to remove all the code that calls it as well  You are not allowed to use the conditional attribute on methods which return value - only on void methods  But I don t think this is a big limitation because if you use  if with a method that returns a value you have to hide all pieces of code that call it too   Here is an example            calling Class1 ConditionalMethod   will be ignored at runtime         unless the DEBUG constant is defined       using System Diagnostics      class Class1                Conditional  DEBUG           public static void ConditionalMethod               Console WriteLine  Executed Class1 ConditionalMethod                      Summary   I would use  ifdef in C   but with C  VB I would use Conditional attribute  This way you hide the method definition without having to hide the pieces of code that call it  The calling code is still compiled and validated by the compiler  the method is not called at runtime though  You may want to use  if to avoid dependencies because with Conditional attribute your code is still compiled

User · Answer

C  does have a preprocessor   It works just slightly differently than that of C   and C   Here is a MSDN links - the section on all preprocessor directives

[c#] #ifdef in C#

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