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Asked: 2026-05-17T02:51:50+00:00

What is the difference (if any) between the two following preprocessor control statements. #if

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What is the difference (if any) between the two following preprocessor control statements.

#if

and

#ifdef
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1 Answer

  1. Editorial Team

    You can demonstrate the difference by doing:

    #define FOO 0
#if FOO
  // won't compile this
#endif
#ifdef FOO
  // will compile this
#endif

    #if checks for the value of the symbol, while #ifdef checks the existence of the symbol (regardless of its value).

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