1. C programming in Bengali
  2. C Preprocessor এর ব্যবহার ও উপযোগিতা
  3. Question and Answer

Question and Answer

Submitted by tushar pramanick on Mon, 03/11/2013 - 00:12
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    Q Is the C preprocessor part of the C compiler?

    A No. The C preprocessor is not part of the C compiler. With its own line-oriented grammar and syntax, the C preprocessor runs before the compiler in order to handle named constants, macros, and inclusion of files.

    Q How do you remove a macro name?

    A By putting a macro name after the #undef directive, the macro name can be removed. According to the ANSI C standard, a macro name has to be removed before it can be redefined.

    Q Why do you need the #endif directive?

    A The #endif directive is used with an #if, #ifdef, or #ifndef directive because statements under the control of a conditional preprocessor directive are not enclosed in braces ({ and }). Therefore, #endif must be employed to mark the end of the block of statements.

    Q Can the conditional expression following the #if directive be an arithmetic expression?

    A Yes. The conditional expression evaluated by the #if directive can be an arithmetic expression. If the expression returns a nonzero value, the code between the #if directive and the next nearest directive are included for compilation. Otherwise, the code is skipped.
 

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