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Discussion :: C Preprocessor

  1. What will the SWAP macro in the following program be expanded to on preprocessing? will the code compile?

     #include
 #define SWAP(a, b, c)(c t; t=a, a=b, b=t)
  int main() 
  {     
      int x=10, y=20;  
      SWAP(x, y, int);  
      printf("%d %d\n", x, y);      
      return 0;
 }

     

    2. A.

    It compiles
    B.

    Compiles with an warning
    C.

    Not compile
    D.

    Compiles and print nothing

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    View Answer

    Answer : Option C

    Explanation :

    The code won't compile since declaration of t cannot occur within parenthesis.

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