C Preprocessor

Q1: What will the SWAP macro in the following program be expanded to on preprocessing? will the code compile?
#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;

A Compiles and print nothing

B Not compile

C Compiles with an warning

D It compiles

ANS:A - It compiles

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

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