C Programming - C Preprocessor

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Exercise

"Everything should be made as simple as possible, but not simpler."

- Albert Einstein

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

#include<stdio.h>
#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.	It compiles
B.	Compiles with an warning
C.	Not compile
D.	Compiles and print nothing

In which stage the following code
#include<stdio.h>
gets replaced by the contents of the file stdio.h

A.	During editing	B.	During linking
C.	During execution	D.	During preprocessing

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