C Preprocessor

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

Answer: Option D

Explanation:

The preprocessor replaces the line #include <stdio.h> with the system header file of that name. More precisely, the entire text of the file 'stdio.h' replaces the #include directive.

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

Answer: Option C

Explanation:

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

C Preprocessor

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