What is the answer?

[sachingoyal]

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

:thankyou::thankyou::thankyou:

 

[Bulan]

The answer is C:
Because, the code won't compile since statement of t cant occur within parenthesis.