Question: 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; }
1. It compiles
2. Compiles with an warning
3. Not compile
4. Compiles and print nothing
Can you answer what will the SWAP macro?