C Programming Questions and Answers:: C Preprocessor

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;
}
A. It compiles
B. Compiles with an warning
C Not compile
D. Compiles and print nothing

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

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

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; }

A. It compiles
B. Compiles with an warning
C Not compile
D. Compiles and print nothing