C/C++ program that prints its own source code as its output

Wikipedia says it's called a quine and someone gave the code below:

char*s="char*s=%c%s%c;main(){printf(s,34,s,34);}";main(){printf(s,34,s,34);}

But, obviously you have to add

#include <stdio.h> //corrected from #include <stdlib.h>

so that the printf() could work.

Literally, since the above program did not print #include <stdio.h>, it is not a solution (?)

I am confused about the literal requirement of "print its own source code", and any purpose of this kind of problems, especially at interviews.