Tricky C Code

Okay many might have seen this but this is just for the beginners . Try to get the answer without compiler

Code:

 
#include<stdio.h>
main()
{
      int i=9;
      printf("%d",++i + ++i + ++i);
}

If you don't know the answer then you can either ask me or compile it or either search it on google.  :pepeclown2:  

= 12  :kekw:
:awhat: