Question for Prolog Experts

Hello all,

Have a quick question. Does this code make any sense for anyone here?

Code:

---

clear:-
    put(27),
    put("["), 
    put("2"),
    put("J").

---

This code seems to be doing something clever. But I can’t figure it out how. It sees like that there is an internal code which is understood by the SWI-Prolog. Then ties to clears the current screen.

Any explanation?

Thanks a lot!

Ssharish

27 is the ascii code for "escape". That looks like a VT100 escape sequence. Google "ESC[2J".

gg

haha spot on mate. I dint know about the VT100 escape sequences.

Thanks a lot!

ssharish

I think there was even a bug in some windows version where code like this would make the system hang. Or maybe that was with backspaces dont remember