Question for Prolog Experts

This is a discussion on Question for Prolog Experts within the Tech Board forums, part of the Community Boards category; Hello all, Have a quick question. Does this code make any sense for anyone here? Code: clear:- put(27), put("["), put("2"), ...

  1. #1
    Registered User ssharish2005's Avatar
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    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

    Life is like riding a bicycle. To keep your balance you must keep moving - Einstein

  2. #2
    Registered User Codeplug's Avatar
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    27 is the ascii code for "escape". That looks like a VT100 escape sequence. Google "ESC[2J".

    gg

  3. #3
    Registered User ssharish2005's Avatar
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    haha spot on mate. I dint know about the VT100 escape sequences.

    Thanks a lot!

    ssharish
    Life is like riding a bicycle. To keep your balance you must keep moving - Einstein

  4. #4
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    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

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