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<HTML><HEAD><TITLE>Answer to Exercise 29</TITLE></HEAD>
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<TABLE><TR><TD Valign="top"><IMG SRC="../icons/exercise.gif" ALT="??"><TD bgcolor="#FAA89B"><B>ANSWER TO EXERCISE 29</B><TR><TD><TD>
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Object Zen "Zen" Flight_Deck
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with name "zen" "flight" "computer",
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initial "Square lights flicker unpredictably across a hexagonal
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fascia on one wall, indicating that Zen is on-line.",
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grammar [; return -'zen,'; ],
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[; Show: "The main screen shows a starfield,
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turning through ", noun, " degrees.";
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Go: "~Confirmed.~ The ship turns to a new bearing.";
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SetTo: if (noun==0) "~Confirmed.~ The ship comes to a stop.";
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if (noun>12) "~Standard by ", (number) noun,
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" exceeds design tolerances.~";
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"~Confirmed.~ The ship's engines step to
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standard by ", (number) noun, ".";
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Take: if (noun~=force_wall) "~Please clarify.~";
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"~Force wall raised.~";
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Drop: if (noun~=blasters) "~Please clarify.~";
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"~Battle-computers on line.
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Neutron blasters cleared for firing.~";
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NotUnderstood: "~Language banks unable to decode.~";
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default: "~Information. That function is unavailable.~";
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has talkable proper static;
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Object -> force_wall "force wall" with name "force" "wall" "shields";
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Object -> blasters "neutron blasters" with name "neutron" "blasters";
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Verb "zen," * "scan" number "orbital" -> Show
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* "set" "course" "for" Planet -> Go
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* "speed" "standard" "by" number -> SetTo
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* "raise" held -> Take
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* "clear" held "for" "firing" -> Drop;
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Dealing with <TT>Ask</TT>, <TT>Answer</TT> and <TT>Tell</TT> are left to the reader.
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<HR>Back to <A HREF="../section16.html#ex29">the exercise in section 16</A><HR>
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