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<HTML><HEAD><TITLE>Answer to Exercise 19</TITLE></HEAD>
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<TABLE><TR><TD Valign="top"><IMG SRC="../icons/exercise.gif" ALT="??"><TD bgcolor="#FAA89B"><B>ANSWER TO EXERCISE 19</B><TR><TD><TD>
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Add the following lines, after the inclusion of <TT>Grammar</TT>:
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[ SayInsteadSub; "[To talk to someone, please type ~someone, something~
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or else ~ask someone about something~.]"; ];
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Extend "answer" replace * topic -> SayInstead;
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Extend "tell" replace * topic -> SayInstead;
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A slight snag is that this will throw out "nigel,
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tell me about the grunfeld defence'' (which the library will normally
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convert to an <TT>Ask</TT> action, but can't if the grammar for "tell'' is
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missing). To avoid this, you could (instead of making the above
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directives) <TT>Replace</TT> the <TT>TellSub</TT> routine (see <A HREF="section21.html">Section 21</A>)
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by the <TT>SayInsteadSub</TT> one.
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<HR>Back to <A HREF="../section16.html#ex19">the exercise in section 16</A><HR>
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