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<HTML><HEAD><TITLE>Answer to Exercise 3</TITLE></HEAD>
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<TABLE><TR><TD Valign="top"><IMG SRC="../icons/exercise.gif" ALT="??"><TD bgcolor="#FAA89B"><B>ANSWER TO EXERCISE 3</B><TR><TD><TD>
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Briefly: provide a <TT>GamePreRoutine</TT> which tests to see if
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<TT>second</TT> is an object, rather than <TT>nothing</TT> or a number. If it is,
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check whether the object has a <TT>second_before</TT> rule (i.e. test the
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condition <TT>(object provides second_before)</TT>). If it has, send the
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<TT>second_before</TT> message to it, and return the reply as the return
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value from <TT>GamePreRoutine</TT>.
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<HR>Back to <A HREF="../section9.html#ex3">the exercise in section 9</A><HR>
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