[CS3304_1381] binding a logical variable to a list

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Grant Mericle (gmericle@VT.EDU)
Sat, 22 Apr 2000 09:49:43 -0400 

Message-ID:  <NEBBJHHICLFENMPAKIDPAEMMCBAA.gmericle@vt.edu>
Date:         Sat, 22 Apr 2000 09:49:43 -0400
From: Grant Mericle <gmericle@VT.EDU>
Subject:      [CS3304_1381] binding a logical variable to a list

Ex: 3+2
the list that I pass in looks like this: [[3,1],plus,[2,1]]

factor([Head|Tail], Answer) :-
                is_list(Head), Answer is Head. ??

How do I bind answer to the first element in the list ( [3,1] )?

I realize that I could write the rule as factor([Head|Tail], Head)...

but that creates problems when I have to evaluate something like "+-3".
Any pointers would be appreciated..

Grant

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