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Error in my recursive pseudo code

pseudo code pseudocode recursive

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#1 Monster92


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Posted 05 February 2012 - 02:52 PM

Ok I have written a program samelist(List1, List2). IT is supposed to check two lists for equality. However whenever I try to implement it in Java it doesn't work. A friend told me it is with the pseudo code I have written shown below. There's a mistake there but I cannot see it. Sorry again to be cheeky but if you find a way to correct can you provide an example of how it would work?

samelist(L1,L2) {  
if(L1==[] and L2==[]) return true;
	else return (head(L1)==head(L2) and samelist(tail(L1), tail(L2))); 

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#2 Sysop_fb


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Posted 05 February 2012 - 02:58 PM

I don't see any form of returning false in your psuedo code also you don't need to keep doing a return statement.
If end of list then return true
else If head of list a == head of list b then recursively call function with tail of lists
else return false

You basically end up using if statements as a type of pattern matching. When doing pattern matching you need to have a pattern for every logical potential.
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#3 Monster92


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Posted 05 February 2012 - 03:05 PM

I'm apologize for my ignorance I don't see how that could be written. I'm new to the idea of pseudo code and programming at large
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Also tagged with one or more of these keywords: pseudo code, pseudocode, recursive

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