implementation of a queue using a circular array

Posted by matin1234 on Stack Overflow See other posts from Stack Overflow or by matin1234
Published on 2010-06-05T15:58:24Z Indexed on 2010/06/05 16:02 UTC
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java

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data-structures

Hi I have found these algorithms in the internet but I can not understand that why in the enqueue method we compare size with N-1??? please help me thanks!!

Algorithm size():
return (N-f+r)mod N



Algorithm enqueue(e):
if size()=N-1 then
   throw a FullQueueException
Q[r]<---e
r<----(r+1)mod N

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