Hi! Firstly thanks for reading my post.

I am a newbie to pascal and would like to know something about
double-ended queue implementation by linear array.

Front ->   OOOOO  <-  Rear
                123456

1) I assume that AppendRear is normal operation but what are other
conditions to consider?

2) If procedure AppendFront is to be done, how to if an element is in
position '1'?

3) Assuming ServeFront is the same as normal queue or poping a stack,
what about Serving from the Rear? Again, what are the conditions to
apply?

Thanks in Advance

- Alf  (doing the quarterly 10-minute anti-homework-request crusade).