In implementing a Queue using an array, a problem might arise if the Queue is implemented in such a way that items in the Queue are inserted at the next available location and removed from the next leading position, but such that, once deleted, the emptied space is unused. The problem that arises is one where there is free space still in the array, but it is not usable because it is not at the end.
In implementing a Queue using an array, a problem might arise if the Queue is implemented in such a way that items in the Queue are inserted at the next available location and removed from the next leading position, but such that, once deleted, the emptied space is unused. The problem that arises is one where there is free space still in the array, but it is not usable because it is not at the end.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Transcribed Image Text:d. In implementing a Queue using an array, a problem
might arise if the Queue is implemented in such a
way that items in the Queue are inserted at the next
available location and removed from the next leading
position, but such that, once deleted, the emptied
space is unused. The problem that arises is one
where there is free space still in the array, but it is not
usable because it is not at the end.
Demonstrate this problem with a Queue that is stored
in an array of size 5 for the following instructions.
Next, explain how you might resolve this problem.
Queue q
constructor takes 5 as the size of the array
= new Queue(5);
// assume the Queue
q.enqueue(3);
q.enqueue(4);
q.enqueue(1);
q.dequeue( );
q.dequeue( );
q.enqueue(6);
q.enqueue(5);
q.dequeue( );
// at this point,
// there are only 2 item2
in the queue
q.enqueue(7);
// this enqueue can not
occur, why??
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