Data Structures and Algorithms with Object-Oriented Design Patterns in C#
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Constructor and Purge Methods

The definitions of the QueueAsArray class constructor and Purge methods are given in Program gif. The constructor takes a single parameter, size, which specifies the maximum number of items that can be stored in the queue. The constructor initializes the fields as follows: The array field is initialized to an array of length size and the head and tail fields, are initialized to represent the empty queue. The total running time for the QueueAsArray constructor is O(n), where tex2html_wrap_inline60461.

Program: QueueAsArray constructor and Purge methods.

The purpose of the Purge method is to remove all the contents of a container. In this case, the objects in the queue occupy contiguous array positions between head and tail. To empty the queue, the Purge method walks through the occupied array positions assigning to each one the value null as it goes. Clearly, the running time for the Purge method is O(n), where tex2html_wrap_inline60465.

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