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Implement the specification for an integer function

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Implement the following specification for an integer function in the client program that returns the number of items in a queue. The queue is unchanged.

int GetLength(QueType queue)
Function: Determines the number of items in the queue.
Precondition: queue has been initialized.
Postconditions: queue is unchanged.
Function value = number of items in queue.

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The solution gives a complete C++ code to implement the given specification for an integer function in the client program that returns the number of items in a queue which is unchanged.

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