Chapter 18, Problem 7PC

Program Plan Intro

Queue Exceptions

Program Plan:

“main.cpp”:

• This program features queues that can throw exceptions and print an appropriate error message and should terminate the program.
• Include the required header files.
• Prompt the user to enqueue 5 items.
• Use of try – catch exceptional handling that returns error message and terminates the program if the queue overflows.
• Prompt the user and allow user option to overflow the queue and dequeue the queue and print the values present in the queue.

“IntQueue.h”:

• Include all the required header files.
• Declare all the variables present in the queue along with their data types.
• Declare all the function definition.
• Declare the class underflow and overflow to check for exceptional handling in queue.

“IntQueue.cpp”:

• Include all the required header files.
• Call a constructor to create a queue and initialize its elements.
• Initialize front and rear each to -1 and the number of elements initially present to 0.
• A destructor is called to delete the queue array.
• Define a queue function enqueue that inserts the value in variable num at the rear of the queue.
• Define a queue function dequeue that deletes the value at the front of the queue, and copies it into variable.
• Define a queue function isEmpty returns true if the queue is empty, and false if elements are present in the queue.
• Define a Queue function is Full return true if queue is full and false if queue is not full.