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Simulated bank calling system. Use basic queue operations. Suppose a bank has five service windows, a unified calling system. In the service period, the number per unit of time with random arrival of customers, each customer to get a new sequence number, into the service queue, waiting, waiting for called. The staff of each service window treatment complete a customer s business, the customer immediately left, the staff calls the next customer, the next window displays a customer service number. Then be called customer service number. Assume that each customer needs service hours is also random. The design process simulation test scenarios.