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[QUOTE="Robert, post: 3046277"]
I fix the bug by myself. the main.cpp change as bellow:
	while (average_wait > 1)
	{
		perhour = rand() % 50 + 1;
		min_per_cust = MIN_PER_HR / perhour;
		line_wait = 0;

for (long cycle = 0; cycle < cyclelimit; cycle++)
		{
			if (newcustomer(min_per_cust))
			{
				if (line.isfull())
					turnaways++;
				else
				{
					customers++;
					temp.set(cycle);
					line.enqueue(temp);
				}
			}

if (wait_time <= 0 && !line.isempty())
			{
				line.dequeue(temp);
				wait_time = temp.ptime();
				line_wait += cycle - temp.when();
				if (line_wait < 0 )
				{
					cout << "line_wait overfolw " << endl;
					break;
				}
				served++;
			}

if (wait_time > 0)
				wait_time--;

sum_line += line.queuecount();
		}

while (!line.isempty())
			line.dequeue(temp);

if (served)
		{
			if ( line_wait < 0 || served < 0 )
				int t = 100;
			average_wait = (double)line_wait / served;
			cout << " line wait: " << line_wait << endl;
			cout << "  customers served: " << served << endl;
			cout << " average wait time: " << average_wait << "minutes\n";
		}

//cout << " average wait time: " << average_wait << endl;

served = 0;
		turnaways = 0;
		sum_line = 0;
		wait_time = 0;
		line_wait = 0;
	}

if (customers > 0)
	{
		cout << "customers accepted: " << customers << endl;
		cout << "  customers served: " << served << endl;
		cout << "         turnaways: " << turnaways << endl;
		cout << "average queue size: ";
		cout.precision(2);
		cout.setf(ios_base::fixed,ios_base::floatfield);
		cout.setf(ios_base::showpoint);
		cout << (double) sum_line / cyclelimit << endl;
		cout << " average wait time: " << average_wait << "minutes\n";
		cout << "the average number of customers per hour" << perhour <<
endl;
	}
	else
		cout << "No customers!\n";
}
}
[/QUOTE]

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