(C++ Intro to Programming 2). Any help would be much appreciated. I think I got

Question

(C++ Intro to Programming 2). Any help would be much appreciated. I think I got the first part right but I'm not sure and I also was wondering how to do the second part. Thank you in advance.

//--------------------------------------------------------------------
// file: storesim.cpp
//--------------------------------------------------------------------

// Simulates the flow of customers through a line in a store.
// makes use of queues.

#include <iostream>
#include <iomanip>
#include <cstdlib>
#include "queuelnk.cpp"

using namespace std;

void main()
{
   Queue<int> custQ; // Line (queue) of customers containing the
                       // time that each customer arrived and
                       // joined the line
   int simLength, // Length of simulation (minutes)
       minute, // Current minute
       timeArrived, // Time dequeued customer arrived
       waitTime, // How long dequeued customer waited
       totalServed = 0, // Total customers served
       totalWait = 0,   // Total waiting time
       maxWait = 0,   // Longest wait
       numArrivals = 0;

   cout << endl
       << "Enter the length of time to run the simulator : ";
   cin >> simLength;

   for (minute = 0; minute < simLength; minute++)
   {
       if (!custQ.isEmpty())
       {
           //* Add code here to do the following:
           //* 1) dequeue the first customer and capture its return
           //* in timeArrived
           //* 2) increment totalServed
           //* 3) calculate the waitTime of the customer
           //* 4) add the waitTime of the customer to totalWait
           //* 5) update maxWait if this customer waited longer than any
           //*    previous customer.

           timeArrived = custQ.dequeue();
           waitTime = minute - timeArrived;
           totalServed++;
           totalWait += waitTime;
           if (waitTime > maxWait)
               maxWait = waitTime;
       }

       switch (rand() % 4)
       {
           // The number generated above will be between 0 and 3
           // If 0 or 3, then no customers will be added, If 2, then 2
           // customers will be added. If 1, then one customer will be added.

       case 0:
       case 3: numArrivals = 0; break;
       case 1: numArrivals = 1; break;
       case 2: numArrivals = 2;
       }
       for (int j = 0; j < numArrivals; j++)
           custQ.enqueue(minute);

   }

   cout << endl;
   cout << "Customers served : " << totalServed << endl;
   cout << "Average wait : " << setprecision(2)
       << double(totalWait) / totalServed << endl;
   cout << "Longest wait : " << maxWait << endl;

}

Explanation / Answer

Here is the modified code any issues please let me know:

#include <iostream>
#include <iomanip>
#include <cstdlib>
#include <ctime>
using namespace std;
int main ()
{
QueueLinked<int> custQ;
QueueArray<int> custQ;   
int simLength,   
minute,   
timeArrived,   
waitTime,
totalServed = 0,   
totalWait = 0,   
maxWait = 0,   
numArrivals = 0;   
srand( time(NULL) );
cout << endl << "Enter the length of time to run the simulator : ";
cin >> simLength;
minute = 0;
int k;
while(minute <= simLength)
{
minute++;
int custTemp = 0;
if(!custQ.isEmpty())
{
timeArrived = custQ.dequeue();
waitTime = minute - timeArrived;
totalWait += waitTime;
totalServed++;
if(waitTime > maxWait)
{
maxWait = waitTime;
}
timeArrived = custTemp;
}
k = rand() % 4;
if(k == 1 )
{
numArrivals++;
}
else if (k ==2)
{
numArrivals+=2;
}
for(int x = 0; x < numArrivals; x++)
{
custQ.enqueue(minute);
}
numArrivals=0;
}
cout << endl;
cout << "Customers served : " << totalServed << endl;
cout << "Average wait : " << setprecision(2)<< double(totalWait)/totalServed << endl;
cout << "Longest wait : " << maxWait << endl;
return 0;
}

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