The following code simulates customers at a bank using the data below. Explain h

Question

The following code simulates customers at a bank using the data below. Explain how the program works as well as you can from exploring the code. Append your run results to your answer.

//Bank simulation

#include <iostream>
#include <cstdlib>
#include <queue> //

using namespace std;

int option(int percents[]) {
    register int i = 0, choice = rand()%100+1, perc;
    for (perc = percents[0]; perc < choice; perc += percents[i+1], i++);
    return i;
}

int main() {
    int arrivals[] = {15,20,25,10,30};
    int service[] = {0,0,0,10,5,10,10,0,15,25,10,15};
    int clerks[] = {0,0,0,0}, numOfClerks = sizeof(clerks)/sizeof(int);
    int customers, t, i, numOfMinutes = 100, x;
    double maxWait = 0.0, currWait = 0.0, thereIsLine = 0.0;

cout << "sizo = " << sizeof(int) << endl;
    queue<int> simulQ;
    cout.precision(2);
    for (t = 1; t <= numOfMinutes; t++) {
   cout << " t = " << t;
   for (i = 0; i < numOfClerks; i++)  
       if (clerks[i] < 60)         
       clerks[i] = 0;      
       else clerks[i] -= 60;  
   customers = option(arrivals);
   for (i = 0; i < customers; i++) {
       x = option(service)*10;   
              
       simulQ.push(x);
       currWait += x;
   }
  
   for (i = 0; i < numOfClerks && !simulQ.empty(); )
      if (clerks[i] < 60) {
       x = simulQ.front();   
       simulQ.pop();   
       clerks[i] += x;        
       currWait -= x;        
      }
      else i++;

   if (!simulQ.empty()) {
       thereIsLine++;
       cout << " wait = " << currWait/60.0;
       if (maxWait < currWait)
       maxWait = currWait;
   }
   else cout << " wait = 0;";
    }
    cout << " For " << numOfClerks << " clerks, there was a line "
    << thereIsLine/numOfMinutes*100.0 << "% of the time; "
    << "maximum wait time was " << maxWait/60.0 << " min.";
    return 0;
}

Explanation / Answer

I have added the comments to the program as much as i can.

#include <iostream>
#include <cstdlib>
#include <queue> //

using namespace std;

int option(int percents[]) {
    register int i = 0, choice = rand()%100+1, perc;
    for (perc = percents[0]; perc < choice; perc += percents[i+1], i++);
    return i;
}

int main() {
    int arrivals[] = {15,20,25,10,30};                            //This is arrival of how many customers
    int service[] = {0,0,0,10,5,10,10,0,15,25,10,15};               // Service time given to customers
    int clerks[] = {0,0,0,0}, numOfClerks = sizeof(clerks)/sizeof(int); //Total clerks are 4 are mentioned
    int customers, t, i, numOfMinutes = 100, x;                           //Decalring variables
    double maxWait = 0.0, currWait = 0.0, thereIsLine = 0.0;           //Setting All time variables to 0 first

cout << "sizo = " << sizeof(int) << endl;                           //Displaying Sizo size of int which is 4  
    queue<int> simulQ;                                               //Decalring Queue simulQ
    cout.precision(2);                                               //Setting precision to 2 which means only 2 digitis will be displayed after point
    for (t = 1; t <= numOfMinutes; t++) {                           //Looping t from 1
   cout << " t = " << t;
   for (i = 0; i < numOfClerks; i++)
       if (clerks[i] < 60)                                                //if clerks 1 has less then 60 then assign him 0
       clerks[i] = 0;    
       else clerks[i] -= 60;                                           //if more than 60 then minus 60 from it
   customers = option(arrivals);
   for (i = 0; i < customers; i++) {                                   //looping in from customers
       x = option(service)*10;                                         //setting service time mulitpled by 10
            
       simulQ.push(x);                                                   //pushed x time for servive
       currWait += x;                                                   //increases wait time
   }

   for (i = 0; i < numOfClerks && !simulQ.empty(); )                   //loops now through clerks      
      if (clerks[i] < 60) {                                                  
       x = simulQ.front();
       simulQ.pop();                                                    
       clerks[i] += x;      
       currWait -= x;      
      }
      else i++;

   if (!simulQ.empty()) {                                               //if queue is not empty
       thereIsLine++;                                                       //line is incremented
       cout << " wait = " << currWait/60.0;                               //wait time is displayed
       if (maxWait < currWait)                                          
       maxWait = currWait;
   }
   else cout << " wait = 0;";                                       //else wait time is 0 customer ready to be serverd
    }
    cout << " For " << numOfClerks << " clerks, there was a line "    //Displaying total clerks
    << thereIsLine/numOfMinutes*100.0 << "% of the time; "                   //line and wait time average
    << "maximum wait time was " << maxWait/60.0 << " min.";
    return 0;
}

Thanks

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