Lab 14 is CS1415 I have to tutor and it will be nice to have the code for people to look at

CS1415Lab14.cpp

//Clay Murray
//CS 1415
//A cool bank simulation with a queue
#include <iostream>
#include <queue>
#include <stdlib.h>
#include <time.h>
using namespace std;

int randomWait();

//Main runs the simulation 
int main(){
  int runtime; //Amount of time the business day lasts
  int currentTime = 0; //Current Time in minutes
  int nextArival;
  int serviceEndTime = 0;
  int longestWait = 0;
  int maxLineLength = 0;
  int waitTime;
  int customers = 0;
  bool dayOver = false;
  bool customerBeingServiced = false;
  bool firstCustomer = true;
  srand(time(0));

  queue<int> line;
  
  cout<<"This program simulates a queue at a bank\n\n";
  cout<<"How long to run simulation? (480 = 8 hours): ";
  cin>>runtime;

  //Time at which the first person arrives
  //and when they will finish being serviced
  nextArival = randomWait();

  //If the day isn't over or we still have someone being helped
  while(!dayOver || customerBeingServiced){
    //If the next arival is due put them in line
    //Unless the day is over. If the day is over dont allow new people in line
    if(currentTime >= nextArival && !dayOver){
      line.push(currentTime);
      customers++;
      nextArival = randomWait() + currentTime;
      //Output a differnt message for the first customer arriving
      if(!firstCustomer){
        cout<<currentTime<<": A customer has arrived\n";
      }else{
        cout<<currentTime<<": The first customer has arrived\n";
        firstCustomer = false;
      }
      
    }

    //If the service time for a customer is up and there is currently a customer at the window
    //Shoo them away and say they are finished
    //We do this first or else there will be a minute wait sometimes between when a customer is done 
    //and when we get a new one
    //Causing the simulation to run a lot longer
    if(currentTime >= serviceEndTime && customerBeingServiced){
        customerBeingServiced = false;
        cout<<currentTime<<": A customer finshed being serviced\n";
    }

    //If there is no customer and the window and the line isn't empty
    //Get the next customer in line and see how long he/she has been waiting
    if(!customerBeingServiced && !line.empty()){
      customerBeingServiced = true;
      waitTime = currentTime - line.front();
      serviceEndTime = currentTime + randomWait();
      line.pop();
      if(waitTime > longestWait){
        longestWait = waitTime;
      }
    }

    //Check to see the longest legnth of the line
    if(line.size() > maxLineLength){
      maxLineLength = line.size();
    }

    //if we are at closing time set day over to true so we can service the remaining people in line 
    //but not allow anymore in
    if(currentTime >= runtime){
      dayOver = true;
    }
    currentTime++;
  }
  
  cout<<"longest wait: "<<longestWait<<"\n";
  cout<<"Max line length: "<<maxLineLength<<"\n";
  cout<<"Total customers: "<<customers<<"\n";
}

//It's just helpful to not have to write out random % 4 everytime
int randomWait(){
  
  return (random() % 4) + 1;
}