Can you please clean up my code? I think there is an implementation problem. Thank you.  #include #include #include   using namespace std;   void enqQ(int&); void deqQ(int&); void clearQ(int&, int&); bool isEmpty(int, int); bool isFull(int, int);     struct planes // data type plane declared via struct { stringrequest; stringflightNum; stringstartingPoint; stringdestination; stringnumberOfPassengers; };   void enqQ(int& rear) // adds data to queue { rear = (rear + 1) % 10; }   void deqQ(int& front) // delets data from queue { front = (front + 1) % 10; }   void clearQ(int& front, int& rear) // clears queue { front = -1; rear = -1; }   bool isEmpty(int front, int rear) // tells if queue is empty or not { if (rear == front) return true; else return false; }   bool isFull(int front, int rear) // tells if queue is full or not { if ((rear + 1) % 10 == front) return true; else return false; }   int main() { planes normalQueue[15]; planes emergencyQueue[10]; planes plane; fstream fin; int normalFront; int normalRear; int emergencyFront; int emergencyRear; int time; string planeInfo;   clearQ(normalFront, normalRear); clearQ(emergencyFront, emergencyRear);     fin.open("Airport Queue Data.txt"); // makes sure that named text is there if (!fin) { cerr << "\ncould not open file"; exit(-1); }   time = 1; // time is declared to 1   while (!fin.eof()) // reads data until end of file { cout << "Time Cycle = " << time << ":00" << endl; // prints time cycle   getline(fin, planeInfo); // gets entire line and puts it in planeInfo which is temp variable   plane.request = planeInfo.substr(0, 8); // these function reads specific characters from planeInfo and stores them into proper areas of the struct plane.flightNum = planeInfo.substr(8, 3); plane.startingPoint = planeInfo.substr(11, 8); plane.destination = planeInfo.substr(19, 8); plane.numberOfPassengers = planeInfo.substr(27, 3);       if (plane.request == "NORMAL  ") // if plane request is normal then it will be place into normal queue { cout << "Plane added to Normal Queue" << endl; enqQ(normalRear); // normalRear increases normalQueue[normalRear] = plane; // adds plane to normalqueue and prints out plane info cout << plane.flightNum << "\t";  cout << plane.startingPoint << "\t"; cout << plane.destination << "\t"; cout << plane.numberOfPassengers << "\n"; cout << "---------------############---------------------\n" << endl; } else { cout << "Plane added to Emergency Queue" << endl; enqQ(emergencyRear); // emergency rear increases  emergencyQueue[emergencyRear] = plane; // adds plane to emergency Queue and prints out plane info cout << plane.flightNum << "\t"; cout << plane.startingPoint << "\t"; cout << plane.destination << "\t"; cout << plane.numberOfPassengers << "\n"; cout << "---------------############---------------------\n" << endl; }   if (time % 2 == 0) // plane will land only if time is even { if (!isEmpty(emergencyFront, emergencyRear)) // checks if emergency queue is empty if not than it will be prioritize to land { cout << "Emergency Plane Landed" << endl; deqQ(emergencyFront); // increments emergency front and print plane info cout << emergencyQueue[emergencyFront].flightNum << "\t"; cout << emergencyQueue[emergencyFront].startingPoint << "\t"; cout << emergencyQueue[emergencyFront].destination << "\t"; cout << emergencyQueue[emergencyFront].numberOfPassengers << endl; cout << "---------------############---------------------\n" << endl;     } else { cout << "Normal Plane Landed" << endl; deqQ(normalFront); // increments normal front and prints plane info cout << normalQueue[normalFront].flightNum << "\t"; cout << normalQueue[normalFront].startingPoint << "\t"; cout << normalQueue[normalFront].destination << "\t"; cout << normalQueue[normalFront].numberOfPassengers << endl; cout << "---------------############---------------------\n" << endl;   } } time++; // increments time if (time > 24) // check time cycle resets to 1 when it reaches 24 { time = 1; } } fin.close(); // closes fin file     cout << "\n\n\n Flights still in Queues" << endl; // prints planes still left in queues   cout << "\nNormal Queue: " << endl; while (!isEmpty(normalFront, normalRear)) // prints planes that are left in normal queue { deqQ(normalFront); cout << normalQueue[normalFront].request << "\t"; cout << normalQueue[normalFront].flightNum << "\t"; cout << normalQueue[normalFront].startingPoint << "\t"; cout << normalQueue[normalFront].destination << "\t"; cout << normalQueue[normalFront].numberOfPassengers << endl; }   cout << "\nEmergency Queue: " << endl; while (!isEmpty(emergencyFront, emergencyRear)) // prints planes that are left in emergency queue { deqQ(emergencyFront);  cout << emergencyQueue[emergencyFront].request << "\t"; cout << emergencyQueue[emergencyFront].flightNum << "\t"; cout << emergencyQueue[emergencyFront].startingPoint << "\t"; cout << emergencyQueue[emergencyFront].destination << "\t"; cout << emergencyQueue[emergencyFront].numberOfPassengers << endl; }   return 0; }