Update Function

//OPTION 2 : Update Reservation Records
void updateRecord(){
  string name;
  int bNo, phoneNo, paxNo, day, month, year, time, date;
  int correct = 1;
  cout << "----------------=UPDATE RECORD=-----------------" << endl;
  cout<<"Enter 0 to return to main menu."<<endl;
  cout << "Enter Booking Number : ";
  cin >> bNo;
  if(bNo == 0){
    cout << "Press enter to continue . . .";
    getchar();
    system("CLS");
    main();
  }

  if(RBList.checker(bNo)){
    RBList.PrintBookingNoRecords(bNo);
    RBList.deleteNode(bNo);
    cin.clear();
    cin.ignore(1000, '\n');

    do{
      cout<<"Enter name : ";
      getline(cin, name);
    }while(!checkName(name));

    if(name=="0"){
      cout << "Press enter to continue . . .";
      getchar();
      system("CLS");
      main();
    }

    cout<<endl<<"Enter phone number (e.g : 0123456789) : ";
    cin>>phoneNo;

    correct = 1;
    while (correct == 1){
      if (cin.fail() || phoneNo<0 || checkNoOfDigits(phoneNo)>10){
        cin.clear();
        cin.ignore();
        cout << "Invalid input! Enter positive numbers (maximum 11 digits)!" << endl<<endl;
        cout<< "Enter phone number (e.g : 0123456789) : ";
        cin >> phoneNo;
      }else{
        correct = 0;
      }
    }

    correct = 1;
    cout<<endl<<"Enter number of pax (maximum : 50) : ";
    cin>>paxNo;

    while (correct == 1){
      if (cin.fail() || paxNo<=0 || paxNo > 50){
        cin.clear();
        cin.ignore();
        cout << "Invalid input! Enter positive numbers (max : 50 , min : 1)!" << endl<<endl;
        cout<< "Enter number of pax (maximum : 50) : ";
        cin >> paxNo;
      }else{
        correct = 0;
      }
    }

    do{
      correct = 1;
      cout<<endl<<"Enter year (e.g : 2019): ";
      cin>>year;
      while (correct == 1){
        if (cin.fail() || year > 2021){
          cin.clear();
          cin.ignore();
          cout << "Invalid input! Enter numbers (maximum year is 2021)!" << endl<<endl;
          cout<< "Enter year (e.g : 2019) : ";
          cin >> year;
          //reset if a year before 2019 was entered then 2022 or later is entered
        }else{
          correct = 0;
        }
      }
    }while(!checkYear(year));

    do{
      correct = 1;
      cout<<endl<<"Enter month (e.g : January = 1) : ";
      cin>>month;
      while (correct == 1){
        if (cin.fail()){
          cin.clear();
          cin.ignore();
          cout << "Invalid input! Enter numbers!" << endl<<endl;
          cout<< "Enter month (e.g : January = 1) : ";
          cin >> month;
        }else{
          correct = 0;
        }
      }
    }while(!checkMonth(month, year));

    do{
      correct = 1;
      cout<<endl<<"Enter day : ";
      cin>>day;
      while (correct == 1){
        if (cin.fail()){
          cin.clear();
          cin.ignore();
          cout << "Invalid input! Enter numbers!" << endl<<endl;
          cout<< "Enter day : ";
          cin >> day;
        }else{
          correct = 0;
        }
      }
    }while(!checkDay(day, month, year));

    do{
      correct = 1;
      cout<<endl<<"Enter time in 24hr format (e.g : 3.30pm = 1530) : ";
      cin>>time;
      while (correct == 1){
        if (cin.fail()){
          cin.clear();
          cin.ignore();
          cout << "Invalid input! Enter positive numbers (maximum 4 digits)!" << endl<<endl;
          cout<< "Enter time in 24hr format (e.g : 3.30pm = 1530) : ";
          cin >> time;
        }else{
          correct = 0;
        }
      }
    }while(!checkTime(time, day, month, year));

    //for finding the reservation by date
    date = year*10000 + month*100 + day;

    RBList.InsNewNodeByBookNo(bNo, name, phoneNo, paxNo, day, month, year, time, date);
    cout<<"Update process complete."<<endl;
  }else{
    cout<<"No existing record with that booking number."<<endl
    <<"Update process cancelled."<<endl;
  }

  cin.clear();
  cin.ignore(1000, '\n');
  cout << "Press enter to continue . . .";
  getchar();
  system("CLS");
  main();
}