C++ で簡単な会計プログラムを作成するにはどうすればよいですか?

#include <iostream>
#include <vector>

using namespace std;

class Record {
public:
  int id;
  string date;
  string type;
  double amount;
  string description;
  Record(int _id, string _date, string _type, double _amount, string _description) {
    id = _id;
    date = _date;
    type = _type;
    amount = _amount;
    description = _description;
  }
};

class AccountBook {
public:
  vector<Record> records;

  void addRecord(int id, string date, string type, double amount, string description) {
    records.push_back(Record(id, date, type, amount, description));
  }

  void deleteRecord(int id) {
    for (vector<Record>::iterator it = records.begin(); it != records.end(); it++) {
      if (it->id == id) {
        records.erase(it);
        break;
      }
    }
  }

  void updateRecord(int id, double amount) {
    for (vector<Record>::iterator it = records.begin(); it != records.end(); it++) {
      if (it->id == id) {
        it->amount = amount;
        break;
      }
    }
  }

  void searchRecords(string type) {
    for (vector<Record>::iterator it = records.begin(); it != records.end(); it++) {
      if (it->type == type) {
        cout << "ID: " << it->id << endl;
        cout << "Date: " << it->date << endl;
        cout << "Type: " << it->type << endl;
        cout << "Amount: " << it->amount << endl;
        cout << "Description: " << it->description << endl;
      }
    }
  }

  void generateReport() {
    vector<double> income(5, 0);
    vector<double> expense(5, 0);
    for (vector<Record>::iterator it = records.begin(); it != records.end(); it++) {
      if (it->type == "Income") {
        income[0] += it->amount;
        if (it->description == "Salary") income[1] += it->amount;
        else if (it->description == "Bonus") income[2] += it->amount;
        else if (it->description == "Investment") income[3] += it->amount;
        else if (it->description == "Gift") income[4] += it->amount;
      }
      else if (it->type == "Expense") {
        expense[0] += it->amount;
        if (it->description == "Food") expense[1] += it->amount;
        else if (it->description == "Clothing") expense[2] += it->amount;
        else if (it->description == "Housing") expense[3] += it->amount;
        else if (it->description == "Transportation") expense[4] += it->amount;
      }
    }
    cout << "Total income: " << income[0] << endl;
    cout << "Salary: " << income[1] << endl;
    cout << "Bonus: " << income[2] << endl;
    cout << "Investment: " << income[3] << endl;
    cout << "Gift: " << income[4] << endl;
    cout << "Total expense: " << expense[0] << endl;
    cout << "Food: " << expense[1] << endl;
    cout << "Clothing: " << expense[2] << endl;
    cout << "Housing: " << expense[3] << endl;
    cout << "Transportation: " << expense[4] << endl;
  }

  double calculateBalance() {
    double income = 0, expense = 0;
    for (vector<Record>::iterator it = records.begin(); it != records.end(); it++) {
      if (it->type == "Income") {
        income += it->amount;
      }
      else if (it->type == "Expense") {
        expense += it->amount;
      }
    }
    return income - expense;
  }
};

void printMenu() {
  cout << "1. Add record" << endl;
  cout << "2. Delete record" << endl;
  cout << "3. Update record" << endl;
  cout << "4. Search records" << endl;
  cout << "5. Generate report" << endl;
  cout << "6. Calculate balance" << endl;
  cout << "7. Quit" << endl;
}

int main() {
  AccountBook accountBook;
  int choice;
  while (true) {
    printMenu();
    cout << "Enter your choice: ";
    cin >> choice;
    if (choice == 7) {
      cout << "Goodbye!" << endl;
      break;
    }
    switch (choice) {
      case 1: {
        int id;
        string date, type, description;
        double amount;
        cout << "Enter ID: ";
        cin >> id;
        cout << "Enter date (YYYY-MM-DD): ";
        cin >> date;
        cout << "Enter type (Income/Expense): ";
        cin >> type;
        cout << "Enter amount: ";
        cin >> amount;
        cout << "Enter description: ";
        cin >> description;
        accountBook.addRecord(id, date, type, amount, description);
        cout << "Record added." << endl;
        break;
      }
      case 2: {
        int id;
        cout << "Enter ID: ";
        cin >> id;
        accountBook.deleteRecord(id);
        cout << "Record deleted." << endl;
        break;
      }
      case 3: {
        int id;
        double amount;
        cout << "Enter ID: ";
        cin >> id;
        cout << "Enter amount: ";
        cin >> amount;
        accountBook.updateRecord(id, amount);
        cout << "Record updated." << endl;
        break;
      }
      case 4: {
        string type;
        cout << "Enter type (Income/Expense): ";
        cin >> type;
        accountBook.searchRecords(type);
        break;
      }
      case 5: {
        accountBook.generateReport();
        break;
      }
      case 6: {
        cout << "Balance: " << accountBook.calculateBalance() << endl;
        break;
      }
      default: {
        cout << "Invalid choice." << endl;
        break;
      }
    }
  }
  return 0;
}