TaghreedAdel_243000607_question2.txt

/**
 * Student Name: تغريد عادل
 * University ID: 243000607
 * Question: 2 - Budget Management Application
 */

import 'dart:io';

void main() {
  List<Map<String, double>> incomeList = [];
  List<Map<String, double>> expenseList = [];

  print('Welcome to the Budget Management Application, Taghreed!');

  while (true) {
    print('\nPlease choose an option:');
    print('1. Add income');
    print('2. Add expense');
    print('3. View summary');
    print('4. Exit');

    stdout.write('Enter your choice: ');
    String? choice = stdin.readLineSync();

    switch (choice) {
      case '1':
        stdout.write('Enter income description: ');
        String desc = stdin.readLineSync() ?? 'Income';
        stdout.write('Enter income amount: ');
        double? amount = double.tryParse(stdin.readLineSync() ?? '');

        if (amount != null && amount > 0) {
          incomeList.add({desc: amount});
          print('Income added successfully!');
        } else {
          print('Invalid amount! No negative numbers allowed.');
        }
        break;

      case '2':
        stdout.write('Enter expense description: ');
        String desc = stdin.readLineSync() ?? 'Expense';
        stdout.write('Enter expense amount: ');
        double? amount = double.tryParse(stdin.readLineSync() ?? '');

        if (amount != null && amount > 0) {
          expenseList.add({desc: amount});
          print('Expense added successfully!');
        } else {
          print('Invalid amount! No negative numbers allowed.');
        }
        break;

      case '3':
        double totalIncome = 0;
        double totalExpenses = 0;

        for (var item in incomeList) totalIncome += item.values.first;
        for (var item in expenseList) totalExpenses += item.values.first;

        double netProfit = totalIncome - totalExpenses;

        print('\n--- Financial Summary for Taghreed ---');
        print('Total Income: \$${totalIncome.toStringAsFixed(2)}');
        print('Total Expenses: \$${totalExpenses.toStringAsFixed(2)}');

        if (netProfit >= 0) {
          print('Your net profit is \$${netProfit.toStringAsFixed(2)}');
        } else {
          print('Your net loss is \$${netProfit.abs().toStringAsFixed(2)}');
        }

        // حساب الضريبة باستخدام Ternary Operator
        double tax = (netProfit > 0) ? (netProfit * 0.15) : 0;
        if (netProfit > 0) {
          print('Tax to be paid (15%): \$${tax.toStringAsFixed(2)}');
        }
        break;

      case '4':
        print('Exiting. Have a great day, Taghreed!');
        return;

      default:
        print('Invalid option, please try again.');
    }
  }
}