=== question1.dart ===

import 'dart:io';

void main() {
  bool lightsOn = false;
  int temperature = 20;
  bool securityArmed = false;

  const int minTemp = 15;
  const int maxTemp = 30;

  while (true) {
    print('\n--- Smart Home Menu ---');
    print('1. Toggle Lights');
    print('2. Set Temperature');
    print('3. Toggle Security System');
    print('4. View Status');
    print('5. Exit');
    stdout.write('Enter your choice: ');
    String? choice = stdin.readLineSync();

    switch (choice) {
      case '1':
        lightsOn = !lightsOn;
        print('Lights are now ${lightsOn ? "ON" : "OFF"}');
        break;
      case '2':
        stdout.write('Enter temperature ($minTemp-$maxTemp): ');
        int? newTemp = int.tryParse(stdin.readLineSync() ?? '');
        if (newTemp != null && newTemp >= minTemp && newTemp <= maxTemp) {
          temperature = newTemp;
          print('Temperature set to $temperature°C');
        } else {
          print('Invalid temperature. Must be between $minTemp and $maxTemp.');
        }
        break;
      case '3':
        securityArmed = !securityArmed;
        print('Security system is now ${securityArmed ? "ARMED" : "DISARMED"}');
        break;
      case '4':
        print('\n--- System Status ---');
        print('Lights: ${lightsOn ? "ON" : "OFF"}');
        print('Temperature: $temperature°C');
        print('Security: ${securityArmed ? "ARMED" : "DISARMED"}');
        if (temperature % 3 == 0 && temperature % 5 == 0) {
          print('Perfect Day');
        } else if (temperature % 3 == 0) {
          print('Cool Day');
        } else if (temperature % 5 == 0) {
          print('Warm Day');
        }
        break;
      case '5':
        print('Exiting Smart Home System...');
        return;
      default:
        print('Invalid choice. Try again.');
    }
  }
}


=== question2.dart ===

import 'dart:io';

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

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

  while (true) {
    print('\n--- Menu ---');
    print('1. Add Income');
    print('2. Add Expense');
    print('3. View Summary');
    print('4. Exit');
    stdout.write('Enter your choice: ');
    String? choice = stdin.readLineSync();

    if (choice == '1') {
      stdout.write('Enter income description: ');
      String? desc = stdin.readLineSync();
      stdout.write('Enter income amount: ');
      double? amount = double.tryParse(stdin.readLineSync() ?? '');
      if (amount != null && amount > 0) {
        incomeList.add({desc ?? 'Unknown': amount});
        print('Income added.');
      } else {
        print('Invalid amount.');
      }
    } else if (choice == '2') {
      stdout.write('Enter expense description: ');
      String? desc = stdin.readLineSync();
      stdout.write('Enter expense amount: ');
      double? amount = double.tryParse(stdin.readLineSync() ?? '');
      if (amount != null && amount > 0) {
        expenseList.add({desc ?? 'Unknown': amount});
        print('Expense added.');
      } else {
        print('Invalid amount.');
      }
    } else if (choice == '3') {
      double totalIncome = incomeList.fold(0, (sum, item) => sum + item.values.first);
      double totalExpense = expenseList.fold(0, (sum, item) => sum + item.values.first);
      double netProfit = totalIncome - totalExpense;
      double tax = netProfit > 0 ? netProfit * 0.15 : 0;

      print('\n--- Summary ---');
      print('Total Income: \$${totalIncome.toStringAsFixed(2)}');
      print('Total Expenses: \$${totalExpense.toStringAsFixed(2)}');
      if (netProfit > 0) {
        print('Your net profit is \$${netProfit.toStringAsFixed(2)}');
        print('Tax (15%): \$${tax.toStringAsFixed(2)}');
      } else if (netProfit < 0) {
        print('Your net loss is \$${(-netProfit).toStringAsFixed(2)}');
      } else {
        print('You broke even.');
      }
    } else if (choice == '4') {
      print('Exiting Budget Management Application...');
      break;
    } else {
      print('Invalid choice. Try again.');
    }
  }
}