Dart Assignment Smart Home System (Dart Code)

import ‘dart:io’;

void main() { const int minTemp = 15; const int maxTemp = 30;

bool lightsOn = false; int thermostat = 20; bool securityArmed = false;

while (true) { print(“Home System”); print(“1. Toggle Lights”);
print(“2. Set Thermostat”); print(“3. Arm/Disarm Security System”);
print(“4. View System Status”); print(“5. Exit”);

    stdout.write("Enter your choice: ");
    int choice = int.parse(stdin.readLineSync()!);

    if (choice == 1) {
      lightsOn = !lightsOn;
      print(lightsOn ? "Lights turned ON" : "Lights turned OFF");

    } else if (choice == 2) {
      stdout.write("Enter temperature ($minTemp - $maxTemp): ");
      int temp = int.parse(stdin.readLineSync()!);

      if (temp >= minTemp && temp <= maxTemp) {
        thermostat = temp;
        print("Temperature set to $thermostat°C");
      } else {
        print("Invalid temperature.");
      }

    } else if (choice == 3) {
      securityArmed = !securityArmed;
      print(securityArmed ? "Security System ARMED" : "Security System DISARMED");

    } else if (choice == 4) {
      String lightStatus = lightsOn ? "ON" : "OFF";
      String securityStatus = securityArmed ? "ARMED" : "DISARMED";

      print("\nSystem Status:");
      print("Lights: $lightStatus");
      print("Thermostat: $thermostat°C");
      print("Security System: $securityStatus");
    } else if (choice == 5) {
      print("Exiting system...");
      break;
    } else {
      print("Invalid choice");
    }

} }

Budget Management Application (Dart Code)

import ‘dart:io’;

void main() {

List<Map<String, dynamic>> incomeList = []; List<Map<String, dynamic>>
expenseList = [];

while (true) {

    print("\nBudget Management System");
    print("1. Add Income");
    print("2. Add Expense");
    print("3. View Summary");
    print("4. Exit");

    stdout.write("Enter your choice: ");
    int choice = int.parse(stdin.readLineSync()!);

    if (choice == 1) {

      stdout.write("Enter income description: ");
      String desc = stdin.readLineSync()!;

      stdout.write("Enter income amount: ");
      double amount = double.parse(stdin.readLineSync()!);

      if (amount > 0) {
        incomeList.add({"description": desc, "amount": amount});
        print("Income added successfully.");
      }

    } else if (choice == 2) {

      stdout.write("Enter expense description: ");
      String desc = stdin.readLineSync()!;

      stdout.write("Enter expense amount: ");
      double amount = double.parse(stdin.readLineSync()!);

      if (amount > 0) {
        expenseList.add({"description": desc, "amount": amount});
        print("Expense added successfully.");
      }

    } else if (choice == 3) {

      double totalIncome = 0;
      double totalExpense = 0;

      for (var item in incomeList) {
        totalIncome += item["amount"];
      }

      for (var item in expenseList) {
        totalExpense += item["amount"];
      }

      double net = totalIncome - totalExpense;

      print("\nSummary:");
      print("Total Income: $totalIncome");
      print("Total Expenses: $totalExpense");

      if (net >= 0) {
        print("Your net profit is $net");
        double tax = net * 0.15;
        print("Tax to be paid (15%): $tax");
      } else {
        print("Your net loss is ${net.abs()}");
      }

    } else if (choice == 4) {
      print("Exiting program...");
      break;
    }

} }