ASSIGNMENT 1

PART 2: BUDGET MANAGEMENT APPLICATION (DART CLI)

import ‘dart:io’;

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

bool isRunning = true;

print(“=== Budget Management Application ===”);

while (isRunning) { print(“an option:”); print(“1. Add Income”);
print(“2. Add Expense”); print(“3. View Summary”); print(“4. Exit”);

    String? choice = stdin.readLineSync();

    if (choice == "1") {
      print("Enter income description:");
      String description = stdin.readLineSync()!;

      print("Enter income amount:");
      double? amount = double.tryParse(stdin.readLineSync()!);

      if (amount != null && amount > 0) {
        incomeList.add({description: amount});
        print("Income added successfully!");
      } else {
        print("Invalid amount. Please enter a positive number.");
      }
    }

    else if (choice == "2") {
      print("Enter expense description:");
      String description = stdin.readLineSync()!;

      print("Enter expense amount:");
      double? amount = double.tryParse(stdin.readLineSync()!);

      if (amount != null && amount > 0) {
        expenseList.add({description: amount});
        print("Expense added successfully!");
      } else {
        print("Invalid amount. Please enter a positive number.");
      }
    }

    else if (choice == "3") {
      double totalIncome = 0;
      double totalExpense = 0;

      for (var income in incomeList) {
        totalIncome += income.values.first;
      }

      for (var expense in expenseList) {
        totalExpense += expense.values.first;
      }

      double net = totalIncome - totalExpense;

      print("\n=== Monthly Summary ===");
      print("Total Income: \$${totalIncome.toStringAsFixed(2)}");
      print("Total Expenses: \$${totalExpense.toStringAsFixed(2)}");

      if (net > 0) {
        print("Your net profit is \$${net.toStringAsFixed(2)}");
        double tax = net > 0 ? net * 0.15 : 0;
        print("Tax to be paid (15%): \$${tax.toStringAsFixed(2)}");
      } else if (net < 0) {
        print("Your net loss is \$${net.abs().toStringAsFixed(2)}");
      } else {
        print("You broke even this month.");
      }
    }

    else if (choice == "4") {
      print("Exiting Budget Application...");
      isRunning = false;
    }

    else {
      print("Invalid option. Try again.");
    }

} }