SmartExpenseTracker.java

import java.util.Scanner;
class SmartExpenseTracker {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int select;
        int totalExpense = 0;
        int foodExpense = 0;
        int travelExpense = 0;
        int otherExpense = 0;
        System.out.print("Enter your daily expense limit: ");
        int limit = sc.nextInt();
        while (true) {
            System.out.println("\n--- Smart Expense Tracker ---");
            System.out.println("1. Add Expense");
            System.out.println("2. Show Summary");
            System.out.println("3. Exit");
            System.out.print("Enter your selected number: ");
            select = sc.nextInt();
            switch (select) {
              case 1:
                sc.nextLine(); 
                System.out.print("Enter category (food/travel/other): ");
                String category = sc.nextLine().toLowerCase();
                System.out.print("Enter expense amount: ");
                int amt = sc.nextInt();
                if (amt <= 0) {
                  System.out.println("Invalid amount. Please enter a positive value.");
                  break;
                }
                totalExpense += amt;
                if (category.equals("food")) {
                   foodExpense += amt;
                } else if (category.equals("travel")) {
                   travelExpense += amt;
                } else if (category.equals("other")) {
                   otherExpense += amt;
                } else {
                   System.out.println("Invalid category! Expense added to 'Other'.");
                   otherExpense += amt;
                }
                System.out.println("Expense added successfully!");
                if (totalExpense > limit) {
                   System.out.println(" WARNING: You crossed your daily limit!");
                }
                break;
            case 2:
                System.out.println("\n--- Expense Summary ---");
                System.out.println("Food Expense   : " + foodExpense);
                System.out.println("Travel Expense : " + travelExpense);
                System.out.println("Other Expense  : " + otherExpense);
                System.out.println("-------------------------");
                System.out.println("Total Expense  : " + totalExpense);
                System.out.println("Daily Limit    : " + limit);
                break;
            case 3:
                System.out.println("\nFinal Summary:");
                System.out.println("Total Spent: " + totalExpense);
                System.out.println("Thank you for using Smart Expense Tracker!");
                return;
            default:
                System.out.println("Invalid choice. Try again.");
            }
        }
    }
}