Calculator.java

package BasicJavaPrograms.FunctionsMethods;
import java.util.Scanner;
public class Calculator {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int choice;
        do {
            System.out.println("\n--- Calculator Menu ---");
            System.out.println("1. Addition");
            System.out.println("2. Subtraction");
            System.out.println("3. Multiplication");
            System.out.println("4. Division");
            System.out.println("5. Exit");
            System.out.print("Enter your choice: ");
            choice = sc.nextInt();
            if (choice >= 1 && choice <= 4) {
                System.out.print("Enter the first number: ");
                int num1 = sc.nextInt();
                System.out.print("Enter the second number: ");
                int num2 = sc.nextInt();
                switch (choice) {
                    case 1:
                        System.out.println("Result: " + add(num1, num2));
                        break;
                    case 2:
                        System.out.println("Result: " + subtract(num1, num2));
                        break;
                    case 3:
                        System.out.println("Result: " + multiply(num1, num2));
                        break;
                    case 4:
                        try {
                            System.out.println("Result: " + divide(num1, num2));
                        } catch (IllegalArgumentException e) {
                            System.out.println("Error: " + e.getMessage());
                        }
                        break;
                }
            } else if (choice == 5) {
                System.out.println("Exiting Calculator. Goodbye!");
            } else {
                System.out.println("Invalid choice. Please try again.");
            }
        } while (choice != 5);
        sc.close();
    }
    public static int add(int a, int b) {
        return a + b;
    }
    public static int subtract(int a, int b) {
        return a - b;
    }
    public static int multiply(int a, int b) {
        return a * b;
    }
    public static double divide(int a, int b) {
        if (b == 0) {
            throw new IllegalArgumentException("Cannot divide by zero");
        }
        return (double) a / b;
    }   
}