use java design a working calculator as shown in 4th slide

Sure! I can help you design a basic calculator using Java. Here's an example code:

import java.util.Scanner;

public class Calculator {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.println("Enter the first number: ");
        double num1 = scanner.nextDouble();

        System.out.println("Enter the second number: ");
        double num2 = scanner.nextDouble();

        System.out.println("Select an operation (+, -, *, /): ");
        char operator = scanner.next().charAt(0);

        double result = 0.0;

        switch (operator) {
            case '+':
                result = num1 + num2;
                break;
            case '-':
                result = num1 - num2;
                break;
            case '*':
                result = num1 * num2;
                break;
            case '/':
                result = num1 / num2;
                break;
            default:
                System.out.println("Invalid operator!");
                return;
        }

        System.out.println("The result is: " + result);

        scanner.close();
    }
}

This code prompts the user to enter two numbers and an operator (+, -, *, /). It then performs the corresponding calculation and displays the result. Let me know if you have any questions or need further assistance!