t2

import java.util.Scanner;

public class Calculator {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        
        System.out.print("Enter first number: ");
        double num1 = scanner.nextDouble();
        
        System.out.print("Enter operator (+, -, *, /): ");
        char operator = scanner.next().charAt(0);
        
        System.out.print("Enter second number: ");
        double num2 = scanner.nextDouble();
        
        double result = 0.0;
        
        switch(operator) {
            case '+':
                result = num1 + num2;
                break;
            case '-':
                result = num1 - num2;
                break;
            case '*':
                result = num1 * num2;
                break;
            case '/':
                result = (num2 != 0) ? num1 / num2 : Double.NaN;
                break;
            default:
                System.out.println("Error: Invalid operator!");
                scanner.close();
                return;
        }
        
        System.out.println("Result: " + result);
        
        scanner.close();
    }
}