Calculator

import java.util.Scanner;
class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("Welcome to Calculator!!");
        System.out.println("'+' Addition");
        System.out.println("'-' Subtraction");
        System.out.println("'*' Multiplication");
        System.out.println("'/' Division\n");
        while(true){
            System.out.println("Please choose the symbols first!! |+, -, *, /|\n");
            String symbols = scanner.nextLine();
            if(symbols.equalsIgnoreCase("exit")){
                System.out.println("Thank you for using the Calculator!!");
                break;
            }
            switch (symbols){
                case "+":
                    System.out.println("First Number: ");
                    double first_number = scanner.nextDouble();
                    scanner.nextLine();
                    System.out.println("Second Number: ");
                    double second_number = scanner.nextDouble();
                    scanner.nextLine();
                    double result;
                    result = first_number + second_number;
                    System.out.println(first_number + " + " + second_number + " = " + result);
                    break;
                case "-":
                    System.out.println("First Number: ");
                    double first_number_2 = scanner.nextDouble();
                    scanner.nextLine();
                    System.out.println("Second Number: ");
                    double second_number_2 = scanner.nextDouble();
                    scanner.nextLine();
                    double result_2;
                    result_2 = first_number_2 - second_number_2;
                    System.out.println(first_number_2 + " - " + second_number_2 + " = " + result_2);
                    break;
                case "*":
                    System.out.println("First Number: ");
                    double first_number_3 = scanner.nextDouble();
                    scanner.nextLine();
                    System.out.println("Second Number: ");
                    double second_number_3 = scanner.nextDouble();
                    scanner.nextLine();
                    double result_3;
                    result_3 = first_number_3 * second_number_3;
                    System.out.println(first_number_3 + " × " + second_number_3 + " = " + result_3);
                    break;
                case "/":
                    System.out.println("First Number: ");
                    double first_number_4 = scanner.nextDouble();
                    scanner.nextLine();
                    System.out.println("Second Number: ");
                    double second_number_4 = scanner.nextDouble();
                    scanner.nextLine();
                    double result_4;
                    result_4 = first_number_4 / second_number_4;
                    System.out.println(first_number_4 + " ÷ " + second_number_4 + " = " + result_4);
                    break;
                default:
                    System.out.println("SYSMBOL INVALID!!");
                    break;
            }
        }
        scanner.close();
    }
}