System.out.println("덧셈 결과(정수): " + sum);
        System.out.println("뺄셈 결과(실수): " + difference);
        System.out.println("곱셈 결과(실수): " + product);
        System.out.println("나눗셈 결과(정수): " + quotient);
        scan.close();
    }
}