else if (score >= 80)
        {
            grade = 'B';
        }
        else if (score >= 70)
        {
            grade = 'C';
        }
        else if (score >= 60)
        {
            grade = 'D';
        }
        else
        {
            grade = 'F';
        }

        Console.WriteLine($"점수 : {score}점");
        Console.WriteLine($"학점 : {grade}학점");
    }
}