internal class Program
{
    // 구조체 정의
    struct MyPoint
    {
        public int X;
        public int Y;

        public MyPoint(int x, int y)
        {
            this.X = x;
            this.Y = y;
        }

        public override string ToString()
        {
            return string.Format("({0}, {1})", X, Y);
        }
    }

    sealed class MyPointC
    {
        public int X;
        public int Y;

        public MyPointC(int x, int y)
        {
            this.X = x;
            this.Y = y;
        }

        public override string ToString()
        {
            return string.Format("({0}, {1})", X, Y);
        }
    }

    private static void Main(string[] args)
    {
        // 구조체 사용
        MyPoint pt = new MyPoint(10, 12);
        Console.WriteLine(pt.ToString());

    }
}