小练习 登月机器人

　　今天看到园子里有一个登月机器人的面试题,于试着写一下,有一点坑爹的地方是if不能起过5个,下面就有这种情况

if(a){
    if(x) code1;
    if(y) code2;
}

这个我改成

if(a && x) code1;
if(a && y) code2;

我这样不是也少了if吗?这坑爹.

下面是一坨C#代码

    public class MoonRabbit
    {
        private string DIR = "NESW";

        private Tuple<int, int> position;//当前位置
        private int direction;//当前的方向

        public MoonRabbit(Tuple<int, int> position, char direction)
        {
            this.position = position;
            this.direction = DIR.IndexOf(direction);
        }

        public void Foo(string instruct)
        {
            char[] ch = instruct.ToArray<char>();

            for (int i = 0, ct = ch.Length; i < ct; i++)
            {
                Rotation(ch[i]);
                Move(ch[i]);
            }
        }

        public void Show()
        {
            Console.WriteLine("当前位置({0},{1}),方向{2}", position.Item1, position.Item2, DIR[direction]);
        }

        private void Rotation(char instruct)
        {
            if (instruct == 'R') direction = (direction + 1) % 4;
            if (instruct == 'L') direction = (direction - 1 + 4) % 4;
        }
        private void Move(char instruct)
        {
            int x = position.Item1;
            int y = position.Item2;

            if (instruct == 'F' && (DIR.IndexOf('E') == direction || DIR.IndexOf('W') == direction))
                x = x + (2 - direction); //13 EW
            if (instruct == 'F' && (DIR.IndexOf('N') == direction || DIR.IndexOf('S') == direction))
                y = y + (1 - direction);//02 NS

            position = new Tuple<int, int>(x, y);
        }
    }