罗马数字与阿拉伯数字的相互转换

最新推荐文章于 2024-07-30 21:00:22 发布

小白阿旭

最新推荐文章于 2024-07-30 21:00:22 发布

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文章标签： c# .net

原文链接：https://blog.youkuaiyun.com/qinyuanpei/article/details/80162028

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本文介绍了一个C#程序，实现罗马数字到阿拉伯数字和反之的转换，通过字典存储了罗马数字对应的数值。用户可以选择转换方向并输入相应数字进行转换。

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public void homework2()
        {
            Dictionary<int, string> number = new Dictionary<int, string>
            {
                {1,"I" },
                {4,"IV"},
                {5,"V" },
                {9,"IX"},
                {10,"X" },
                {40,"XL"},
                {50,"L" },
                {90,"XC"},
                {100,"C" },
                {400,"CD"},
                {500,"D" },
                {900,"CM"},
                {1000,"M" }
            };
            var num = number.OrderByDescending(e => e.Key).ToList();

            Console.WriteLine("开始罗马转数字请按“a“ ");
            Console.WriteLine("开始数字转罗马请按“b” ");
            string b = Console.ReadLine();
            while(b == "a")
            {
                while (b != "q")
                {
                    Console.WriteLine("请输入要转换成罗马数字的阿拉伯数字");
                    string a = Console.ReadLine();
                    int inta = int.Parse(a);
                    var output = new StringBuilder();
                    for (int i = 0; i < num.Count && inta > 0; i++)
                    {
                        if (inta < num[i].Key) continue;
                        while (inta >= num[i].Key)
                        {
                            inta -= num[i].Key;
                            output.Append(num[i].Value);
                        }
                    }
                    Console.WriteLine(output.ToString());

                    Console.WriteLine("继续请按任意键，退出则按“q”");
                    b = Console.ReadLine();
                }
            }
            while(b == "b")
            {
                while(b != "q")
                {
                    Console.WriteLine("请输入要转换成阿拉伯数字的罗马数字");
                    string stra = Console.ReadLine();
                    var intnumber = 0;
                    var length = stra.Length;
                    var digits = new Dictionary<string, int>()
                    {
                        {"I",1},
                        {"V",5},
                        {"X",10},
                        {"L",50},
                        {"C",100},
                        {"D",500},
                        {"M",1000}
                    };
                    for (int i = 0; i < length - 1; i++)
                    {
                        //前面 n-1 位数字通过左右比较决定正负 & 第 n 位数字必然为正
                        if ((digits[stra[i].ToString()] >= digits[stra[i + 1].ToString()]) || i + 1 >= length)
                        {
                            intnumber += digits[stra[i].ToString()];
                        }
                        else
                        {
                            intnumber -= digits[stra[i].ToString()];
                        }
                    }
                    intnumber += digits[stra[length-1].ToString()];

                    Console.WriteLine(intnumber);
                    Console.WriteLine("继续请按任意键，退出则按“q”");
                    b = Console.ReadLine();
                }
            }
            
        }