c#在不使用反向函数和堆栈的情况下使用单循环反转字符串中的单词

Question

我尝试用单循环编写反转字符串中每个单词的逻辑，但我没有让它工作。您能否提供使用单循环而不使用反向函数来反转字符串中每个单词的逻辑。

输入：

欢迎来到这个世界

输出：

emocleW ot eht dlrow

我的逻辑有两个循环：

class Program
    {
        static void Main(string[] args)
        {
            string input = string.Empty;
            input = Console.ReadLine();
            string[] strarr=input.Split(' ');
            StringBuilder sb = new StringBuilder();
            foreach (string str in strarr)
            {
                sb.Append(fnReverse(str));
                sb.Append(' ');
            }
            Console.WriteLine(sb);
            Console.Read();
        }
        public static string fnReverse(string str)
        {
            string result = string.Empty;
            for (int i = str.Length-1; i >= 0; i--)
                result += str[i];
            return result;
        }
    }

Answer 1

    string strIn = "Welcome to the world";
    string strTmp = "";
    string strOut = "";

    for (int i=strIn.Length-1; i>-1; i--)
    {
        if (strIn[i] == ' ')
        {
            strOut = strTmp + " " + strOut;
            strTmp = "";
        }
        else
        {
            strTmp += strIn[i];
        }   
    }
    strOut = strTmp + " " + strOut;

给出结果“emocleW ot eht dlrow”

Answer 2

 string input = Console.ReadLine();
            string result = "";
            string tmp = "";
            for (int i = input.Length - 1; i >= 0; i--)
            {
                if (input[i] == ' ')
                {
                    result =  tmp + " " + result;
                    tmp = "";
                }
                else
                    tmp += input[i];
            }
            result = tmp + " " + result;
            Console.WriteLine(result);

这里是DEMO