写一个Reserve函数处理字符串，比如输入”I am a boy”,输出”boy a am I”

C# codes as below:

 

 

 

        public static string MyReserve(string str)

        {

            if (str == string.Empty)

            {

                return str;

            }

            char[] myChar = str.ToCharArray();

 

            char[] myChar2 = new char[myChar.Length];

 

            bool mark;

            int count = 0;

            if (myChar[0] == ' ')

            {

                mark = true;

            }

            else

            {

                mark = false;

            }

 

            for (int i = 0; i < myChar.Length; i++)

            {

                if (myChar[i] == ' ')

                {

                    if (mark == true)

                    {

                        count++;

                    }

                    else

                    {

                        for (int j = 0; j < count; j++)

                        {

                            myChar2[myChar.Length -i +j ] = myChar[i - j - 1];

                        }

                        count = 0;

                        mark = true;

                        i--;

                       

                    }

                }

                else

                {

                    if (mark == false)

                    {

                        count++;

                    }

                    else

                    {

                        for (int j = 0; j < count; j++)

                        {

                            myChar2[myChar.Length - i + j] = myChar[i - j - 1];

                        }

                        count = 0;

                        mark = false;

                        i--;

 

                    }

                }

            }

 

            for (int j = 0; j < count; j++)

            {

                myChar2[j] = myChar[myChar.Length-1-j];

            }

 

            return new string(myChar2);

        }