reverseSentence.cs

// input: Welcome to Csharp corner
// output: corner Csharp to Welcome

internal static void ReverseWordOrder(string str)  
{  
    int i;  
    StringBuilder reverseSentence = new StringBuilder();  
  
    int Start = str.Length - 1;  
    int End = str.Length - 1;  
  
    while (Start > 0)  
    {  
        if (str[Start] == ' ')  
        {  
            i = Start + 1;  
            while (i <= End)  
            {  
                reverseSentence.Append(str[i]);  
                i++;  
            }  
            reverseSentence.Append(' ');  
            End = Start - 1;  
        }  
        Start--;  
    }  
  
    for (i = 0; i <= End; i++)  
    {  
        reverseSentence.Append(str[i]);  
    }  
    Console.WriteLine(reverseSentence.ToString());  
}