using System;

public class Test
{
    public static void Main()
    {
        string s = "     1.2             3.4    5.6     8.9    ";
        int startIdx, endIdx = 0;
        while(true)
        {
            startIdx = endIdx;
            // no find_first_not_of in C#
            while (startIdx < s.Length && s[startIdx] == ' ') startIdx++;
            if (startIdx == s.Length) break;
            endIdx = s.IndexOf(' ', startIdx);
            if (endIdx == -1) endIdx = s.Length;
            // how to extract a double here?
            Console.WriteLine("|" + s.Substring(startIdx, endIdx - startIdx) + "|");
        }
    }
}