says number in string is negative),parse string to float and make it negative{ } //if its not,parse it
{ }//if negative bool of string2 is true,set float to
float.Parse,Single.Parse或Convert.ToSingle();给出所有相同的结果.String[] splittedLine = new String[25];
float X = float.Parse(splittedLine[3]);
float Y = Single.P