null values in a string array

Question

I have a code that reads in a text file of numbers that are both tab delimited as well as a carriage return at the end of each line. I have read the file into a string array but the array does not get rid of the null values. How do I do this? Here is what I have thus far. Thanks for any help! using System; using System.IO; using System.Collections; namespace try_again { class Class1 { static void Main(string[] args) { StreamWriter swa = new StreamWriter (c:\afinal.txt); StreamReader sra = new StreamReader (c:\ChristineWork	est1.txt); string aLine = sra.ReadToEnd(); string[] TokenBuffer = aLine.Split(new Char [] {' '}); foreach(string token in TokenBuffer) { if(token.Length !=0) Console.WriteLine(token); } Console.ReadLine(); sra.Close();

calfson · Answer

Thank you so much for all your help. It really has been a war. :) I apologize for the double post as well. Thanks!

bilnaad · Answer

No... It's obvious you can't read doubles directly from a file. Not even strings :) The only type that can be read from a file directly is a byte (or bytes). I've tried to look for some information on how to convert bytes back to a double. Not the Convert.ToDouble() because it can only take a single byte to convert. So you just get the byte's value as a double. And that's not what you wrote into the file. So I searched for information but found nothing usefull. So I sticked with reading strings from the file. And convert it into a double. Because the convertion ignores the dot like in 11.27 the result to a double was 1127. So I divided that number with 100.00 and the correct value showed. Now I wrapped the whole process into one single function. So it's easy to adopt. I hope this helps you with your war against reading the file :) using System; using System.IO; namespace csConsole { class NULL { /// /// Reads a double array seperated by a space from a file. /// /// Textfile to read from /// Array of all doubles represented in the file public static double[] DoublesFromFile(string filename) { StreamReader reader = new StreamReader(filename); string text = string.Empty; while( reader.Peek() != -1 ) { text += reader.ReadLine(); } reader.Close(); string[] parts = text.Split(' '); double[] doubles = new double[parts.Length - 1]; for(int i = 0; i < (parts.Length - 1); i++) { doubles[i] = double.Parse( parts[i] ) / 100.00; } return doubles; } #region  Static Main()  static void Main(string[] args) { double[] doubles = NULL.DoublesFromFile( C:\test.txt ); int i = 0; foreach( double d in doubles ) { if( i == 8 ) { Console.Write( 
 ); i = 0; } Console.Write( d +  ); i++; } Console.Read(); } #endregion } }

calfson · Answer

Would it be possible to read the values in directly as double rather than having to convert them from string?

calfson · Answer

Would it be possible to read the values in as type double and bypass having to convert them from string?

bilnaad · Answer

you could either use floats or doubles. But when doubles use more bytes to be represented I would suggest floats (but it's not that important though). just use:(assuming you have the string array ready to go) //strParts: string array of the numbers in literal format float[] fParts = new float[ strParts.Length - 1]; for(int i = 0; i < strParts.Length - 1; i++) { fParts[i] = float.Parse(strParts[i]); } Something like this. Maybe there are typo's in the code because I typed it directly inhere :) Good luck

calfson · Answer

Ok I have one more quick question. Would it be doable to read these numbers in as numbers? And if so what data type is best for that process?

bilnaad · Answer

No sweat :)

calfson · Answer

Yes I did. I have been having problems like this with my computer. I do not think visual studio is running correctly on my machine. This just confirms it. Thanks so much!!!

bilnaad · Answer

No not really my output is this. 5.62; 1.49; 6.53; 3.91; etc... Did you copy/paste the code?

calfson · Answer

When I run the program am I supposed to get the following? 5.62; ; ; 1.49; ; ; 6.53; ; ; and so on?

bilnaad · Answer

Forgot to say that I used the ReadLine() method because else carriage returns are present in the text. And that is what we don't want :)

bilnaad · Answer

The last element in the string just always stayed an empty string or something. Just limited the for loop :) using System; using System.IO; namespace csConsole { class NULL { static void Main(string[] args) { //open the file StreamReader reader = new StreamReader(C:\test.txt); string text = string.Empty; //to store the text while( reader.Peek() != -1 )//while we're not at the end of the file { text += reader.ReadLine(); //append the line of text } reader.Close(); //close file string[] parts = text.Split(' '); //split text by space //the last element in parts is a NULL //so I wrote Length-1 //the ';' I added to look if there are really no spaces left. for(int i = 0; i < (parts.Length - 1); i++) { Console.WriteLine( parts[i] + ; ); } Console.Read(); } } }

calfson · Answer

Thanks a ton. Just to add to that I added some Console.WriteLines to find out how many elements were in the arraylist and it said something like 284. There are only 96 numbers in the file so I'm guessing the other elements are empty strings.

bilnaad · Answer

OK working on it :)

calfson · Answer

Yes I think they are empty strings. Below is the copied and pasted text file I am reading in. 5.62 1.49 6.53 3.91 3.26 3.04 4.47 2.58 2.01 2.00 2.68 4.17 2.85 5.78 6.02 4.65 3.25 4.45 4.73 1.60 2.76 1.75 6.82 0.29 4.41 5.52 12.51 6.89 1.84 2.31 3.70 3.07 0.08 1.10 2.74 6.83 8.22 1.58 4.21 5.29 1.93 3.34 4.38 3.54 4.68 3.56 3.94 2.30 5.86 6.02 8.18 3.69 2.56 2.17 4.68 2.24 0.98 2.03 2.02 5.95 2.95 6.51 3.88 5.42 2.61 11.27 3.32 1.80 4.54 5.07 6.01 2.65 4.58 2.32 4.22 5.78 4.31 3.02 1.77 7.21 4.29 1.00 1.16 7.69 5.22 4.02 8.81 3.06 2.60 3.51 1.24 3.07 5.00 2.59 4.70 6.60

bilnaad · Answer

What do you mean with null values? Are these empty strings or something else? Do you maybe have some sample text and result to show us what is actually happening. This way we can help you more efficient. Greets