Organizing this...

[.:hacker:.]

Hi, it's me again and I have a couple quick questions .

Let's say I have number data on an editpad/notepad file, how would I organize that into a table (with text borders) using a 2-D array? I've got the thing to compile and all, but it only prints out one line:

code:

public class Assign5 {     public static void ArrayOne (String [] args) throws IOException     {     int [][] precipitation = new int [5][7];                   for (int i = 0; i < 5; i++)         {         for (int j = 0; j<3; j++)         {         precipitation [5][7] = 0;         }             }         }         // The main method     public static void main (String [] args) throws IOException         {               // variables for the averages         int averAll;         int averNorth;         int averApril;         int highJune;         int lowest;         int secondlow;               FileInputStream precip;         DataInputStream In;         String fileInput = "";           try         {         precip = new FileInputStream("precipitation.txt");                 In = new DataInputStream (precip);                 fileInput = In.readLine();         System.out.print (fileInput);                 In.close();     }         catch (FileNotFoundException e)     {         System.out.println("Error - this file does not exist");     }             catch (IOException e)     {         System.out.println ("error=" + e.toString ());       }     }

Or... do I need to change it into an output instead of an input, i'm not sure. I wrote the file like this but it only prints out the months:

Month North East South West
Jan.
Feb.
Mar. (numbers go here)
Apr.
May
Jun.

Also, once I've got the file in there how would I calculate averages and other related things this way...? I'm not completely sure.

[wtd]

Let's try some decently formatted code for starters.

Java:

public class Assign5 {    public static void ArrayOne (String [] args) throws IOException    {       int [][] precipitation = new int [5][7];                 for (int i = 0; i < 5; i++)       {          for (int j = 0; j < 3; j++)          {             precipitation[5][7] = 0;          }       }    }        // The main method    public static void main (String [] args) throws IOException    {        // variables for the averages        int averAll;        int averNorth;        int averApril;        int highJune;        int lowest;        int secondlow;              FileInputStream precip;        DataInputStream In;        String fileInput = "";              try        {           precip = new FileInputStream("precipitation.txt");                   In = new DataInputStream (precip);                   fileInput = In.readLine();           System.out.print (fileInput);                   In.close();        }        catch (FileNotFoundException e)        {           System.out.println("Error - this file does not exist");        }        catch (IOException e)        {           System.out.println ("error=" + e.toString ());        }     } }

Now...

Java:

for (int i = 0; i < 5; i++)       {          for (int j = 0; j<3; j++)          {             precipitation[5][7] = 0;          }       }

You're trying to set everything equal to zero. Yet, you're just assigning 0 to precipitation[5][7] over and over.

Your next problem: that doesn't exist. When you declare a 2D array with: [5][7] that means it is five seven element arrays. They start at zer, though, so the highest you can go is 4 and 6.

Java:

DataInputStream In;

Variables in Java always begin with a lowercase letter.

Java:

In.close();

This should go in a "finally" block.

[.:hacker:.]

So... if I started at one, woud be able to go higher?

Heh heh... sorry if this sounds like a stupid question.

[wtd]

.:hacker:. wrote:

So... if I started at one, woud be able to go higher?

Heh heh... sorry if this sounds like a stupid question.

All arras in Java have a starting index of zero. Can't change it.