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Internal Sort Program

Posted on 1998-11-09
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Last Modified: 2010-04-30
This program is required to read a text file of country currency rates into array, sort the array, then output the sorted array as a text file. How do you load the text file into array and how do you sort it?
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Question by:gongsher
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8 Comments
 
LVL 15

Expert Comment

by:ameba
ID: 1443977
Read file, sort, write file...
3 questions. I will add 1 more:
How does your file look like. Is it coma separated?
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Author Comment

by:gongsher
ID: 1443978
Its a sequential file that has a file size of maximum 50 records, record length of fixed 40 bytes and the record layout should be the following:

CountryCode   text    4 bytes
CountryName   text    20 bytes
BuyRate       text    8 bytes
SellRate      text    8 bytes

Example of input file:
05  Australia    0.8656    0.8498
02  Japan        62.54     61.08
Up to about 50 records

Have to load the input file records into the array on User selection of the Sort button.  It should sort the array elements into ascending Country Code order and then output into another text file.



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LVL 1

Expert Comment

by:lawnranger
ID: 1443979
Look at a recent word joust between me and Waty at http://www.experts-exchange.com/topics/comp/lang/visualbasic/Q.10078969!
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Author Comment

by:gongsher
ID: 1443980
First, I would just like to know how exactly do you load the text file into array?

What I have done is:

' Opening the input file which contains 40 bytes
Open (App.Path & "\Input.txt") For Random As #1 Len = 40

How do you load the file as array and then output it to another text file? The file contains 50 records and the output should be like the following:

05  Australia    0.8656    0.8498
02  Japan        62.54     61.08
Up to 50 records.

Thanks!



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Author Comment

by:gongsher
ID: 1443981
As I mentioned above, I would like to know firstly how to load a text file into an array.
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LVL 2

Accepted Solution

by:
dabellei earned 100 total points
ID: 1443982
Private Sub load_Click()
    nfic = FreeFile
    Dim texte_share As String
   
    Open "c:\input.txt" For Input As #1
    Do While Not EOF(nfic)
        Line Input #nfic, texte_share
        List1.AddItem texte_share
    Loop
    Close #1
   

End Sub

Private Sub save_Click()
    nfic = FreeFile
    Dim texte_share As String
   
    Open "c:\inputs.txt" For Binary Access Write As #1
    For x = 0 To List1.ListCount - 1
        texte$ = List1.List(x) & Chr(13) & Chr(10)
        Put #1, , texte$
    Next x
    Close #1

End Sub

Put two button (load and save) and a listbox (sorted = true) on
a form
0
 

Author Comment

by:gongsher
ID: 1443983
dabellei

I have written a code here but it is definitely not right. Just wondering if you can have a check and correct. The form should only have one button, (sort button) and a message will come up after sorting, displaying the number of records sorted.
It should open the "ERInput.txt" file, load into array, sort the array and then output the sorted file into ascending Country Code order into the file "EROutput.txt"

Option Explicit
Type ExchangeRate
    strCountryCode as string *4
    strCountryName as string *20
    strBuyRate as string *8
    strSellRate as string *8
End Type
Public gExchangeRate (1 to 50) as ExchangeRate

Option Explicit
Dim intNumber As Integer
Dim intIndex As Integer
Dim intArrayNum As Integer
Dim intPrevArrayNum As Integer
Dim udtCountryRate As ExchangeRate

Private Sub cmdSort_Click()
Open (App.Path & "\ERInput.txt") For Random As #1 Len =_     Len(gExchangeRate(1))

intNumber = LOF(1) / Len(gExchangeRate(1))

If LOF(1) / Len(gExchangeRate(1)) > 0 Then
    For intIndex = 1 To LOF(1) / Len(gExchangeRate(1))
        Get #1, intIndex, gExchangeRate(intIndex)
    Next intIndex
End If

For intArrayNum = 2 To intNumber
    udtCountryRate = gExchangeRate(intArrayNum)
   
    For intPrevArrayNum = intArrayNum - 1 To 1 Step -1
        If Val(udtCountryRate.strCountryCode) >= Val(gExchangeRate(intPrevArrayNum). _
            strCountryCode) Then
                Exit For
        Else
            gExchangeRate(intPrevArrayNum + 1) = gExchangeRate(intPrevArrayNum)
        End If
    Next intPrevArrayNum
    gExchangeRate(intPrevArrayNum + 1) = udtCountryRate
Next intArrayNum

Open (App.Path & "\EROutput.txt") For Output As #2 Len = Len(gExchangeRate(1))

For intArrayNum = 1 To intNumber
    'Put #2, (intArrayNum), gExchangeRate(intArrayNum)
    Print #2, gExchangeRate(intArrayNum).strCountryCode;
    Print #2, gExchangeRate(intArrayNum).strCountryName;
    Print #2, gExchangeRate(intArrayNum).strBuyRate;
    Print #2, gExchangeRate(intArrayNum).strSellRate;
Next intArrayNum
Close #2

lblMessage = intNumber & " exchange rate records sorted."
Exit Sub
End Sub


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LVL 2

Expert Comment

by:dabellei
ID: 1443984
i'll take a look at your code and return with it soon
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