Solved

Reading External Text Files

Posted on 1998-11-22
8
176 Views
Last Modified: 2012-05-04
How do I read in a list of names from an external text file? I would like to read in two lists of alphabetized names from separate text files and merge them into one alphabetical list.  I would also like to print out any name from either of the two external lists, say the 5th name of list2.  Any help in this matter would be greatly appreciated.  
0
Comment
Question by:willie117
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 5
  • 2
8 Comments
 

Author Comment

by:willie117
ID: 1216168
e-mail is jayleff@aol.com
0
 
LVL 1

Expert Comment

by:FuzzyLogic
ID: 1216169
To merge two ordered lists into one list is easy, and I can give you basic code for that.

However, when you said "print out any name...", do you mean that:
A. The program waits for user query and writes out the answer  (and wait for another query)?
B. The user give his query at command-line and the program processes his query?

Fuzzy
0
 

Author Comment

by:willie117
ID: 1216170
Once the list is compiled, the user then can query, say for the 4th name in the list.
0
Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

 
LVL 27

Expert Comment

by:BigRat
ID: 1216171
It really depends how big the files are and how long the names are. If the files are relatively small and the names less than say 60 characters you can hold all of it in memory. For example assume the names are on one line in the file :-
       Homer Simpson
       Heffer Wolf
       Barney Rubble
    and so on, up to say several hundred, the creating a list like :-

     PNameList = ^TNameList;
     TNameList = record
                 Next : PNameList;
                 Name : PChar;
                 end;
   while not(EOF(Input)) do
      begin
      Readln(Input,Name);
      new(Entry);
      Entry^.Next:=List;
      List^.Name:=StrNew(Name);
      List:=Entry;
      end;
in memory gives you a simple list. All the names are stored on the heap. If this is waht you are thing about reply and we'll lok further!. If not ignore it!
     have ratitude
0
 

Author Comment

by:willie117
ID: 1216172
That looks good, the files are small and the names are less than 60.  Also is it possible to use an array with this?
0
 
LVL 27

Accepted Solution

by:
BigRat earned 100 total points
ID: 1216173
Yes, you would have an array of PChar :-
const
   MaxCount = 1000;
type
   TNameArray = array[1..MaxCount] of PChar;
var
   NameArray : TNameArray;
   Name        : packed array[0..60 of Char];
   Leng         : Integer;

   Leng:=0;
   while not Eof(Input) do
      begin
      Readln(Input,Name);
      Inc(Leng);
      NameArray[Leng]:=StrNew(Name);
      end;

The elements are then 1..Leng.

For further Info (if you need it) reject this answer.
0
 

Author Comment

by:willie117
ID: 1216174
Thank you for your answer.  It is most helpful.  One last question though (I'm not the best programmer) how do I access the individual elements?  Thanks.  Have ratitude!
0
 

Author Comment

by:willie117
ID: 1216175
I think I asked my question too fast: I think I access the elements with: NameArray[1], NameArray[2], ... or with NameArray[Leng].  
0

Featured Post

On Demand Webinar: Networking for the Cloud Era

Did you know SD-WANs can improve network connectivity? Check out this webinar to learn how an SD-WAN simplified, one-click tool can help you migrate and manage data in the cloud.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

After seeing many questions for JRNL_WRAP_ERROR for replication failure, I thought it would be useful to write this article.
Microsoft is moving in-place eDiscovery & hold from ECP to EOP console under Content Search in Search and Investigation Options.  In this post, I will be showing you how to export emails to a PST file using the Content Search Options.
If you’ve ever visited a web page and noticed a cool font that you really liked the look of, but couldn’t figure out which font it was so that you could use it for your own work, then this video is for you! In this Micro Tutorial, you'll learn yo…
Add bar graphs to Access queries using Unicode block characters. Graphs appear on every record in the color you want. Give life to numbers. Hopes this gives you ideas on visualizing your data in new ways ~ Create a calculated field in a query: …

707 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question