From: "Tim 'Zastai' Van Holder" <zastai AT hotmail DOT com>
Newsgroups: comp.os.msdos.djgpp
References: <Pine DOT GHP DOT 4 DOT 21 DOT 0008251135110 DOT 14459-100000 AT falcon DOT csrv DOT uidaho DOT edu>
Subject: Re: Importing text into a char array
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Date: Sat, 26 Aug 2000 17:18:29 GMT
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

"David Roon" <roon8505 AT uidaho DOT edu> wrote in message
news:Pine DOT GHP DOT 4 DOT 21 DOT 0008251135110 DOT 14459-100000 AT falcon DOT csrv DOT uidaho DOT edu...
>
>
> ---------- Forwarded message ----------
> Hullo, folks...
>
> I'm writing a program to analyze genetic data- I'd like to be able to
> import numerical data from a text file and assign it to elements within a
> char array. Is there some way to use the getline() function for this, or
> do I need some other approach?
>
Depends on how much you know of the file format; if it's well-defined
(for example, each line starts with a word with no embedded whitespace,
followed by a set of numbers), you could just use the >> operator (C++) or
fscanf (C).
If the format of the file is less clear-cut, a more robust system would be
needed; this would probably involve reading the file line by line (or char
by char) and then trying to parse the data in it yourself.
However, from what you describe, it's likely the input file will be well-
formatted, so the following (C++) programlet will likely do what you want:

#include <fstream>
#include <deque>

using namespace std;

int
main(void)
{
  // Open the input file for reading
ifstream fin("genetic.dat", ios::in | ios::text);
  // Prepare an array to hold the data; I use a deque here for
  // the convenient push_back; of course a vector or valarray
  // may be more appropriate.
deque<double> data;
double value;
  fin >> value; // get first value
  while (!fin.eof ()) {
    data.push_back(value);
    fin >> value;
  }
  // Now process the data
  Analyze(data);
  // And we're done
  return 0;
}

If C is required, I'm sure some other kind soul will be willing to post
the C equivalent of this.

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