[Webinar] Streamline your web hosting managementRegister Today

x
?
Solved

Open Text File of Numbers into an Array

Posted on 1998-12-06
3
Medium Priority
?
191 Views
Last Modified: 2010-04-02
I have a text file with a header row of variables and the rest as numbers in columns.  I can open the file using getline but it reads the number rows as a string.  What I then have to do is break each string of row numbers down by looking for tab spaces, converting the string to a number, and then saving it into an array.  Can somebody please tell me the easiest way to open a text file of numbers with various rows and columns into an array?

Thanks
0
Comment
Question by:dmontgom
3 Comments
 
LVL 5

Expert Comment

by:yonat
ID: 1179457
int i;
while (cin >> i) {
    // do stuff with i
}

0
 
LVL 22

Expert Comment

by:nietod
ID: 1179458
i.e what yonat is saying is that the standard library is capable of reading the ASCII data and converting the digits into integers (or other numerical types)  so don't read the data in as ASCII characters, read it in as the numerical type you want.
0
 
LVL 1

Accepted Solution

by:
billyh earned 400 total points
ID: 1179459
Hope this helps:

#include "fstream.h"
#include "iostream.h"

#ifndef MAXLEN
      #define MAXLEN 45
#endif

void main()
{
      char header_row[MAXLEN];
      fstream in_text_file;
      int local_var = 0, index = 0, int_arr[MAXLEN];

      in_text_file.open("text.dat",ios::in);

      while(!in_text_file.eof())
      {
            if (!local_var)
            {
                  in_text_file.getline(header_row,MAXLEN,'\n');
                  ++local_var;
            }
            else
            {
                  in_text_file >> local_var;
                  int_arr[index] = local_var;
                  ++index;
            }
      }

      in_text_file.close();
}
0

Featured Post

2018 Annual Membership Survey

Here at Experts Exchange, we strive to give members the best experience. Help us improve the site by taking this survey today! (Bonus: Be entered to win a great tech prize for participating!)

Question has a verified solution.

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

Written by John Humphreys C++ Threading and the POSIX Library This article will cover the basic information that you need to know in order to make use of the POSIX threading library available for C and C++ on UNIX and most Linux systems.   [s…
  Included as part of the C++ Standard Template Library (STL) is a collection of generic containers. Each of these containers serves a different purpose and has different pros and cons. It is often difficult to decide which container to use and …
The goal of the video will be to teach the user the concept of local variables and scope. An example of a locally defined variable will be given as well as an explanation of what scope is in C++. The local variable and concept of scope will be relat…
The viewer will learn how to clear a vector as well as how to detect empty vectors in C++.

607 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