473,609 Members | 2,103 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

REading from file

20 New Member
I'm trying to read from a text file. The format of the text file is


1999 78686
2000 78999
2001 80003
............... .....
............... .....
............... ....
2002 45489 (so forth).

I want to be able to count how many rows are there and also add all the values in the second column.

I want to know how do I go about storing the values once i read the file? should I just increment each line or use Arrays?
Mar 24 '08 #1
3 1236
gpraghuram
1,275 Recognized Expert Top Contributor
Are u using C or C++?
If C you can go for arrays
If C++ go for Vector as you can sort using the stl alogorithm.


Raghuram
Mar 24 '08 #2
romcab
108 New Member
HI,
You can parse the file using strtok or you create your own by reading each line and separate it by space. You can determine how many rows by reading each line using fgets and use a counter.
Mar 24 '08 #3
TKM
11 New Member
1) Get the data using the %d data type
2) use counter to determine whether data is from the 1st or 2nd column and save them in arrays. Use a counter to count the number of items saved
Mar 24 '08 #4

Sign in to post your reply or Sign up for a free account.

Similar topics

4
3052
by: Xah Lee | last post by:
# -*- coding: utf-8 -*- # Python # to open a file and write to file # do f=open('xfile.txt','w') # this creates a file "object" and name it f. # the second argument of open can be
1
7041
by: fabrice | last post by:
Hello, I've got trouble reading a text file (event viewer dump) by using the getline() function... After 200 - 300 lines that are read correctly, it suddenly stops reading the rest of the file... Thank you to all of you who can help me with this one...
19
10296
by: Lionel B | last post by:
Greetings, I need to read (unformatted text) from stdin up to EOF into a char buffer; of course I cannot allocate my buffer until I know how much text is available, and I do not know how much text is available until I have read it... which seems to imply that multiple reads of the input stream will be inevitable. Now I can correctly find the number of characters available by: |
4
9818
by: Oliver Knoll | last post by:
According to my ANSI book, tmpfile() creates a file with wb+ mode (that is just writing, right?). How would one reopen it for reading? I got the following (which works): FILE *tmpFile = tmpfile(); /* write into tmpFile */ ...
6
6337
by: Rajorshi Biswas | last post by:
Hi folks, Suppose I have a large (1 GB) text file which I want to read in reverse. The number of characters I want to read at a time is insignificant. I'm confused as to how best to do it. Upon browsing through this group and other sources on the web, it seems that there are many ways to do it. Some suggest that simply fseek'ing to 8K bytes before the end of file, and going backwards is the way. In this case, am I guaranteed best results...
1
2011
by: Need Helps | last post by:
Hello. I'm writing an application that writes to a file a month, day, year, number of comments, then some strings for the comments. So the format for each record would look like: mdyn"comment~""comment~"\n Now, I wrote some code to read these records, and it works perfectly for every date I've tried it on, except when the day is 26. I tried saving a record for 6/26/2004 and 7/26/2004 and it read it in as the day, year, and number of...
7
6053
by: John Dann | last post by:
I'm trying to read some binary data from a file created by another program. I know the binary file format but can't change or control the format. The binary data is organised such that it should populate a series of structures of specified variable composition. I have the structures created OK, but actually reading the files is giving me an error. Can I ask a simple question to start with: I'm trying to read the file using the...
5
14980
blazedaces
by: blazedaces | last post by:
Ok, so you know my problem, java is running out of memory reading with SAX, the event-based xml parser intended more-so than DOM for extremely large files. I'll try to explain what I've been doing and why I have to do it. Hopefully someone has a suggestion... Alright, so I'm using a gps-simulation program that outputs gps data, like longitude, lattitude, altitude, etc. (hundreds of terms, these are just the well known ones). In the newer...
6
3520
by: efrenba | last post by:
Hi, I came from delphi world and now I'm doing my first steps in C++. I'm using C++builder because its ide is like delphi although I'm trying to avoid the vcl. I need to insert new features to an old program that I wrote in delphi and it's a good opportunity to start with c++.
2
2832
by: Derik | last post by:
I've got a XML file I read using a file_get_contents and turn into a simpleXML node every time index.php loads. I suspect this is causing a noticeable lag in my page-execution time. (Or the wireless where I'm working could just be ungodly slow-- which it is.) Is reading a file much more resource/processor intensive than, say, including a .php file? What about the act of creating a simpleXML object? What about the act of checking the...
0
8035
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it. First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
0
8534
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. Here is my compilation command: g++-12 -std=c++20 -Wnarrowing bit_field.cpp Here is the code in...
1
8188
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
0
6969
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
0
4002
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
0
4059
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
1
2502
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
1
1630
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.
0
1366
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.