c file to extract real value from a txt file

Thread Tools Search this Thread
Top Forums Programming c file to extract real value from a txt file
# 8  
Old 02-04-2008
Originally Posted by user_prady
Dear Friends,

I am really in a great problem.
My problem is as follows

If I will send a counter to a function in c like read_line(counter);

Then it will read that line only which counter is pointing ,
Suppose I ve txt file like below


Then If I'll call the function as read_line(2);

It should read the 2nd line only and then put that value to a double pointer..

I mean one function call should read only the specified row,, and store it to a double pointer..

I need help badly..
One way you could do this is by moving the sscanf part of the code into the read_line() function. This way you just need to increment the variable by 1 after every call to fgets. After calling fgets you can invoke read_line() and pass the counter as an argument to it and inside read_line() the double floating number will be stored at the address specified by the double pointer using sscanf.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

To extract values after the maximum value in a txt file

Hello, I'm new to scripting and I need to write a bash script. Here is example of file on which I'm working: 0.3092381 0.3262799 0.3425480 0.3578379 0.3719490 0.3846908 0.3958855 0.4053738 0.4130160 0.4186991 0.4223357 ... (1 Reply)
Discussion started by: jeo_fb
1 Replies

2. Shell Programming and Scripting

Extract information from txt file

Hello! I need help :) I have a file like this: AA BC FG RF TT GH DD FF HH (a few number of rows and three columns) and I want to put the letters of each column in a variable step by step in order to give them as input in another script. So I would like to obtain: for the 1 loop:... (11 Replies)
Discussion started by: edekP
11 Replies

3. Shell Programming and Scripting

Script extract text from txt file with grep

All, I require a script that grabs some text from the gitHub API and will grep (or other function) for a string a characters that starts with (") quotes followed by two letters, may contain a pipe |, and ending with ) . What i have so far is below but it's not returning anything. ... (4 Replies)
Discussion started by: ChocoTaco
4 Replies

4. Windows & DOS: Issues & Discussions

2 Questions: replace text in txt file, add text to end of txt file

so... Lets assume I have a text file. The text file contains multiple "#" symbols. I want to replace all thos "#"s with a STRING using DOS/Batch I want to add a certain TEXT to the end of each line. How can I do this WITHOUT aid of sed, grep or anything linux related ? (1 Reply)
Discussion started by: pasc
1 Replies

5. Shell Programming and Scripting

Need to append the date | abcddate.txt to the first line of my txt file

I want to add/append the info in the following format to my.txt file. 20130702|abcd20130702.txt FN|SN|DOB I tried the below script but it throws me some exceptions. <#!/bin/sh dt = date '+%y%m%d'members; echo $dt+|+members+$dt; /usr/bin/awk -f BEGIN { FS="|"; OFS="|"; } { print... (6 Replies)
Discussion started by: harik1982
6 Replies

6. Shell Programming and Scripting

Command to extract all columns except the last few from a txt file

hello, i have publicly available txt file with little less than 300000 rows. i want to extract from column 1 to column 218 and save it in another text file. i use the cut command but the file is saved with multiple rows from the source file onto a single row in the destination. basically it is... (6 Replies)
Discussion started by: madrazzii
6 Replies

7. Shell Programming and Scripting

awk append fileA.txt to growing file B.txt

This is appending a column. My question is fairly simple. I have a program generating data in a form like so: 1 20 2 22 3 23 4 12 5 43 For ever iteration I'm generating this data. I have the basic idea with cut -f 2 fileA.txt | paste -d >> FileB.txt ???? I want FileB.txt to grow, and... (4 Replies)
Discussion started by: theawknewbie
4 Replies

8. UNIX for Dummies Questions & Answers

Extract numbers from .txt file

I need to extract all the p-value numbers and the rho numbers from a .txt file and write them as coma separated values in a new file. Ideally I would get two files in the end, one for p- values and one for rho. Any suggestions? I appreciate your help!!! The .txt file looks essentially like this... (5 Replies)
Discussion started by: eggali
5 Replies

9. Shell Programming and Scripting

Extract from txt file

I have data as follow in the txt file. I want to skip line starting with '#' sign. #command program abc defmt exp refmt ... ... I want to store abc exp .... in a array. I want to store defmt refmt in a array I need command to read each line in the file. I need... (6 Replies)
Discussion started by: ekb
6 Replies

10. UNIX for Dummies Questions & Answers

Binary txt file received when i use uuencode to send txt file as attachment

Hi, I have already read a lot of posts on sending attachments in unix...but none of them were of help for my problem...so here goes.. i wanna attach a text file and send to a mail id..used the following code : uuencode "$File1" "$File1" ;|mail -s "$Mail_sub" abc@abc.com it works... (2 Replies)
Discussion started by: ash22
2 Replies
Login or Register to Ask a Question
Vend::CounterFile(3pm)					User Contributed Perl Documentation				    Vend::CounterFile(3pm)

Vend::CounterFile - Persistent counter class SYNOPSIS
use Vend::CounterFile; $c = new Vend::CounterFile "COUNTER", "aa00"; $id = $c->inc; open(F, ">F$id"); DESCRIPTION
(This module is modified from Gisle Aas File::CounterFile to use Interchange's locking protocols -- lack of fcntl locking was causing counter problems.) This module implements a persistent counter class. Each counter is represented by a separate file in the file system. File locking is applied, so multiple processes might try to access the same counters at the same time without risk of counter destruction. You give the file name as the first parameter to the object constructor ("new"). The file is created if it does not exist. If the file name does not start with "/" or ".", then it is interpreted as a file relative to $Vend::CounterFile::DEFAULT_DIR. The default value for this variable is initialized from the environment variable "TMPDIR", or /usr/tmp is no environment variable is defined. You may want to assign a different value to this variable before creating counters. If you pass a second parameter to the constructor, that sets the initial value for a new counter. This parameter only takes effect when the file is created (i.e. it does not exist before the call). When you call the "inc()" method, you increment the counter value by one. When you call "dec()" the counter value is decrementd. In both cases the new value is returned. The "dec()" method only works for numerical counters (digits only). You can peek at the value of the counter (without incrementing it) by using the "value()" method. The counter can be locked and unlocked with the "lock()" and "unlock()" methods. Incrementing and value retrieval is faster when the counter is locked, because we do not have to update the counter file all the time. You can query whether the counter is locked with the "locked()" method. There is also an operator overloading interface to the Vend::CounterFile object. This means that you might use the "++" operator for incrementing the counter, "--" operator for decrementing and you can interpolate counters diretly into strings. BUGS
(This problem alleviated by this modified module) It uses flock(2) to lock the counter file. This does not work on all systems. Perhaps we should use the File::Lock module? COPYRIGHT
Copyright (c) 1995-1998 Gisle Aas. All rights reserved. Modifications made by and copyright (C) 2002 Red Hat, Inc. and (c) 2002-2007 Interchange Development Group This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. AUTHOR
Gisle Aas <aas@sn.no> perl v5.14.2 2010-03-25 Vend::CounterFile(3pm)