Questions tagged [io]
In computing, input/output, or I/O, refers to the communication between an information processing system (such as a computer) and the outside world (possibly a display, an information storage system, or another information processing system).
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Extracting text data from a file
Can I make this program that extracts text data from a file (size in MBs) even better performance-wise? I need to reduce the execution time.
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Speed up CSV reading code (vector of doubles)
I am trying to read a single-columned CSV of doubles into Java with a string header. It is 11 megabytes and takes over 15 minutes to read, which is clearly ...
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Node.js equivalent of cat -n or nl
To add line numbers to a file (via stdin to stdout) we can use cat -n or ...
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Writing .ppm images to a file
I am struggling with commenting and variable naming. My teacher says my comments need to be more explanatory and explicit. He says my variable names are also sometimes confusing. I was just wondering ...
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Parsing store sales content from a text file
I asked this question yesterday, and now I have come up with this code:
stock.h
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Partial data reading implementation
I'm trying to learn Python and am working on a simple Tiled Map Format (.tmx) reader as practice. So as to not post too much code at once, I'm only publishing the ...
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Life, the Universe, and Everything [closed]
Your program is to use the brute-force approach in order to find the Answer to Life, the Universe, and Everything. More precisely... rewrite small numbers from input to output. Stop processing input ...
user28990
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Reading in a file and performing string manipulation
In a question I answered I posted the following code:
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user25057
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Java PrintWriter not printing data to file [closed]
This program is compiling just fine, and the variables and such seem to be passing through. However, when I open the text file there is no data. Can anyone point me in the right direction or nudge ...
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Reading three rows of six tab-separated numbers
I've just posted this solution in my review of @adrienlucca's question, which is to read three rows of six tab-separated doubles.
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Writing integer to binary file
I wrote a python function that writes a integer to a file in binary form. But are there any ways that I can reduce the number of steps, is there a more efficient way to write a integer to a file?
<...
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Better importation of variables from .txt file
I am an artist and a total beginner in C++.
I would like to find a better method of importing my variables from a values.txt file, which may contain 18 values in ...
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Reading Large Files in Java getting really slow
I am trying to read a large file ~200 MB (~300 million lines of text). I am using a relatively standard way of reading like:
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Floating-Point data input in Bash and C
I wrote a function that dynamically stores statistical data. I tried to clone the functionality of how I had originally written my solution in Bash. Is there perhaps something I could improve, or do ...
user27606
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Is this file I/O utility efficient or is there a lot of fat?
This is a class/method that manages files being written to and read from. I have a lot of code, and it grew as I tried to get it to work properly. Is there a better way to write this (i.e. trim the ...
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Simple I/O class for reading input data fast
I wrote a FastReader utility class that is supposed to read input fast. It's mostly aimed at parsing input files in competitive programming.
How could I made this ...
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K&R 1-20 Converting tabs to spaces using idiomatic C
I'm learning C with K&R 2nd Ed. I just completed exercise 1-20 (which is the detab program). I was hoping to get some feedback on my work. I want to make ...
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Attempting to efficiently compute the largest prime factor
I'm working on the third Euler problem and I've written a simple little function that returns the list of prime factors of a given number.
The number for which I have to get all the factors is over 6 ...
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Vocabulary trainer passing around too much IO/State
I've written a vocabulary trainer which does a lot of passing state around, as I have an ACID-database and a temporary state.
In my experience with Haskell I've learnt that overusing ...
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Reading a file into string in Java
I am quite new to Java, and I am trying to read a file into a string (or should I use byte arrays for this?). File can be anything, such as a text file or executable file etc. I will compress what I ...
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File I/O, SHA1 sum and compression
The function hash_blog is inspired by "how git stores its objects". It is supposed to take a String, append a header to it, ...
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Abstraction for an IO device
I have a C++ class which acts as an abstraction for an IO device which is controlled through file descriptors. As I am very new to C++, I would be glad if you can give me devastating feedback on ...
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Verifying column and line counts
I have created this simple code:
For the size of an array with 2 values (n and m), verify if ...
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Detecting a combination of characters from input
Write a program that reads input up to # and reports the number of times that
the sequence ei occurs.
Is this a decent code?
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Mingw, wcout and locales
I've recently had to print some national symbols in windows console using Mingw and found, that I got nothing in the output, if I use wide strings.
So, I studied ...
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C getline function
I was looking for a C function that reads lines of arbitrary length from a file. I didn't find anything absolutely portable and safe from buffer overflows, so I tried writing my own.
Does it look ...
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User prompts for entering quiz questions
I have two methods here that does the same thing: get the user input and validate them.
If they enter a letter, the program will prompt them again to enter a number. |After that, if it's a number it ...
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Simple text file I/O for book data
I wanted to learn how to work with file I/O properly and found an assignment in my college papers and decided to write it:
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Reading a .gz file
I am using Python 2.6.5 and am trying to find the fastest way to print out the contents of a .gz file. It's my understanding that prior to v2.5, zcat was much faster than gzip (see here)....I guess ...
usr951
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Ranking lines of a file according to number of occurrences
I recently dived into Ruby, so I want to improve this code. Is this good enough?
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Handle Java Process outputs without extra-threads
Usually, people would create two extra-threads in order to read the standard output and error respectively. However, the following code would allow to handle a Process outputs without those threads (...
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Slow web-scraping geolocator
How do I make my Python program faster?
I have 3 suspects right now for it being so slow:
Maybe my computer is just slow
Maybe my Internet is too slow (sometimes my program has to download the html ...
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File reader/writer using XPConnect, ActiveX, LiveConnect, Java, HTML5 file storage, or HTTP
I am writing a file writer/reader in JavaScript; I want it to work on local files.
It tries to use Firefox's XpConnect, falls back on IE activeX, falls back on Java LiveConnect, falls back on a Java ...
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Redirecting subprocesses' output (stdout and stderr) to the logging module
I'm working on a Python script and I was searching for a method to redirect stdout and stderr of a subprocess to the logging ...
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Reading a large XML file and parsing necessary elements into MySQLdb
I have fair concept in a programming (learner) but not an expert to refactor code at the highest level. I am trying to read a huge (100MB-2GB) XML file and parse necessary element (attributes) from a ...
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Iterating through 128-byte records in a file
I need to read records from a flat file, where each 128 bytes constitutes a logical record. The calling module of this below reader does just the following.
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