File IO in Every Language

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Welcome to the start of another Sample Programs in Every Language series! Today, we’re kicking off File IO in Every Language, a series about file interaction.

Table of Contents

What is File IO?

For those who aren’t aware, IO is short for Input/Output. Append “File” to the front of that string to get a concept known as File IO: the basis of file reading and writing. In this series, we define File IO as any program which writes to a file and reads from that same file.

In particular, languages in this series should be able to write some arbitrary text to a file called output.txt, read that text back, and present it to the user. For example, let’s say the following text is what we want to write to a file:

This is a line of text.

And, this is another line of text.

Then, a File IO in Every Language program should write this text to output.txt, read the text back, and display it to the user like:

This is a line of text.
And, this is another line of text.

To verify that the program worked, check that a file called output.txt has been created, and that it contains the text above. That’s it!

Why File IO in Every Language?

To be honest, I didn’t come up with this idea. One of our biggest contributors, Noah, did. As a result, I have them to thank for this awesome series. In fact, many of the programs in this series were implemented by Noah, so give them a shout out in the comments.

That said, File IO can be a very important part of any system. In fact, I do a bit of File IO for this site. Every image you see on The Renegade Coder was generated by a Python programOpens in a new tab. that uses file IO to read images and create new ones.

In general, File IO can be useful in all sorts of automation. I’m sure a lot of people have written little scripts to eliminate some busy work from their jobs. I’ve done that. Why update a file every day when you can automatically update it with scripting?

My point is File IO is important, and I think it makes a great addition to the Sample Programs in Every Language series.

An Alphabetical List of Languages

As usual, here’s a list of articles organized alphabetically:

  1. File IO in C++
  2. File IO in Python
  3. File IO in Ruby

Once again, thanks for sticking around. If you’re enjoying this site, consider becoming a memberOpens in a new tab.. At least that way, you’ll be able to share your recommendations in the comments. At any rates, until next time!

Sample Programs in Every Language (44 Articles)—Series Navigation

For 100 Days of Code, I’ve decided to implement a few sample programs in as many languages as possible. Each implementation details a brief history of the language and a description of the code.

The plan for the series is to explore the major general-purpose language like Java, Python, C, C++, and C#. From there, we’ll take a look at some sample programs in web development languages like Ruby, PHP, and JavaScript. As we continue, we’ll cover proprietary languages like Swift and Objective-C. Eventually, we’ll start to tackle less popular languages like Rust, x86, and Verilog. Finally, we’ll play around with some of the esoteric languages like Brainf*ck and LOLCODE.

Who knows? Maybe the Sample Programs in Every Language series will become so popular it’ll never end. To help this series grow, consider sharing it on social media with your friends. Or, if you have a language you want to see, drop your suggestion in the comments.

Jeremy Grifski

Jeremy grew up in a small town where he enjoyed playing soccer and video games, practicing taekwondo, and trading Pokémon cards. Once out of the nest, he pursued a Bachelors in Computer Engineering with a minor in Game Design. After college, he spent about two years writing software for a major engineering company. Then, he earned a master's in Computer Science and Engineering. Today, he pursues a PhD in Engineering Education in order to ultimately land a teaching gig. In his spare time, Jeremy enjoys spending time with his wife, playing Overwatch and Phantasy Star Online 2, practicing trombone, watching Penguins hockey, and traveling the world.

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