File I/O in Every Programming Language

file-io language-agnostic programming-languages
Brock Woolf picture Brock Woolf · Aug 21, 2010 · Viewed 84.9k times · Source

This has to be a common question that all programmers have from time to time. How do I read a line from a text file? Then the next question is always how do i write it back.

Of course most of you use a high level framework in day to day programming (which are fine to use in answers) but sometimes it's nice to know how to do it at a low level too.

I myself know how to do it in C, C++ and Objective-C, but it sure would be handy to see how it's done in all of the popular languages, if only to help us make a better decision about what language to do our file io in. In particular I think it would be interesting to see how its done in the string manipulation languages, like: python, ruby and of course perl.

So I figure here we can create a community resource that we can all star to our profiles and refer to when we need to do file I/O in some new language. Not to mention the exposure we will all get to languages that we don't deal with on a day to day basis.

This is how you need to answer:

  1. Create a new text file called "fileio.txt"
  2. Write the first line "hello" to the text file.
  3. Append the second line "world" to the text file.
  4. Read the second line "world" into an input string.
  5. Print the input string to the console.

Clarification:

  • You should show how to do this in one programming language per answer only.
  • Assume that the text file doesn't exist beforehand
  • You don't need to reopen the text file after writing the first line

No particular limit on the language. C, C++, C#, Java, Objective-C are all great.

If you know how to do it in Prolog, Haskell, Fortran, Lisp, or Basic then please go right ahead.

Answer

Danita picture Danita · Aug 22, 2010

LOLCODE

The specs are sketchy to say the least, but I did the best I could. Let the downvoting begin! :) I still find it a fun exercise.

HAI
CAN HAS STDIO?
PLZ OPEN FILE "FILEIO.TXT" ITZ "TehFilez"?
    AWSUM THX
        BTW #There is no standard way to output to files yet...
        VISIBLE "Hello" ON TehFilez
        BTW #There isn't a standard way to append to files either...
        MOAR VISIBLE "World" ON TehFilez
        GIMMEH LINES TehLinez OUTTA TehFilez
        I HAS A SecondLine ITZ 1 IN MAH TehLinez
        VISIBLE SecondLine
    O NOES
        VISIBLE "OH NOES!!!"
KTHXBYE

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