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POFile I/O in Every Programming Language
 

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    <p>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. </p> <p>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.</p> <p>I myself know how to do it in <code>C</code>, <code>C++</code> and <code>Objective-C</code>, 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: <code>python</code>, <code>ruby</code> and of course <code>perl</code>. </p> <p>So I figure here we can create a <strong><em>community resource</em></strong> that we can all <strong><em>star</em></strong> to our profiles and refer to when we need to do <strong>file I/O</strong> 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.</p> <p><strong>This is how you need to answer:</strong></p> <ol> <li>Create a new text file called "<strong>fileio.txt</strong>"</li> <li>Write the first line "hello" to the text file.</li> <li>Append the second line "world" to the text file.</li> <li>Read the second line "world" into an input string.</li> <li>Print the input string to the console.</li> </ol> <p><strong>Clarification:</strong></p> <ul> <li>You should show how to do this in one programming language per answer only.</li> <li>Assume that the text file doesn't exist beforehand</li> <li>You don't need to reopen the text file after writing the first line</li> </ul> <p>No particular limit on the language. <code>C</code>, <code>C++</code>, <code>C#</code>, <code>Java</code>, <code>Objective-C</code> are all great. </p> <p>If you know how to do it in <code>Prolog</code>, <code>Haskell</code>, <code>Fortran</code>, <code>Lisp</code>, or <code>Basic</code> then please go right ahead.</p>
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    1. COCan we assume that fileio.txt don't already exist or do we have to turncate a pre-existing fileio.txt file?
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    2. COassume that the text file doesn't exist
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    3. COAt least IMO, it would be (drastically) more useful if the example had to deal with EOF. I don't remember seeing a question that I could point this as answering, but *constantly* see questions where they want to read a whole file and deal with EOF incorrectly.
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