Writing to .DAT files

This is a discussion on Writing to .DAT files within the C++ Programming forums, part of the General Programming Boards category; I've been looking at lots of examples, but i can't seem to write variables to a .DAT file in Dev-c++. ...

  1. #1
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    Writing to .DAT files

    I've been looking at lots of examples, but i can't seem to write variables to a .DAT file in Dev-c++. Can anyone show me an example on hoow to do this?

  2. #2
    The larch
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    Can you write variables to any other file? A dat file is no different (the file extension doesn't really matter, they are there just to associate certain files with a particular program, e.g bmp->Paint)

    Code:
    std::ofstream fout("datafile.dat");
    fout << myvariable;

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    Does that work in an app?

  4. #4
    (?<!re)tired Mario F.'s Avatar
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    what do you mean?
    Originally Posted by brewbuck:
    Reimplementing a large system in another language to get a 25% performance boost is nonsense. It would be cheaper to just get a computer which is 25% faster.

  5. #5
    The larch
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    Quote Originally Posted by Xinco
    Does that work in an app?
    ???

    Is your question how to write to a file or how to write to a *.dat file? If it is the former you should try to find a tutorial on file input/output with C++. If it's the latter, you do it the same you'd write to a *.txt file...

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    I meant an app(.exe) where the user enters a variable and the app saves this variable to a .dat file

  7. #7
    C++ Witch laserlight's Avatar
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    I meant an app(.exe) where the user enters a variable and the app saves this variable to a .dat file
    What do you mean by "the user enters a variable"? Basically, the file extension only means what you make it out to be. Treat a file named "filename.dat" as you would a file named "filename", and proceed as usual.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  8. #8
    Frequently Quite Prolix dwks's Avatar
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    See anon's first example.

    Also see this tutorial: http://www.cprogramming.com/tutorial/lesson10.html
    dwk

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