Thread: Usage of ungetch funtion.

  1. 03-09-2009 #1
    pawanspace
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    Smile Usage of ungetch funtion.

    Hi All,

    I have been working with java from a long time, I have never worked with C programming language...I am from electronics background so was not in touch with these languages...I have started learning C language these days...and I have found it awesome...atleast I will get something to write as a code...not like java where every thing is provided in packages...I have one question I am searching for the usage of ungetch function, I have found definition everywhere but I couldn't found an example which can explain the usage. Kindly help me on this. I hope to get a positive reply from you guys and also kindly let me know a good ID for C. Thanks!!

    Regards,
    Pawan Chopra.
  2. 03-09-2009 #2
    cpjust
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    It's not a standard C function and I've never seen nor used it.
    That's all I can tell you.
    If I had to guess, I'd say it puts a character back into the stdin stream.
    "I am probably the laziest programmer on the planet, a fact with which anyone who has ever seen my code will agree." - esbo, 11/15/2008

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  3. 03-09-2009 #3
    Snafuist
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    Citing from the manpage of ungetc(3):

    int ungetc(int c, FILE *stream);

    [...]

    ungetc() pushes c back to stream, cast to unsigned char, where it is available for subsequent read operations. Pushed-back characters will be returned in reverse order; only one pushback is guaranteed.

    [...]

    Conforming To
    C89, C99.
    The Linux manpages are pretty good. If you need help with common C functions, use "linux man <function>" in Google/linux.die.net or, if you're working in a Unix environment, type "man <function>" in the terminal.

    ungetch() may be anything, definitely not standard. Most commonly, this is some sort of Windows stuff or the ungetch() function from the (n)curses library. Same trick as above also applies here.

    Greets,
    Philip
    Last edited by Snafuist; 03-09-2009 at 07:08 AM.
    All things begin as source code.
    Source code begins with an empty file.
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  4. 03-09-2009 #4
    laserlight
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    ungetch is not ungetc, though the idea is similiar.
    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
  5. 03-09-2009 #5
    Snafuist
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    I should stop writing my posts incrementally and instead start a new post...

    Greets,
    Philip
    All things begin as source code.
    Source code begins with an empty file.
    -- Tao Te Chip
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