Thread: stdin question

  1. #1
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    stdin question

    hello!

    I want to use stdin twice. Is it possible at all? For example, when I use stdin

    while(!feof(stdin)) printf("%c", getc(stdin));

    and now does the stdin exist in the memory anymore?

    I want to use the same stdin stream again.

    or must I copy the data in stdin to the memory first?

  2. #2
    Registered User Cela's Avatar
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    stdin is always open in your program unless you do something unadvisable like fclose it :-)
    *Cela*

  3. #3
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    ok, then how do I return to the beginning of stdin
    rewind(stdin);
    doest work

  4. #4
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    thanks

  5. #5
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    no actualy I want something something like this

    ./program < data // from command promt

    while (!feof(stdin){
    printf("%c",getc(stdin));
    }

    return to beginning of stdin.

    printf("\n\n\n");

    while (!feof(stdin){
    printf("%c",getc(stdin));
    }

    output should be:

    contest of file data
    3 gaps
    contest of file data
    Last edited by oomen3; 02-19-2003 at 01:11 PM.

  6. #6
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    [oomen@localhost]./program < data

    the data is not command line argument but "<" send the data to the program as input stream

  7. #7
    ATH0 quzah's Avatar
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    Originally posted by oomen3
    [oomen@localhost]./program < data

    the data is not command line argument but "<" send the data to the program as input stream
    The input stream is not rewindable. It is not a standard file. It is not something that stores an indefinate amount of input so that you can go back and read what happend a while ago.

    You'll have to do what Salem suggests. If you don't like it, buffer the input in your program as you read it, and go back and start reading from your internal buffer again.

    Quzah.
    Hope is the first step on the road to disappointment.

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