Thread: scanf properties in c

  1. #1
    Registered User
    Join Date
    Nov 2020

    scanf properties in c

    the example that i took from deitels book there is a code as seen below
    while (scanf("%d%[^0-9-]%lf", &account, name, &balance) != EOF) {
    can you explain what does it mean %[^0-9-] why do we put - in the code.
    thanks in advance.

  2. #2
    Registered User
    Join Date
    Feb 2019
    %[^...] means the same as %s but excludes those characters (in your case from '0' to '9' and '-').

    Another thing: scanf() returns EOF only if any of the conversions can't be done and if you reach the END OF FILE in a file stream. stdin will not reach the end of file, so this is an infinite loop (except if you hit ^D on Unix terminal).

    scanf() also retuns the number of successful conversions...

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