Thread: Starting over - Hopefully just a quick questions about C

  1. 08-05-2016 #1
    knik653
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    Starting over - Hopefully just a quick questions about C

    First off, my thanks for those who responded to my other post and advanced apologies for the "messiness" that happened with my first post.

    Now given that, I am have reduced my original problem to the following scenario.

    I read in some data from memory that is in ASCII format into an int_32 array.

    Then I need to compare/ treat some of the data as a string and some as a integer.


    My questions
    1. What will happen if I store ASCII into an integer array? How will be stored?
    For example I read "1234" from memory into an variable of int32_type x, what exactly will be stored in x?

    Thank you all again.
  2. 08-05-2016 #2
    Salem
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    It depends what you mean by 'store'

    You could take the numeric value of "1234" as 1234 and store that in your int32 variable.
    In hex, you would be looking at 4 bytes containing 00 00 04 D2

    Or you could store the 4-byte string in the integer, where each byte of the string maps to a byte within the int32.
    You might end up with 4 bytes containing 31 32 33 34
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  3. 08-06-2016 #3
    c99tutorial
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    Could you post the actual code involved with this question? Then it will be easier to answer concretely. Specifically show how you are reading "1234" and how you are storing into an integer.
    C99 Tutorial
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