sprintf of float giving "1.#QO"

This is a discussion on sprintf of float giving "1.#QO" within the C++ Programming forums, part of the General Programming Boards category; Hi, I am having an intermittent problem. It's a C++ program written in VC++ 6.0 (very old, I know). It's ...

  1. #1
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    sprintf of float giving "1.#QO"

    Hi,

    I am having an intermittent problem. It's a C++ program written in VC++ 6.0 (very old, I know). It's a fairly complex application with some fairly complex mathematical calculations. Most of it wasn't written by me. Anyway, every once in a while one of the fields on the screen shows "1.#QO" instead of the proper result. This MIGHT be just the beginning of the string, because of the size of the field is limited.

    I am sure it's a bad calculation somewhere that probably results in an invalid floating point number. Does anyone have an idea that could help me narrow my search?

    Thanks

  2. #2
    Just Lurking Dave_Sinkula's Avatar
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    Is some sort of isnan function available for use with some debugging code near where the output is generated?
    7. It is easier to write an incorrect program than understand a correct one.
    40. There are two ways to write error-free programs; only the third one works.*

  3. #3
    Kernel hacker
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    You may also find enabling x87 exceptions may help:
    http://msdn2.microsoft.com/en-us/library/e9b52ceh.aspx

    --
    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

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