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

Is some sort of isnan function available for use with some debugging code near where the output is generated?

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

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Mats