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Asked: 2026-05-10T21:17:26+00:00

I have been banging my head on this one all day. The C++ project

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I have been banging my head on this one all day. The C++ project I am currently working on has a requirement to display an editable value. The currently selected digit displays the incremented value above and decremented value below for said digit. It is useful to be able to reference the editable value as both a number and collection of digits. What would be awesome is if there was some indexable form of a floating point number, but I have been unable to find such a solution. I am throwing this question out there to see if there is something obvious I am missing or if I should just roll my own.

Thanks for the advice! I was hoping for a solution that wouldn’t convert from float -> string -> int, but I think that is the best way to get away from floating point quantization issues. I ended up going with boost::format and just referencing the individual characters of the string. I can’t see that being a huge performance difference compared to using combinations of modf and fmod to attempt to get a digit out of a float (It probably does just that behind the scenes, only more robustly than my implementation).

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  1. Internal representation of the float point numbers aren’t like was you see. You can only cast to a stirng.

    To cast, do this:

    char string[99]; sprintf(string,'%f',floatValue);

    Or see this : http://www.parashift.com/c++-faq-lite/misc-technical-issues.html#faq-39.1

    The wikipedia article can explain more on the representation: http://en.wikipedia.org/wiki/Floating_point

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