Re: Multiplying fixed-point by long integer

[Jeffrey Carter <spam.jrcarter.not@spam.not.acm.org>]

On 10/04/2012 06:46 PM, Adam Beneschan wrote:
>
> 4.5.5 defines predefined multiplication operators between any fixed-point
> type and Integer.  However, it isn't defined for any other integer type.
> This can cause a problem if I have an integer type whose bounds are larger
> than Integer, since it obviously won't work to convert it to Integer.  Has
> anyone encountered this problem before, and how did you solve it?  I'm
> hesitant to try to solve it by converting things to floating point, since the
> mantissa of a floating-point may have fewer bits than the fixed-point or
> integer type, and fixed-point multiplication by an integer should be exact.

Do the integer values fit in the range of the fixed-point type? If so, you could 
convert to the fixed-point type.

If not, then the fixed-point abs value must be < 1, and you're dividing the 
integer value by 1/'Small. That might give you some idea how to proceed.

-- 
Jeff Carter
"C++ is vast and dangerous, a sort of Mordor of
programming languages."
Jason R. Fruit
120

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