[DGD]Extensions interface: floats

[Michael J. Bacon]

> To go from C float to DGD_FLOAT_T, use:

>    sign = (f < 0);
>    mantissa = ldexp(frexp(f, &exponent), 37);
>    --exponent;
>    DGD_FLOAT_PUT(DGDflt, sign, exponent, mantissa);


	FYI: This seemed to work great for floats > 0 but floats < 0 were coming
out wrong.  I changed it as follows and it seems to work:

	mantissa = ldexp(frexp(fabs(f), &exponent), 37);

Thanks;
Michael.


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