Re: [Mingw-users] How to recover a float from binary unsigned equiv. value ?

[Roberto R. <rob...@ar...>]

Thanks a lot, Peter & Duncan. union work great !

Roberto Ricardi wrote:

> Hi all,
>
> I got a float single, manage it in a binary form in an unsigned int. 
> And wish to recover the float form.
> The magnitudes range never be greather than  +/- 32k.
>
> to  manage a float we can do: Sign * 2^m * 1.F ( where m = E -127 and 
> F = mantissa).
>
> To reconstruc with:
>
> r = 0.0 /* this is float */
> n = Mantisa /* unsigned, mantissa constructed in binary */
> n = n | 0x3F800000; /* this meant 'or' with E-127 = 0, positive */
>
> now try to 'or' the binary equiv. in the float variable
>
> r = r | n;  /* meant 1.F */
>
> compiler cant manage float and unsigned 'or', maybe assuming not both 
> 32 bits long ?
> the next cant be managed too, of course:
>
> r = 2^m * r; /* meant 2^m * 1.F */
>
> How can I construct a float from a binary unsigned equiv. value ?
>
> Thanks a lot in advance
>
> Rob
>
>
>
>
>
>
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