Re: floating-point abuse in 2.1.113

[Richard B. Johnson]

On Tue, 4 Aug 1998, Albert D. Cahalan wrote:

> 
> Mikael Pettersson writes:
> 
> > -                       v.rangelow=(int)(87.9*16);
> > -                       v.rangehigh=(int)(107.8*16);
> > +                       v.rangelow=(879*16)/10;
> > +                       v.rangehigh=(1078*16)/10;
> 
> How can that be a problem? Shouldn't the multiplication and cast
> be evaluated at compile time, leaving only an int?

The problem is the "."  in 88.9, etc. This means "float". It should
be something like 889/10, but you don't want to do the division
immediately. The stuff with the "+" is the correct way. It will
be evaluated at compile time to be 1406 for the 87.9 range.

Cheers,
Dick Johnson
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