https://play.golang.org/p/0XRLg6-6uPk
On Thu, Feb 22, 2018 at 1:09 PM, andrey mirtchovski <mirtchov...@gmail.com>
wrote:
> in the first Printf "area" is truncated. try %.40f to see the real
> value, which is more like:
>
> 262256.4523014638689346611499786376953125
>
> plugging that in as h2 will result in
> 39709429597.00000098280725069344043731689453125 (according to wolfram
> alpha)
>
> On Thu, Feb 22, 2018 at 1:32 PM, <steve_bagw...@sil.org> wrote:
> >
> > Hello Everyone,
> >
> > This looks like a Golang bug to me. What do you all think?
> >
> > I have this function ...
> >
> >> func getArea(base, side int64) float64 {
> >> var height, fSide, area float64
> >> fSide = float64(side)
> >> halfBase := float64(base) / 2.0
> >> height = math.Sqrt(fSide*fSide - halfBase*halfBase)
> >> area = halfBase * height
> >> fmt.Printf("halfBase: %f, height: %f, Area: %f\n", halfBase, height,
> area)
> >
> >
> >>
> >> hb2 := 151414.5
> >> h2 := 262256.452301
> >> fmt.Printf("Area 2: %f\n", hb2 * h2)
> >
> >
> >>
> >> return area
> >> }
> >
> >
> > When I call it with `result := getArea(302829, 302828)`, I get this
> output
> > ...
> >
> >> halfBase: 151414.500000, height: 262256.452301, Area: 39709429597.000000
> >> Area 2: 39709429596.929764
> >
> >
> > I could see how some kind of rounding could produce the first Area value.
> > But in that case, why wouldn't Area2 be rounded as well?
> >
> > --
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--
Michael T. Jones
michael.jo...@gmail.com
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