https://play.golang.org/p/0XRLg6-6uPk
On Thu, Feb 22, 2018 at 1:09 PM, andrey mirtchovski <[email protected]> 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, <[email protected]> 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? > > > > -- > > You received this message because you are subscribed to the Google Groups > > "golang-nuts" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to [email protected]. > > For more options, visit https://groups.google.com/d/optout. > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- Michael T. Jones [email protected] -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
