Unexpected result adding float numbers

[wdantuma (Willem)]

The following snippet

import "fmt"

func main() {
	a := 8.9
	b := 2.2
	c := a + b
	fmt.Printf("%g\n", c)
}

Returns 11.100000000000001 but i expect 11.1

What am i doing wrong ?

Thanks

[Metalymph (lorenzo pirro)]

Hi @wdantuma ! In Go if you to want format correctly a float number with a specific number of decimals, you need to use %.Nf where N is the number of digits you want.
In your case change:

@wdantuma

fmt.Printf("%g\n", c)

with fmt.Printf("%.1f\n", c). The formatter %g represents the float number with its maximum number of significant digits, and in your case you’re using two float64 so Go fills all the right 14 digits automatically

[NobbZ (Norbert Melzer)]

That’s just float…

If you need accurate results, just don’t use floats.

Some background info:

https://0.30000000000000004.com/

[wdantuma (Willem)]

Thanks both, i should have known