Hi group,
1.
Is there a package can do exact float operations, like Decimal in Python? For
example:
x := 0.1; y := 0.2; z := x + y;
z will be exact 0.3
2.
Why literal operation is exact, variable is not?
fmt.Println(0.1 + 0.2) // 0.3 exactly
fmt.Println(x + y) // 0.30000000000000004
Thanks
func main() {
x := 0.1
y := 0.2
fmt.Println("x + y :", x + y)
fmt.Println("literal:", 0.1 + 0.2)
x = 0.1
y = 0.35
fmt.Println("x + y :", x + y)
fmt.Println("literal:", 0.1 + 0.35)
}
/*
$ go build && ./main
x + y : 0.30000000000000004
literal: 0.3
x + y : 0.44999999999999996
literal: 0.45
$
*/
// Python:
// >>> 0.1 + 0.2
// 0.30000000000000004
// >>> float(Decimal('0.1') + Decimal('0.2'))
// 0.3
// >>>
// >>> 0.35 + 0.1
// 0.44999999999999996
// >>> float(Decimal('0.35') + Decimal('0.1'))
// 0.45
// >>>
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