mirror of
https://github.com/c9s/bbgo.git
synced 2024-11-14 02:53:50 +00:00
54 lines
864 B
Go
54 lines
864 B
Go
package util
|
|
|
|
import (
|
|
"math"
|
|
"strconv"
|
|
)
|
|
|
|
const MaxDigits = 18 // MAX_INT64 ~ 9 * 10^18
|
|
|
|
var Pow10Table = [MaxDigits + 1]int64{
|
|
1, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9, 1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18,
|
|
}
|
|
|
|
func Pow10(n int64) int64 {
|
|
if n < 0 || n > MaxDigits {
|
|
return 0
|
|
}
|
|
return Pow10Table[n]
|
|
}
|
|
|
|
func FormatFloat(val float64, prec int) string {
|
|
return strconv.FormatFloat(val, 'f', prec, 64)
|
|
}
|
|
|
|
func ParseFloat(s string) (float64, error) {
|
|
if len(s) == 0 {
|
|
return 0.0, nil
|
|
}
|
|
|
|
return strconv.ParseFloat(s, 64)
|
|
}
|
|
|
|
func MustParseFloat(s string) float64 {
|
|
if len(s) == 0 {
|
|
return 0.0
|
|
}
|
|
|
|
v, err := strconv.ParseFloat(s, 64)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return v
|
|
}
|
|
|
|
const epsilon = 0.0000001
|
|
|
|
func Zero(v float64) bool {
|
|
return math.Abs(v) < epsilon
|
|
}
|
|
|
|
func NotZero(v float64) bool {
|
|
return math.Abs(v) > epsilon
|
|
}
|