bbgo_origin/util/math.go
2020-10-03 11:11:59 +08:00

56 lines
866 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
}