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