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40 lines
835 B
Go
40 lines
835 B
Go
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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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var NegPow10Table = [MaxDigits + 1]float64{
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1, 1e-1, 1e-2, 1e-3, 1e-4, 1e-5, 1e-6, 1e-7, 1e-8, 1e-9, 1e-10, 1e-11, 1e-12, 1e-13, 1e-14, 1e-15, 1e-16, 1e-17, 1e-18,
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}
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func NegPow10(n int64) float64 {
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if n < 0 || n > MaxDigits {
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return 0.0
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}
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return NegPow10Table[n]
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}
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func Float64ToStr(input float64) string {
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return strconv.FormatFloat(input, 'f', -1, 64)
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}
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func Float64ToInt64(input float64) int64 {
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// eliminate rounding error for IEEE754 floating points
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return int64(math.Round(input))
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}
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