float_util.go
1.43 KB
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package webutility
import (
"fmt"
"math"
"math/big"
"strings"
)
func RoundFloat64(f float64, dec int) float64 {
p := math.Pow(10, float64(dec))
return math.Round(f*p) / p
}
func NewBF(f float64, prec uint) *big.Float {
x := big.NewFloat(f)
x.SetPrec(prec)
return x
}
func AddBF(x, y *big.Float) *big.Float {
z := big.NewFloat(0.0)
z.SetPrec(x.Prec())
z.Add(x, y)
return z
}
func SubBF(x, y *big.Float) *big.Float {
z := big.NewFloat(0.0)
z.SetPrec(x.Prec())
yneg := big.NewFloat(0.0)
yneg.Neg(y)
z.Add(x, yneg)
return z
}
func MulBF(x, y *big.Float) *big.Float {
z := big.NewFloat(0.0)
z.SetPrec(x.Prec())
z.Mul(x, y)
return z
}
func DivBF(x, y *big.Float) *big.Float {
z := big.NewFloat(0.0)
z.SetPrec(x.Prec())
z.Quo(x, y)
return z
}
func BFtoFloat(f *big.Float) float64 {
v, _ := f.Float64()
return v
}
func Float64ToString(f float64) string {
return fmt.Sprintf("%.2f", f)
}
func Float64PtrToString(f *float64) string {
if f == nil {
return ""
}
return fmt.Sprintf("%.2f", *f)
}
func FormatFloat64Number(f float64, dec int) string {
res := ""
f = RoundFloat64(f, dec)
i := int64(f)
format := fmt.Sprintf("%%.%df", dec)
parts := strings.Split(fmt.Sprintf(format, f-float64(i)), ".")
decimals := parts[1]
res = FormatInt64Number(i) + "," + decimals
return res
}
func MaxFloat64(vars ...float64) (max float64) {
max = vars[0]
for _, v := range vars {
if v > max {
max = v
}
}
return max
}