package webutility
  
  import (
  	"fmt"
  	"math"
  	"math/big"
  )
  
  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)
  }