# # BigDecimal utility library. # # To use these functions, require 'bigdecimal/util' # # The following methods are provided to convert other types to BigDecimals: # # String#to_d -> BigDecimal # Float#to_d -> BigDecimal # Rational#to_d -> BigDecimal # # The following method is provided to convert BigDecimals to other types: # # BigDecimal#to_r -> Rational # # ---------------------------------------------------------------------- # class Float < Numeric def to_d BigDecimal(self.to_s) end end class String def to_d BigDecimal(self) end end class BigDecimal < Numeric # Converts a BigDecimal to a String of the form "nnnnnn.mmm". # This method is deprecated; use BigDecimal#to_s("F") instead. def to_digits if self.nan? || self.infinite? || self.zero? self.to_s else i = self.to_i.to_s s,f,y,z = self.frac.split i + "." + ("0"*(-z)) + f end end # Converts a BigDecimal to a Rational. def to_r sign,digits,base,power = self.split numerator = sign*digits.to_i denomi_power = power - digits.size # base is always 10 if denomi_power < 0 Rational(numerator,base ** (-denomi_power)) else Rational(numerator * (base ** denomi_power),1) end end end class Rational < Numeric # Converts a Rational to a BigDecimal def to_d(nFig=0) num = self.numerator.to_s if nFig<=0 nFig = BigDecimal.double_fig*2+1 end BigDecimal.new(num).div(self.denominator,nFig) end end