class Integer < Numeric # call-seq: # int.to_d -> bigdecimal # # Convert +int+ to a BigDecimal and return it. # # require 'bigdecimal' # require 'bigdecimal/util' # # 42.to_d # # => # # def to_d BigDecimal(self) end end class Float < Numeric # call-seq: # flt.to_d -> bigdecimal # # Convert +flt+ to a BigDecimal and return it. # # require 'bigdecimal' # require 'bigdecimal/util' # # 0.5.to_d # # => # # def to_d(precision=nil) BigDecimal(self, precision || Float::DIG+1) end end class String # call-seq: # string.to_d -> bigdecimal # # Convert +string+ to a BigDecimal and return it. # # require 'bigdecimal' # require 'bigdecimal/util' # # "0.5".to_d # # => # # def to_d BigDecimal(self) end end class BigDecimal < Numeric # call-seq: # a.to_digits -> string # # Converts a BigDecimal to a String of the form "nnnnnn.mmm". # This method is deprecated; use BigDecimal#to_s("F") instead. # # require 'bigdecimal' # require 'bigdecimal/util' # # d = BigDecimal.new("3.14") # d.to_digits # # => "3.14" def to_digits if self.nan? || self.infinite? || self.zero? self.to_s else i = self.to_i.to_s _,f,_,z = self.frac.split i + "." + ("0"*(-z)) + f end end # call-seq: # a.to_d -> bigdecimal # # Returns self. def to_d self end end class Rational < Numeric # call-seq: # r.to_d -> bigdecimal # r.to_d(sig) -> bigdecimal # # Converts a Rational to a BigDecimal. Takes an optional parameter +sig+ to # limit the amount of significant digits. # # r = (22/7.0).to_r # # => (7077085128725065/2251799813685248) # r.to_d # # => # # r.to_d(3) # # => # def to_d(precision) if precision <= 0 raise ArgumentError, "negative precision" end num = self.numerator BigDecimal(num).div(self.denominator, precision) end end