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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
# # => #<BigDecimal:1008ef070,'0.42E2',9(36)>
#
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
# # => #<BigDecimal:1dc69e0,'0.5E0',9(18)>
#
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
# # => #<BigDecimal:1dc69e0,'0.5E0',9(18)>
#
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(precision) -> bigdecimal
#
# Converts a Rational to a BigDecimal.
#
# The required +precision+ parameter is used to determine the amount of
# significant digits for the result. See BigDecimal#div for more information,
# as it is used along with the #denominator and the +precision+ for
# parameters.
#
# r = (22/7.0).to_r
# # => (7077085128725065/2251799813685248)
# r.to_d(3)
# # => #<BigDecimal:1a44d08,'0.314E1',18(36)>
def to_d(precision)
if precision <= 0
raise ArgumentError, "negative precision"
end
num = self.numerator
BigDecimal(num).div(self.denominator, precision)
end
end
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