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#
# BigDecimal <-> Rational
#
class BigDecimal
# Convert BigDecimal to Rational
def to_r
sign,digits,base,power = self.to_parts
numerator = sign*digits.to_i
denomi_power = power - digits.size # base is always 10
if denomi_power < 0
denominator = base ** (-denomi_power)
else
denominator = base ** denomi_power
end
Rational.new(numerator,denominator)
end
end
class Rational
# Convert Rational to BigDecimal
# to_d returns an array [quotient,residue]
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
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