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r/significant_figures.rb

Created December 7, 2009 00:22
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significant_figures.rb
def significant_figures(num)
sn = num.to_s.sub(/e[-+]*\d+$/i, '') # remove the scientific notation
sn = sn.sub(/0*$/, '') unless sn.include?('.') # remove any trailing zeros
sn.sub('.', '').sub(/^[-+]?0*/, '').length # remove the sign, leading zeros
end
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