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semmons99/gist:1053857

Created June 29, 2011 13:42
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bankers rounding
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gistfile1.rb
def round(n)
cents = n * BigDecimal("100")
remainder = cents % BigDecimal("1")
if remainder == BigDecimal("0")
n
elsif remainder < BigDecimal("0.5")
n.round(2, BigDecimal::ROUND_DOWN)
elsif remainder > BigDecimal("0.5")
n.round(2, BigDecimal::ROUND_UP)
elsif cents.even?
n.round(2, BigDecimal::ROUND_DOWN)
else
n.round(2, BigDecimal::ROUND_UP)
end
end
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