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Это тест разных видов округллений и их комбинаций при валютном обмене
def round_math a
(a*100).round.to_f/100
end
def ceil_math a
(a*100).ceil.to_f/100
end
def floor_math a
(1*100).floor.to_f/100
end
def forward a
round_math a
# ceil_math a
# floor_math a
end
def back a
round_math a
# ceil_math a
# floor_math a
end
wrong, total = 0, 0
for i in (100...300)
for j in (1...31)
x = i.to_f + ((rand*100).round.to_f)/100
f = round_math 1 - j.to_f/100
delta_x = back(forward(x/f)*f)
if x != delta_x
p '--------------------------------'
p "x = #{x}; f = #{f}"
p "round(x/f) = #{forward(x/f)}"
p "round(round(x/f)*f) = #{delta_x}"
p '--------------------------------'
wrong += 1
end
total += 1
end
end
p "total = #{total}"
p "wrong = #{wrong}"
p "error = #{wrong.to_f/total}"
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