ruby - 计算 ruby 的百分比？

Question

<分区>

Answer 1

你的意思是这样percentage = a/b*100？

根据您的新描述更新:

class Numeric
  def percent_of(n)
    self.to_f / n.to_f * 100.0
  end
end

# Note: the brackets () around number are optional
p (1).percent_of(10)    # => 10.0  (%)
p (200).percent_of(100) # => 200.0 (%)
p (0.5).percent_of(20)  # => 2.5   (%)

pizza_slices = 5
eaten = 3
p eaten.percent_of(pizza_slices) # => 60.0 (%)

基于 Mladen 的代码。