能否新建一个数据类型？

喵呜喵5

RUBY 代码复制

class Fraction
  attr_accessor :numerator, :denominator  
  def initialize(array)
    @numerator = array[0].to_i    
    @denominator = array[1].to_i
    raise "分母不为0" if @denominator == 0
    reduction
  end
  # 极其简陋的约分（破坏性）
  def reduction
    @denominator = 1 if @numerator == 0
    [@denominator, @numerator, 2, 3, 5, 7].each do |i|
      next if i == 1 || i == -1 || i == 0
      while @numerator % i == 0 && @denominator % i == 0        
        @denominator /= i; @numerator /= i
      end
    end
    self
  end
  # 取负数（破坏性）
  def -@; self.numerator = -self.numerator; self; end
  # 取倒数（破坏性）
  def reciprocal
    self.numerator ,self.denominator = self.denominator, self.numerator
    self
  end  
  # 将整数转换为分数
  def change_to_fraction(number)
    return Fraction.new([number,1]) if number.class != Fraction
    number
  end
  # 加
  def +(number)
    r = self.clone
    n = change_to_fraction(number)
    r.numerator *= n.denominator
    r.numerator += n.numerator * r.denominator
    r.denominator *= n.denominator    
    r.reduction    
  end
  # 乘
  def *(number)
    n = change_to_fraction(number)
    r = self.clone
    r.denominator *= n.denominator
    r.numerator *= n.numerator
    r.reduction
  end
  # 减
  def -(number); self.+(-number); end
  # 除
  def /(number); self.*(change_to_fraction(number).reciprocal); end
 
  # 数据类型的转换
  def to_f; @numerator.to_f / @denominator; end
  def to_i; @numerator / @denominator; end
  def to_s
    return @numerator.to_s if @denominator == 1
    "#{@numerator}/#{@denominator}"
  end
end
 
 
a = Fraction.new([1,4])
b = Fraction.new([2,3])
 
p a + b
p a - 1
p b * 3
p b / a

class Fraction


  attr_accessor :numerator, :denominator  


  def initialize(array)


    @numerator = array[0].to_i    


    @denominator = array[1].to_i


    raise "分母不为0" if @denominator == 0


    reduction


  end


  # 极其简陋的约分（破坏性）


  def reduction


    @denominator = 1 if @numerator == 0


    [@denominator, @numerator, 2, 3, 5, 7].each do |i|


      next if i == 1 || i == -1 || i == 0


      while @numerator % i == 0 && @denominator % i == 0        


        @denominator /= i; @numerator /= i


      end


    end


    self


  end


  # 取负数（破坏性）


  def -@; self.numerator = -self.numerator; self; end


  # 取倒数（破坏性）


  def reciprocal


    self.numerator ,self.denominator = self.denominator, self.numerator


    self


  end  


  # 将整数转换为分数


  def change_to_fraction(number)


    return Fraction.new([number,1]) if number.class != Fraction


    number


  end


  # 加


  def +(number)


    r = self.clone


    n = change_to_fraction(number)


    r.numerator *= n.denominator


    r.numerator += n.numerator * r.denominator


    r.denominator *= n.denominator    


    r.reduction    


  end


  # 乘


  def *(number)


    n = change_to_fraction(number)


    r = self.clone


    r.denominator *= n.denominator


    r.numerator *= n.numerator


    r.reduction


  end


  # 减


  def -(number); self.+(-number); end


  # 除


  def /(number); self.*(change_to_fraction(number).reciprocal); end


 


  # 数据类型的转换


  def to_f; @numerator.to_f / @denominator; end


  def to_i; @numerator / @denominator; end


  def to_s


    return @numerator.to_s if @denominator == 1


    "#{@numerator}/#{@denominator}"


  end


end


 


 


a = Fraction.new([1,4])


b = Fraction.new([2,3])


 


p a + b


p a - 1


p b * 3


p b / a