实数上的红宝石力整数除法

Question

你如何在ruby中强制实数的整数除法？

# integer division with integers - no problem
>> [ 7/2 , 7%2 ]
=> [3, 1]

# integer division with floats - '%' gives the remainder just fine...
# ...but for the quotient it used real division
>> [ 7.0/2 , 7.0%2 ]
=> [3.5, 1.0]

# This is what happens with non integer-y floats
>> [ 7.1/2 , 7.1%2 ]
=> [3.55, 1.0999999999999996]

我想要[ 3.0, 1.1 ]。假设这不能在vanilla ruby​​中完成并需要使用gem？

Answer 1

Numeric#divmod来救援：

7.1.divmod 2
#⇒ [
#  [0] 3,
#  [1] 1.0999999999999996
# ]

或者，仅适用于商部分（归功于@Stefan）：

7.1.div 2
#⇒ 3

Answer 2

试试这个

require 'bigdecimal'
d = BigDecimal.new(7.1, 2)
 => #<BigDecimal:7fc2b199ab30,'0.71E1',18(27)>
d.divmod(2).map(&:to_f)
 => [3.0, 1.1]