Ruby 带两个参数的Or和语法（| |&&；）

我写这段代码是为了检查一个数字是否是偶数，是否可以被7整除。目的是使用“&&”或“| |”。因为我想要偶数和可被7整除的数，所以它将是“&&”。这是我的代码

input = gets.to_i
def divisible_by_seven?(input)

    div_by_seven = input % 7
    is_even = is_even?(input)

    if div_by_seven == 0 && is_even == true 
        return "is divisible by 7 and is even"

    elsif div_by_seven == 0 && is_even == false
        return "is divisible by 7 but is not even"

    elsif div_by_seven != 0 && is_even == true
        return "is not divisible by 7 but is even"

    else
        return "is not divisible by 7 and is not even"
    end    
end

puts "#{input} #{is_even_and_divisible_by_seven?(input)}"

有没有更好的方法写这篇文章？

当然有

def is_even_and_divisible_by_seven?(input)
  case [(input % 7).zero?, input.even?]
  when [true, true] then "is divisible by 7 and is even"
  when [true, false] then "is divisible by 7 but is not even"
  when [false, true] then "is not divisible by 7 but is even"
  when [false, false] then "is not divisible by 7 and is not even"
end

input = gets.to_i
puts "#{input} #{is_even_and_divisible_by_seven?(input)}"

或

---

一个快速的改进是用

div\u by\u seven=input%7==0

替换

div\u by\u seven=input%7==0

。另外，用

是偶数

替换

是偶数

，或者用

替换
输入。偶数？
，
是偶数==false
！输入。偶数？

def divisible_by_seven_and_even?(input)
  div_by_seven = input % 7 == 0

  if div_by_seven && input.even?
    "is divisible by 7 and is even"
  elsif div_by_seven && !input.even?
    "is divisible by 7 but is not even"
  elsif !div_by_seven && input.even?
    "is not divisible by 7 but is even"
  else
    "is not divisible by 7 and is not even"
  end    
end

---

如果一个整数是偶数（除以2）并除以7，那么它就是除以14。

第8行的“可被5整除”应该是“可被7整除”？什么是“偶数”和“可被7整除”？什么是

是偶数？

？一个快速的改进是将

是偶数==true

替换为

是偶数

，将

是偶数==false

替换为

！甚至是

。谢谢@sawa，但我正在努力使代码使用&操作，这不是问题。

&&

不能被重写，因为它不是一个方法。也不能

|

。你好@sawa。这是有效的（但没有利用&&-I在标题和我的解决方案中都有&&I）。我也可以在原始请求中指定def是_偶数且_可被_七整除？（输入）[（输入%7）.zero？，input.偶数？]end input=get.to _ix，y=is _偶数且_可被_七整除？（输入）put“#{input}是{”not“{x==y？”和“：”但是“}是{”不是“除非y}偶数”

def divisible_by_seven_and_even?(input)
  div_by_seven = input % 7 == 0

  if div_by_seven && input.even?
    "is divisible by 7 and is even"
  elsif div_by_seven && !input.even?
    "is divisible by 7 but is not even"
  elsif !div_by_seven && input.even?
    "is not divisible by 7 but is even"
  else
    "is not divisible by 7 and is not even"
  end    
end