[0，0]的未定义方法&#39;&lt;&#39;：Array <NoMethodError>

Question

I am beginner of Ruby programming. My program is count number of even length of words in a given string. But it's shows the following Error

Undefined method '<' for [0, 0] :Array

Here is My code

def even(words, n)
   i = 0, m = 0
   while i < n do
       count = count + words[i].length
       if count%2 == 0 then
          m = m + 1
       end
       i = i + 1
  end
  return m
end
prinnt "Enter The String:"
s = gets.chomp
words = s.split()
n = words.length
x = even(words, n)
puts x

Answer 1

I think your problem is here

i = 0, m = 0

make it

i = 0
m = 0

Edit:

Also like Kai König said, if you call it like that it means

" now's  the time".split        #=> ["now's", "the", "time"]

http://ruby-doc.org/core-1.9.3/String.html#method-i-split

Answer 2

Here's how I'd do it:

'this is a string'.split.select{ |w| w.size % 2 == 0 }.size # => 3

Applying to gets :

gets.chomp.split.select{ |w| w.length % 2 == 0 }.size

Answer 3

The others have already explained to you what the immediate error is in your code. However, the bigger problem is that your code is just not idiomatic Ruby code.

Idiomatic code would look something like this:

puts gets.split.map(&:length).count(&:even?)

And, as you can see, there is simply no way that you could even make a mistake such as the one you made.

Answer 4

Try it

 def even(words, n)
     i = 0
     m = 0
     count = 0
      while i < n do
        count = count + words[i].length
        if count%2 == 0 then m = m + 1 end
        i = i + 1
      end
      return m
      end
      print "Enter The String:"
      s = gets.chomp
      words = s.split("")
      n =  words.length
      #p n 
      x = even(words, n)
      puts x