If I write:

  def add(i,j)
    i = i + j
  end

  i = 1

  puts i
  add(i,3)
  puts i

I get

  1
  1

What would I have to change to get

  1
  4

?  I presume this is covered in the Pickaxe book but can't find the
answer - a pointer to whereabouts it is covered would be great.

Sorry to be so dumb.
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