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additup by jayrye 

Shoes.app do
  stack do
    para "Please enter the first number you want to add!"
    entry_1 = edit_line :width => 20
  end
  stack do
    para "Now enter the next number"
    entry_2 = edit_line :width => 20
  end
  button "Add it up!" do
    answer = entry_1.to_i + entry_2.to_i
    alert answer
  end
end