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這裏是我的代碼:大小的樹,而不是在範圍
data Binary_Tree a = Null
|Node {element :: a, left_tree, right_tree :: Binary_Tree a}
deriving (Show, Eq)
--depth_of_tree
dot :: Integral b => Binary_Tree a -> b
dot Null = 0
dot Node (a left right) = 1 + (dot Node (a left right)) + (dot Node (a left right))
然而,當我加載它在ghci中它,並輸入
dot Node (2 (Node 3 Null Null) Null)
它出來一個錯誤:
<interactive>:13:1:
Not in scope: `dot'
Perhaps you meant `not' (imported from Prelude)
任何人都喜歡告訴我我的代碼有什麼問題嗎?
感謝任何人誰可以很好我一些建議XD