e we may have Empty tree, we need to implement minTree with Maybe typ ree :: BTree Int -> Maybe Int. Using exceptions will be more challeng laskell since exceptions are captured via Monad class. Tree a

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Consider a polymorphic binary tree type.
Write a function that will return the smallest value in the tree. You may use
the 'min' function.
Since we may have Empty tree, we need to implement minTree with Maybe type, namely
minTree :: BTree Int -> Maybe Int. Using exceptions will be more challenging
in Haskell since exceptions are captured via Monad class.
-}
data BTree a
= Empty
| Leaf a
| Node a (BTree a) (BTree a)
tree1 :: BTree Int
tree1 = Leaf 3
tree2 :: BTree Int
tree2 = Node 4 tree1 tree1
tree3 :: BTree Int
tree3 = Node 6 tree2 tree1
minTree :: BTree Int -> Maybe Int
Transcribed Image Text:Consider a polymorphic binary tree type. Write a function that will return the smallest value in the tree. You may use the 'min' function. Since we may have Empty tree, we need to implement minTree with Maybe type, namely minTree :: BTree Int -> Maybe Int. Using exceptions will be more challenging in Haskell since exceptions are captured via Monad class. -} data BTree a = Empty | Leaf a | Node a (BTree a) (BTree a) tree1 :: BTree Int tree1 = Leaf 3 tree2 :: BTree Int tree2 = Node 4 tree1 tree1 tree3 :: BTree Int tree3 = Node 6 tree2 tree1 minTree :: BTree Int -> Maybe Int
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