From c481875eca2b89d752e93b995786bf6d38118c88 Mon Sep 17 00:00:00 2001
From: Yuri Tatishchev <itatishch@gmail.com>
Date: Sat, 21 Feb 2026 21:28:52 -0800
Subject: [PATCH] lab05: impl

---
 lab05/maybeEither.hs         |  25 +++++++++++++++++++++++++
 lab05/maybeEither.signed.zip | Bin 0 -> 1596 bytes
 2 files changed, 25 insertions(+)
 create mode 100644 lab05/maybeEither.hs
 create mode 100644 lab05/maybeEither.signed.zip

diff --git a/lab05/maybeEither.hs b/lab05/maybeEither.hs
new file mode 100644
index 0000000..0e9a2c2
--- /dev/null
+++ b/lab05/maybeEither.hs
@@ -0,0 +1,25 @@
+getMax :: [Int] -> Maybe Int
+getMax [] = Nothing
+getMax x = Just (maximum x)
+
+reciprocal :: (Eq a, Fractional a) => a -> Maybe a
+reciprocal 0 = Nothing
+reciprocal x = Just (1/x)
+
+rectangleArea :: Int -> Int -> Either String Int
+rectangleArea x y
+  | x < 0 = Left "Width is not positive"
+  | y < 0 = Left "Height is not positive"
+  | otherwise = Right (x * y)
+
+main :: IO ()
+main = do
+  print $ getMax []
+  print $ getMax [99,12,37]
+  print $ getMax [-99,-12,-37]
+  print $ reciprocal 4
+  print $ reciprocal 2
+  print $ reciprocal 0
+  print $ rectangleArea 5 10
+  print $ rectangleArea (-5) 10
+  print $ rectangleArea 5 (-10)
diff --git a/lab05/maybeEither.signed.zip b/lab05/maybeEither.signed.zip
new file mode 100644
index 0000000000000000000000000000000000000000..a3e2cba6cd882f53a031bded6f7b2fed4fcacc02
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