Add remaining haskell book exercises

7 files changed, 163 insertions, 0 deletions

diff --git a/Haskell-book/14/addition/Addition.hs b/Haskell-book/14/addition/Addition.hs
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+module Addition where
+
+import Test.Hspec
+import Test.QuickCheck
+
+dividedBy :: Integral a => a -> a -> (a, a)
+dividedBy num denom = go num denom 0
+    where go n d count
+            | n < d = (count, n)
+            | otherwise =  go (n - d) d (count + 1)
+
+multiplyBy :: (Ord a, Eq a, Num a) => a -> a -> a
+multiplyBy a b
+    | a == 0 || b == 0 = 0
+    | a > 0 && b > 0   = multiplyBy' a b
+    | a < 0 && b < 0   = multiplyBy' (-a) (-b)
+    | a < 0 && b > 0   = -(multiplyBy' (-a) b)
+    | a > 0 && b < 0   = -(multiplyBy' a (-b))
+    where  multiplyBy' c 1 = c
+           multiplyBy' c d = c + (multiplyBy c (d - 1))
+
+main :: IO ()
+main = hspec $ do
+    describe "Addition" $ do
+        it "15 divided by 3 is 5" $ do
+            dividedBy 15 3 `shouldBe` (5, 0)
+        it "22 divided by 5 is 4 remainder 2" $ do
+            dividedBy 22 5 `shouldBe` (4, 2)
+        it "x + 1 is always greater than x" $ do
+            property $ \x -> x + 1 > (x :: Int)
+    describe "Multiplication" $ do
+        it "15 multiplied by 3 is 45" $ do
+            multiplyBy 15 3 `shouldBe` 45
+        it "22 multiplied by 5 is 110" $ do
+            multiplyBy 22 5 `shouldBe` 110
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diff --git a/Haskell-book/14/addition/LICENSE b/Haskell-book/14/addition/LICENSE
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+Copyright Author name here (c) 2017
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of Author name here nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
\ No newline at end of file
diff --git a/Haskell-book/14/addition/README.md b/Haskell-book/14/addition/README.md
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+++ b/Haskell-book/14/addition/README.md
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+# addition
diff --git a/Haskell-book/14/addition/Setup.hs b/Haskell-book/14/addition/Setup.hs
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+++ b/Haskell-book/14/addition/Setup.hs
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+import Distribution.Simple
+main = defaultMain
diff --git a/Haskell-book/14/addition/addition.cabal b/Haskell-book/14/addition/addition.cabal
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+++ b/Haskell-book/14/addition/addition.cabal
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+name:                addition
+version:             0.1.0.0
+license-file:        LICENSE
+author:              Chicken Little
+maintainer:          sky@isfalling.org
+category:            Text
+build-type:          Simple
+cabal-version:       >=1.10
+
+library
+  exposed-modules:     Addition
+  ghc-options:         -Wall -fwarn-tabs
+  build-depends:       base >= 4.7 && < 5
+                     , hspec
+                     , QuickCheck
+  hs-source-dirs:      .
+  default-language:    Haskell2010
diff --git a/Haskell-book/14/addition/stack.yaml b/Haskell-book/14/addition/stack.yaml
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+++ b/Haskell-book/14/addition/stack.yaml
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+# This file was automatically generated by 'stack init'
+#
+# Some commonly used options have been documented as comments in this file.
+# For advanced use and comprehensive documentation of the format, please see:
+# https://docs.haskellstack.org/en/stable/yaml_configuration/
+
+# Resolver to choose a 'specific' stackage snapshot or a compiler version.
+# A snapshot resolver dictates the compiler version and the set of packages
+# to be used for project dependencies. For example:
+#
+# resolver: lts-3.5
+# resolver: nightly-2015-09-21
+# resolver: ghc-7.10.2
+# resolver: ghcjs-0.1.0_ghc-7.10.2
+# resolver:
+#  name: custom-snapshot
+#  location: "./custom-snapshot.yaml"
+resolver: lts-9.14
+
+# User packages to be built.
+# Various formats can be used as shown in the example below.
+#
+# packages:
+# - some-directory
+# - https://example.com/foo/bar/baz-0.0.2.tar.gz
+# - location:
+#    git: https://github.com/commercialhaskell/stack.git
+#    commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+# - location: https://github.com/commercialhaskell/stack/commit/e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+#   extra-dep: true
+#  subdirs:
+#  - auto-update
+#  - wai
+#
+# A package marked 'extra-dep: true' will only be built if demanded by a
+# non-dependency (i.e. a user package), and its test suites and benchmarks
+# will not be run. This is useful for tweaking upstream packages.
+packages:
+- .
+# Dependency packages to be pulled from upstream that are not in the resolver
+# (e.g., acme-missiles-0.3)
+extra-deps: []
+
+# Override default flag values for local packages and extra-deps
+flags: {}
+
+# Extra package databases containing global packages
+extra-package-dbs: []
+
+# Control whether we use the GHC we find on the path
+# system-ghc: true
+#
+# Require a specific version of stack, using version ranges
+# require-stack-version: -any # Default
+# require-stack-version: ">=1.5"
+#
+# Override the architecture used by stack, especially useful on Windows
+# arch: i386
+# arch: x86_64
+#
+# Extra directories used by stack for building
+# extra-include-dirs: [/path/to/dir]
+# extra-lib-dirs: [/path/to/dir]
+#
+# Allow a newer minor version of GHC than the snapshot specifies
+# compiler-check: newer-minor
\ No newline at end of file
diff --git a/Haskell-book/14/addition/stack.yaml.lock b/Haskell-book/14/addition/stack.yaml.lock
new file mode 100644
index 0000000..75bf3ab
--- /dev/null
+++ b/Haskell-book/14/addition/stack.yaml.lock
@@ -0,0 +1,12 @@
+# This file was autogenerated by Stack.
+# You should not edit this file by hand.
+# For more information, please see the documentation at:
+#   https://docs.haskellstack.org/en/stable/topics/lock_files
+
+packages: []
+snapshots:
+- completed:
+    sha256: 9e880f85f76b7f35a2b6edd1af333ce7f7845d47e897c3509ddd18eaa2763779
+    size: 536352
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/9/14.yaml
+  original: lts-9.14