diff options
Diffstat (limited to 'week3/camil')
| -rw-r--r-- | week3/camil/.gitignore | 1 | ||||
| -rw-r--r-- | week3/camil/StdStack.icl | 38 |
2 files changed, 37 insertions, 2 deletions
diff --git a/week3/camil/.gitignore b/week3/camil/.gitignore index 3d25840..341d5f8 100644 --- a/week3/camil/.gitignore +++ b/week3/camil/.gitignore @@ -1 +1,2 @@ /Clean System Files/ +StdStack diff --git a/week3/camil/StdStack.icl b/week3/camil/StdStack.icl index 25ff265..dd51a94 100644 --- a/week3/camil/StdStack.icl +++ b/week3/camil/StdStack.icl @@ -1,6 +1,7 @@ implementation module StdStack
import StdEnv
+import StdList
:: Stack a :== [a]
@@ -8,9 +9,34 @@ newStack :: (Stack a) newStack = []
push :: a (Stack a) -> (Stack a)
-push a s = s ++ [a]
+push a s = [a] ++ s
-pop
+pop :: (Stack a) -> (Stack a)
+pop [a:s] = s
+pop [] = []
+
+popn :: Int (Stack a) -> (Stack a)
+popn 0 s = s
+popn n s = popn (n-1) (pop s)
+
+pushes :: [a] (Stack a) -> (Stack a)
+pushes [] s = s
+pushes a s = pushes (tl a) (push (hd a) s)
+
+top :: (Stack a) -> a
+top [] = abort "`top s` with s = []"
+top s = hd s
+
+topn :: Int (Stack a) -> [a]
+topn n s
+ | n > length s = abort "`topn n s` with n > length s"
+ | otherwise = take n s
+
+count :: (Stack a) -> Int
+count s = length s
+
+elements :: (Stack a) -> [a]
+elements s = s
Start = ( "s0 = newStack = ", s0,'\n'
, "s1 = push 1 s0 = ", s1,'\n'
@@ -20,6 +46,10 @@ Start = ( "s0 = newStack = ", s0,'\n' , "s5 = top s4 = ", s5,'\n'
, "s6 = topn 3 s2 = ", s6,'\n'
, "s7 = elements s2 = ", s7,'\n'
+// , "s8 = push 10 s1 = ", s8,'\n'
+// , "s9 = popn 10 s8 = ", s9,'\n'
+// , "sa = topn 5 s4 = ", sa,'\n'
+// , "sb = top s0 = ", sb,'\n'
)
where
s0 = newStack
@@ -30,3 +60,7 @@ where s5 = top s4
s6 = topn 3 s2
s7 = elements s2
+// s8 = push 10 s1
+// s9 = popn 10 s8
+// sa = topn 5 s4
+// sb = top s0
|