Created
October 14, 2009 03:01
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| module Mainbak01 where | |
| import Stack | |
| comb :: (Stack a -> (a, Stack a)) | |
| -> (a -> (Stack a -> (a, Stack a))) | |
| -> Stack a -> (a, Stack a) | |
| comb m n = \stack0 -> | |
| let (x1, stack1) = m stack0 | |
| (x2, stack2) = n x1 stack1 | |
| in (x2, stack2) | |
| ret :: a -> (Stack a -> (a, Stack a)) | |
| ret x = \stack -> (x, stack) | |
| comb_ :: (Stack a -> (a, Stack a)) | |
| -> (Stack a -> (a, Stack a)) | |
| -> Stack a -> (a, Stack a) | |
| comb_ m n = m `comb` (\_ -> n) | |
| main = do | |
| print $ pop `comb` (\x1 -> pop) $ s | |
| print $ pop `comb` (\x1 -> pop `comb` \x2 -> ret(x1 + x2)) $ s | |
| print $ pop `comb` (\x1 -> | |
| pop `comb` \x2 -> | |
| pop `comb` \x3 -> | |
| ret $ (x1 + x3) * x2) $ s |
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