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Bugzilla – Attachment 312 Details for
Bug 9203
Compare/diff performance is bad
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aaa
postfix.hs (text/plain), 542 bytes, created by
Edward Lam
on 2002-02-06 15:25:41 EST
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Description:
aaa
Filename:
MIME Type:
Creator:
Edward Lam
Created:
2002-02-06 15:25:41 EST
Size:
542 bytes
patch
obsolete
>import Stack > >postfix :: String -> Float >postfix s = parse s stack where stack = newStack > >parse :: String -> Stack Float -> Float >parse [] stack = fst (pop stack) >parse (ch:s) stack > | ('0' <= ch) && (ch <= '9') = parse s (push x stack) > | otherwise = parse s (push n s2) > where x = fromInt (ord ch - ord '0') > (n1, s1) = pop stack > (n2, s2) = pop s1 > n = eval ch n1 n2 > >eval :: Char -> Float -> Float -> Float >eval ch n1 n2 > | ch == '+' = n2 + n1 > | ch == '-' = n2 - n1 > | ch == '*' = n2 * n1 > | ch == '/' = n2 / n1
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