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slimane/ack.hs

Last active January 2, 2016 02:39
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ack.hs
ack :: (Integer, Integer) -> Integer
ack (0, n) = n + 1
ack (m, 0) = ack(m - 1, 1)
ack (m, n) = ack(m -1, ack(m, n-1))
ackGuard :: (Integer, Integer) -> Integer
ackGuard (m, n)
| m == 0 = n + 1
| n == 0 = ackGuard(m - 1, 1)
| otherwise = ackGuard(m -1, ackGuard(m, n-1))
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