Ackermann Function
ack: N * N -> N
ack(0, n) = n + 1
ack(m, 0) = ack(m - 1, 1)
ack(m, n) = ack(m - 1, ack(m, n - 1))
$ ghci ackermann.hs
*Main> ack 1 1
3
$ irb
irb(main):001:0> load './ackermann.rb'
=> true
irb(main):002:0> ack(1, 1)
=> 3
compile
$ gcc ackermann.c
execution
$ ./a.out
m = 1
n = 1
ack(1, 1) = 3
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