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// Ackermann function
`export ack : Fn[m; n] $ (
t : `type m;
? |(t != `type n; t != Int[Any; Any; Any]) {
`panic "m and n must be the same type of Int"
}
? t = Int[Any; .signed; Any] {
? |(m < 0; n < 0) { `return 0 }
}
? {
m = 0 { n + 1 }
&(m > 0; n = 0) { ack `sync (m - 1; 1) }
&(m > 0; n > 0) { ack `sync (m - 1; ack `sync (m; n - 1)) }
{ 0 }
}
)
`export ack_string : Fn[m; n] $ (
String $ ("ack("; m; " "; n; ") = "; ack `sync (m; n); "\n")
)
`is_main Fn $ (
( args ) : `use "sys"
? 4 != `length args {
`return `error String $ (
"Got: "; " " `join args; "\n"
"Usage: "; args `get 0; " "; args `get 1; " <m> <n>\n"
)
}
`print ack_string `sync (I64 $ args `get -2; I64 $ args `get -1)
)
|
