RosettaCodeData/Task/Ackermann-function/True-BASIC/ackermann-function.basic

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FUNCTION ack(m, n)
IF m = 0 THEN LET ack = n+1
IF m > 0 AND n = 0 THEN LET ack = ack(m-1, 1)
IF m > 0 AND n > 0 THEN LET ack = ack(m-1, ack(m, n-1))
END FUNCTION
FOR m = 0 TO 4
PRINT USING "###": m;
FOR n = 0 TO 8
! A(4, 1) OR higher will RUN OUT of stack memory (default 1M)
! change n = 1 TO n = 2 TO calculate A(4, 2), increase stack!
IF m = 4 AND n = 1 THEN EXIT FOR
PRINT USING "######": ack(m, n);
NEXT n
PRINT
NEXT m
END