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  1. or download this
            
    P:\test\MJD>ack1 9
    Ack(3,9): 4093
    78.843 83.671 0 0
  2. or download this
    P:\test\MJD>timethis "c:javac ackermann.java && java ackermann 9"

...
TimeThis :    Start Time :  Fri Sep 02 22:01:28 2005
TimeThis :      End Time :  Fri Sep 02 22:01:29 2005
TimeThis :  Elapsed Time :  00:00:01.031
  3. or download this
    use Memoize;
memoize("Ack");
...
print "Ack(3,$NUM): $ack";
#print times;
print "Ack() called $count times";
  4. or download this
    P:\test\MJD>ack1 9
Ack(3,9): 4093
...
Ack(3,9): 4093
0.046000
Ack() called 12,294 times