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Re^3: cannot follow hanoi subroutine

by Anonymous Monk
on Nov 05, 2007 at 09:10 UTC ( [id://648976]=note: print w/replies, xml ) Need Help??


in reply to Re^2: cannot follow hanoi subroutine
in thread cannot follow hanoi subroutine

Its because you're not really following :)
#!/usr/bin/perl -w use strict; sub hanoi { warn "invoked @_"; my ($n, $start, $end, $extra) = @_; if ($n == 1) { warn "Move disk #1 from $start to $end."; } else { hanoi($n-1, $start, $extra, $end); warn "Move disk #$n from $start to $end."; hanoi($n-1, $extra, $end, $start); } } hanoi(3, 'A', 'C', 'B'); __END__ invoked 3 A C B at hanoisub.pl line 5. invoked 2 A B C at hanoisub.pl line 5. invoked 1 A C B at hanoisub.pl line 5. Move disk #1 from A to C. at hanoisub.pl line 8. Move disk #2 from A to B. at hanoisub.pl line 11. invoked 1 C B A at hanoisub.pl line 5. Move disk #1 from C to B. at hanoisub.pl line 8. Move disk #3 from A to C. at hanoisub.pl line 11. invoked 2 B C A at hanoisub.pl line 5. invoked 1 B A C at hanoisub.pl line 5. Move disk #1 from B to A. at hanoisub.pl line 8. Move disk #2 from B to C. at hanoisub.pl line 11. invoked 1 A C B at hanoisub.pl line 5. Move disk #1 from A to C. at hanoisub.pl line 8.
get it now?

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