#!/usr/bin/perl -w
use strict;

sub hanoi {
   my ($n, $start, $end, $extra) = @_;
   if ($n == 1) {
       print "HELLLLLOOOOOOOOOOOOO Move disk #1 from $start to $end.\n";
   } else {
        hanoi($n-1, $start, $extra, $end);
        print "Move disk #$n from $start to $end.\n";
        hanoi($n-1, $extra, $end, $start);
   }
}

hanoi(3, 'A', 'C', 'B');



./perl.hanoi1
HELLLLLOOOOOOOOOOOOO Move disk #1 from A to C.
Move disk #2 from A to B.
HELLLLLOOOOOOOOOOOOO Move disk #1 from C to B.
Move disk #3 from A to C.
HELLLLLOOOOOOOOOOOOO Move disk #1 from B to A.
Move disk #2 from B to C.
HELLLLLOOOOOOOOOOOOO Move disk #1 from A to C.




  DB<2>
main::hanoi(perl.hanoi1:7):        if ($n == 1) {
                                                                                                                                     DB<2> x $n
0  1
                                                                                                                                     DB<3> s
main::hanoi(perl.hanoi1:8):            print "HELLLLLOOOOOOOOOOOOO Move disk #1 from $start to $end.\n";
                                                                                                                                     DB<3> s
HELLLLLOOOOOOOOOOOOO Move disk #1 from A to C.
main::hanoi(perl.hanoi1:11):            print "Move disk #$n from $start to $end.\n";
                                                                                                                                     DB<3> s
Move disk #2 from A to B.
main::hanoi(perl.hanoi1:12):            hanoi($n-1, $extra, $end, $start);
                                                                                                                                     DB<3> x $n
0  2
                                                                                                                                     DB<4> s
main::hanoi(perl.hanoi1:6):        my ($n, $start, $end, $extra) = @_;
                                                                                                                                     DB<4> x $n
0  undef
                                                                                                                                     DB<5> s
main::hanoi(perl.hanoi1:7):        if ($n == 1) {
                                                                                                                                     DB<5> x $n
0  1
                                                                                                                                     DB<6> s
main::hanoi(perl.hanoi1:8):            print "HELLLLLOOOOOOOOOOOOO Move disk #1 from $start to $end.\n";
                                                                                                                                     DB<6> s
HELLLLLOOOOOOOOOOOOO Move disk #1 from C to B.
main::hanoi(perl.hanoi1:11):            print "Move disk #$n from $start to $end.\n";
                                                                                                                                     DB<6> x $n
0  3