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24 lines
496 B
Perl
24 lines
496 B
Perl
#!/usr/bin/perl
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use warnings;
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use strict;
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sub fibonacci3 {
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my ($count, $aref) = @_;
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unless ($aref) {
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# first call - initialize
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$aref = [1,1];
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$count -= scalar(@{$aref});
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}
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if ($count--) {
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my $next = $aref->[-1] + $aref->[-2];
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push @{$aref}, $next;
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@_ = ($count, $aref);
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goto &fibonacci3;
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} else {
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return wantarray?@{$aref}:$aref->[-1];
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}
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}
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print scalar(fibonacci3(1000)), "\n"; |