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#!/usr/bin/perl -w use strict; use Getopt::Std; sub conv { my ($val, $fac) = @_; ref $fac ? $fac->[0]->($val) : $val * $fac; } sub reverse_conv { my ($val, $fac) = @_; ref $fac ? $fac->[1]->($val) : $val / $fac; } use constant SRC => 0; use constant DST => 1; use constant FAC => 2; my @table = ( #### temperature [ c => f => [ sub { ($_[0] * 9/5) + 32 }, sub { ($_[0] - 32) * 5/9 }, ]], [ c => k => [ sub { $_[0] + 273.16 }, sub { $_[0] - 273.16 }, ]], #### mass/weight [ kg => g => 1000 ], [ floz => g => 30 ], [ lbs => kg => 0.4536 ], #### distance [ ft => m => 0.3048 ], [ ft => in => 12 ], [ in => cm => 2.54 ], [ m => cm => 100 ], [ yd => m => 0.9144 ], [ km => m => 1000 ], [ mile => km => 1.609347 ], ); my @unit = sort keys %{{ map +($_->[SRC] => 1, $_->[DST] => 1), @table }}; die << "END_USAGE" unless getopts('ap:', \my %opt) and @ARGV and (0 == + @ARGV % 2); usage: unitconv [-a] [-p precision] <val> <unit> [<val> <unit> [..]] -p the number of decimal places [default: 2] -a force all possible conversions to be shown, even if insufficient display precision truncates the value to 0 <unit> can be one of: @unit Results will be printed on one line per input val/unit pair. END_USAGE my $prec = $opt{p} || 2; while(@ARGV) { my (%val, $keys_before) = reverse splice @ARGV, 0, 2; do { $keys_before = keys %val; for(@table) { $val{$_->[DST]} = conv($val{$_->[SRC]}, $_->[FAC]) if exists $val{$_->[SRC]} and not exists $val{$_->[DST]}; $val{$_->[SRC]} = reverse_conv($val{$_->[DST]}, $_->[FAC]) if exists $val{$_->[DST]} and not exists $val{$_->[SRC]}; } } until ($keys_before == keys %val); unless($opt{a}) { sprintf("%.*f", $prec, $val{$_}) == 0 and delete $val{$_} for keys %val; } printf "% 8.${prec}f %s " x keys(%val) . "\n", map +($val{$_} => $_), sort keys %val; }

In reply to The Definitive Unit Conversion Script by Aristotle

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