Doubled the speed of the implementation: #! perl -slw
use strict;
use Time::HiRes qw[ time ];
my @c1 = (' ', '0'..'9', 'A'..'Z' );
sub fromB37 {
my $n = shift;
my $s = ' ';
substr( $s, $_, 1, $c1[ $n%37 ] ), $n /= 37 for 0 .. 5;
$s;
}
my @c2;
$c2[ ord( $c1[ $_ ] ) ] = $_ for 0 .. 36;
sub toB37 {
my $n = 0;
$n = $n * 37 + $c2[$_] for reverse unpack 'C*', $_[0];
$n;
}
my $start = time;
for ( 1 .. 1e6 ) {
my $s = fromB37( rand 37**6 );
}
printf "fromB37 took %.3f seconds/million\n", time() - $start;
$start = time;
for ( 'AAAAA' .. 'CEXHN' ) {
my $n = toB37( $_ );
}
printf "toB37 took %.3f second/million\n", time() - $start;
my @data = map int( rand 37**6 ), 1 .. 1e6;
$start = time;
$_ == toB37( fromB37( $_ ) ) or die $_ for @data;
printf "Both ways took %.3f second/million\n", time() - $start;
__END__
C:\test>junk45
fromB37 took 5.309 seconds/million
toB37 took 3.234 second/million
Both ways took 8.953 second/million
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
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