#! /usr/bin/perl -w

use strict;

while( <DATA> ) {
    chomp;

    my $nr = squeeze($_);
    print "[$nr] $_\n";
}

sub squeeze {
  my $n = sprintf( '%0.8f', $_[0] );
  $n =~ s/^0//;
  substr( $n, 0, 8 );
}

__DATA__
12345678901234567890
1234567890
1234567.0
1234567.9
123456.789012345
12345
123.4567
123.4
.1
.1234567890
0.00000999999