perl -e "print q/2e+11/, $/; print 2e+11, $/;"

##</code><code>##

perl -e "print q/2e+11/ + 0, $/;"

##</code><code>##

my @numbers;
while( my $num = <DATA> ) {
    chomp $num;
    push @numbers, $num + 0;
}
print "$_\n" for sort { $a <=> $b } @numbers;
__DATA__
1e-13
2e-18
1e-11