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my $nz= -0.0;
printf "%f\n", $nz;    # Will print "-0.00000" on some platforms
printf "%f\n", "$nz";  # Should give "0.00000"

-0.000000
-0.000000

#!/usr/bin/perl -w
use strict;
...
-0.000000
-0.000000
0.000000