Slightly more Perlish way to do things: 
use strict;
use warnings;

my $cnt = 0;
for my $v (0 .. 127) {
    if ($v < 64) {
        $cnt++;
    }
    else {
        my $bin   = sprintf '%08b', $v;
        my @pairs = $bin =~ /\d\d/g;
        $cnt++ if (grep {$_ eq '00'} @pairs);
    }
}
print "$cnt\n";

__END__
101

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Update: The grep performs the logical "or" check of your 4 bit pairs (to "00"). I changed your sprintf format spec to always print exactly 8 characters.

In reply to Re: binary string by toolic
in thread binary string by alih110

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