My version actually started out in my head closer to: 

my $mask= 0x0f000007;
my $val= 0;
do {
    printf "0x%08.8x\n", $val & $mask;
    $val |= ~$mask;
    ++$val;
} while( $val <= ~0 );

[download]

but in typing it I decided to simplify. (:

- tye        

In reply to Re^2: Incrementing only the masked bits (chicken eggs) by tye
in thread Incrementing only the masked bits by lyeoh

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