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  1. or download this
    dec(998)  == 998
dec(999)  == 999
dec(1000) ==   8
dec(1001) ==   9
dec(1002) == 514
  2. or download this
    # changebase($number, $from[, $to]);

...
# 255
print changebase('FF', 16, 2);
# 11111111
  3. or download this
    use Base;
$hex = new Base 16 => 'FF';
...
# 11111111
print $hex;
# 11111111