Convert following decimal numbers to binary number, octal number, BCD code and Gray code

respectively.

$1)255$

$2)26$

$3)1023$

$4)0\mathrm{.}828125$

$5)0\mathrm{.}256($Accuracy$=0\mathrm{.}1\%)$

$6)11\mathrm{.}274($Accuracy $=1\%$