An $8-$bit A$/$D converter has an input range of $0-5$ Volts. Find the digital output $($in decimal$),$ and analog input given the digital output $($in Volts$),$ if the input is:

a$)4\mathrm{.}2V$

b$)-1\mathrm{.}76V$

c$)3\mathrm{.}1415V$

d$)5\mathrm{.}125V$