I have an $8-$bit quantity, $x_7{x}_6{x}_5{x}_4{x}_3{x}_2{x}_1{x}_0.$

The most significant bit is $x_7,$ the least significant bit is $x_0.$

In $C,$ if I want to set $x_6$ and $x_5$ to be one, but keep all other bits unchanged, I would

$($use one of &$,|,{?}^{{?}^{?}})$ the quantity with a mask of

$($show me

the $8$ bits you will use$).$

if I want to reset $x_4$ and $x_3$ to be zero, but keep all other bits unchanged, I would

$($use one of &$,|,{?}^{{?}^{?}})$ the quantity with a mask of

$($show me

the $8$ bits you will use$).$

if I want to toggle $x_1$ and $x_0,$ but keep all other bits unchanged, I would

$($use

one of &$,|,{?}^{{?}^{?}})$ the quantity with a mask of

$($show me the $8$ bits you will use$).$