Signed numbers and addition:

$($a$)$ You have a signed two's bit complement number that is $4$ bits wide named $A.$ The bits

are A$3,$ A$2,$ A$1,$ A$0($where A$0$ is the LSB$).$ Draw a schematic of hardware that would

negate this value $($e$.$g$.3$ goes to $-3,-5$ goes to $5).$

$($b$)$ Now complete the schematic of a $4-$bit full adder$/$subtractor and show that $5+-5=0.$

Write the bit result for all connections in the adder.