Create an $8-$bit adder using the Verilog addition operator $("+").$ Connect the adder$$s inputs to two $8-$bit registers that can each be individually loaded from $8$ slide switches by pressing a corresponding pushbutton $($see code below$).$ Connect the adder$$s output to two digits of the seven$-$segment display. Since the inputs are $8-$bit binary numbers, you should use a seven$-$segment controller than can generate hex digits as well as BCD digits.

reg $[7$:$0]$ op$1,$ op$2$; always @ $($posedge$($clk$))$ begin if $($btn$[0])$ op sw; if $($btn$[1])$ op sw; end

Configure the adder to be an adder$/$subtractor by including a circuit that can change one of the operand inputs into its negated two$$s$-$compliment form $($i$.$e$.,$ invert all the bits and add one$).$ Use a pushbutton to select between addition and subtraction.