# LAB 8
## NAME AMAN ANAND
## ROLL NUMBER CS22B054
## QUESTION 1
`code`
module Fulladder_using_halfadder(a,b,cin,cout,s);
input a,b,cin;
output cout,s;
wire w1,w2,w3;
half_adder p(a,b,w1,w2);
half_adder q(cin,w1,s,w3);
or r(cout,w3,w2);
endmodule
module half_adder (a,b,sum,carry);
input a, b;
output sum, carry;
assign sum = a ^ b;
assign carry = a & b;
endmodule
### testbench
module Fulladder_using_halfadder_TB();
reg a,b,cin;
wire cout,s;
Fulladder_using_halfadder f(.a(a),.b(b),.cin(cin),.cout(cout),.s(s));
initial
begin
a=0;b=0;cin=0;
#100 a=0;b=0;cin=1;
#100 a=0;b=1;cin=0;
#100 a=0;b=1;cin=1;
#100 a=1;b=0;cin=0;
#100 a=1;b=0;cin=1;
#100 a=1;b=1;cin=0;
#100 a=1;b=1;cin=1;
end
endmodule
## QUESTION 2
`code`
module Four_bit_ripple_adder(A,B,Cin,SUM,Cout);
input [3:0]A;
input [3:0]B;
wire [2:0]Carry;
output [3:0]SUM;
output Cout;
input Cin;
Full_adder a(A[0],B[0],Cin,Carry[0],SUM[0]);
Full_adder b(A[1],B[1],Carry[0],Carry[1],SUM[1]);
Full_adder c(A[2],B[2],Carry[1],Carry[2],SUM[2]);
Full_adder d(A[3],B[3],Carry[2],Cout,SUM[3]);
endmodule
module Full_adder(a,b,cin,cout,s);
input a,b,cin;
output cout,s;
wire w1,w2,w3;
half_adder p(a,b,w1,w2);
half_adder q(cin,w1,s,w3);
or r(cout,w3,w2);
endmodule
module half_adder (a,b,sum,carry);
input a, b;
output sum, carry;
assign sum = a ^ b;
assign carry = a & b;
endmodule
### testbench
module Ripple_Carry_adder_tb();
reg [3:0] A;
reg [3:0] B;
wire [3:0]SUM;
wire Cout;
Ripple_Carry_adder rca(.A(A),.B(B),.Cin(Cin),.SUM(SUM),.Cout(Cout));
initial begin
A = 4'b0000; B = 4'b0000;Cin=0; #10
A = 4'b0000; B = 4'b0001;Cin=0; #10
A = 4'b0000; B = 4'b0010;Cin=0; #10
A = 4'b0000; B = 4'b0011;Cin=0; #10
A = 4'b0000; B = 4'b0100;Cin=0; #10
A = 4'b0000; B = 4'b0101;Cin=0; #10
A = 4'b0000; B = 4'b0110;Cin=0; #10
A = 4'b0000; B = 4'b0111;Cin=0; #10
A = 4'b0000; B = 4'b1000;Cin=0; #10
A = 4'b0000; B = 4'b1001;Cin=0; #10
A = 4'b0000; B = 4'b1010;Cin=0; #10
A = 4'b0000; B = 4'b1011;Cin=0; #10
A = 4'b0000; B = 4'b1100;Cin=0; #10
A = 4'b0000; B = 4'b1101;Cin=0; #10
A = 4'b0000; B = 4'b1110;Cin=0; #10
A = 4'b0000; B = 4'b1111;Cin=0; #10
A = 4'b0001; B = 4'b0000;Cin=0; #10
A = 4'b0001; B = 4'b0001;Cin=0; #10
A = 4'b0001; B = 4'b0010;Cin=0; #10
A = 4'b0001; B = 4'b0011;Cin=0; #10
A = 4'b0001; B = 4'b0100;Cin=0; #10
A = 4'b0001; B = 4'b0101;Cin=0; #10
A = 4'b0001; B = 4'b0110;Cin=0; #10
A = 4'b0001; B = 4'b0111;Cin=0; #10
A = 4'b0001; B = 4'b1000;Cin=0; #10
A = 4'b0001; B = 4'b1001;Cin=0; #10
A = 4'b0001; B = 4'b1010;Cin=0; #10
A = 4'b0001; B = 4'b1011;Cin=0; #10
A = 4'b0001; B = 4'b1100;Cin=0; #10
A = 4'b0001; B = 4'b1101;Cin=0; #10
A = 4'b0001; B = 4'b1110;Cin=0; #10
A = 4'b0001; B = 4'b1111;Cin=0; #10
A = 4'b0010; B = 4'b0000;Cin=0; #10
A = 4'b0010; B = 4'b0001;Cin=0; #10
A = 4'b0010; B = 4'b0010;Cin=0; #10
A = 4'b0010; B = 4'b0011;Cin=0; #10
A = 4'b0010; B = 4'b0100;Cin=0; #10
A = 4'b0010; B = 4'b0101;Cin=0; #10
A = 4'b0010; B = 4'b0110;Cin=0; #10
A = 4'b0010; B = 4'b0111;Cin=0; #10
A = 4'b0010; B = 4'b1000;Cin=0; #10
A = 4'b0010; B = 4'b1001;Cin=0; #10
A = 4'b0010; B = 4'b1010;Cin=0; #10
A = 4'b0010; B = 4'b1011;Cin=0; #10
A = 4'b0010; B = 4'b1100;Cin=0; #10
A = 4'b0010; B = 4'b1101;Cin=0; #10
A = 4'b0010; B = 4'b1110;Cin=0; #10
A = 4'b0010; B = 4'b1111;Cin=0; #10
A = 4'b0011; B = 4'b0000;Cin=0; #10
A = 4'b0011; B = 4'b0001;Cin=0; #10
A = 4'b0011; B = 4'b0010;Cin=0; #10
A = 4'b0011; B = 4'b0011;Cin=0; #10
A = 4'b0011; B = 4'b0100;Cin=0; #10
A = 4'b0011; B = 4'b0101;Cin=0; #10
A = 4'b0011; B = 4'b0110;Cin=0; #10
A = 4'b0011; B = 4'b0111;Cin=0; #10
A = 4'b0011; B = 4'b1000;Cin=0; #10
A = 4'b0011; B = 4'b1001;Cin=0; #10
A = 4'b0011; B = 4'b1010;Cin=0; #10
A = 4'b0011; B = 4'b1011;Cin=0; #10
A = 4'b0011; B = 4'b1100;Cin=0; #10
A = 4'b0011; B = 4'b1101;Cin=0; #10
A = 4'b0011; B = 4'b1110;Cin=0; #10
A = 4'b0011; B = 4'b1111;Cin=0; #10
A = 4'b0100; B = 4'b0000;Cin=0; #10
A = 4'b0100; B = 4'b0001;Cin=0; #10
A = 4'b0100; B = 4'b0010;Cin=0; #10
A = 4'b0100; B = 4'b0011;Cin=0; #10
A = 4'b0100; B = 4'b0100;Cin=0; #10
A = 4'b0100; B = 4'b0101;Cin=0; #10
A = 4'b0100; B = 4'b0110;Cin=0; #10
A = 4'b0100; B = 4'b0111;Cin=0; #10
A = 4'b0100; B = 4'b1000;Cin=0; #10
A = 4'b0100; B = 4'b1001;Cin=0; #10
A = 4'b0100; B = 4'b1010;Cin=0; #10
A = 4'b0100; B = 4'b1011;Cin=0; #10
A = 4'b0100; B = 4'b1100;Cin=0; #10
A = 4'b0100; B = 4'b1101;Cin=0; #10
A = 4'b0100; B = 4'b1110;Cin=0; #10
A = 4'b0100; B = 4'b1111;Cin=0; #10
A = 4'b0101; B = 4'b0000;Cin=0; #10
A = 4'b0101; B = 4'b0001;Cin=0; #10
A = 4'b0101; B = 4'b0010;Cin=0; #10
A = 4'b0101; B = 4'b0011;Cin=0; #10
A = 4'b0101; B = 4'b0100;Cin=0; #10
A = 4'b0101; B = 4'b0101;Cin=0; #10
A = 4'b0101; B = 4'b0110;Cin=0; #10
A = 4'b0101; B = 4'b0111;Cin=0; #10
A = 4'b0101; B = 4'b1000;Cin=0; #10
A = 4'b0101; B = 4'b1001;Cin=0; #10
A = 4'b0101; B = 4'b1010;Cin=0; #10
A = 4'b0101; B = 4'b1011;Cin=0; #10
A = 4'b0101; B = 4'b1100;Cin=0; #10
A = 4'b0101; B = 4'b1101;Cin=0; #10
A = 4'b0101; B = 4'b1110;Cin=0; #10
A = 4'b0101; B = 4'b1111;Cin=0; #10
A = 4'b0110; B = 4'b0000;Cin=0; #10
A = 4'b0110; B = 4'b0001;Cin=0; #10
A = 4'b0110; B = 4'b0010;Cin=0; #10
A = 4'b0110; B = 4'b0011;Cin=0; #10
A = 4'b0110; B = 4'b0100;Cin=0; #10
A = 4'b0110; B = 4'b0101;Cin=0; #10
A = 4'b0110; B = 4'b0110;Cin=0; #10
A = 4'b0110; B = 4'b0111;Cin=0; #10
A = 4'b0110; B = 4'b1000;Cin=0; #10
A = 4'b0110; B = 4'b1001;Cin=0; #10
A = 4'b0110; B = 4'b1010;Cin=0; #10
A = 4'b0110; B = 4'b1011;Cin=0; #10
A = 4'b0110; B = 4'b1100; Cin=0;#10
A = 4'b0110; B = 4'b1101;Cin=0; #10
A = 4'b0110; B = 4'b1110;Cin=0; #10
A = 4'b0110; B = 4'b1111;Cin=0; #10
A = 4'b0111; B = 4'b0000;Cin=0; #10
A = 4'b0111; B = 4'b0001;Cin=0; #10
A = 4'b0111; B = 4'b0010;Cin=0; #10
A = 4'b0111; B = 4'b0011;Cin=0; #10
A = 4'b0111; B = 4'b0100;Cin=0; #10
A = 4'b0111; B = 4'b0101;Cin=0; #10
A = 4'b0111; B = 4'b0110;Cin=0; #10
A = 4'b0111; B = 4'b0111;Cin=0; #10
A = 4'b0111; B = 4'b1000;Cin=0; #10
A = 4'b0111; B = 4'b1001;Cin=0; #10
A = 4'b0111; B = 4'b1010;Cin=0; #10
A = 4'b0111; B = 4'b1011;Cin=0; #10
A = 4'b0111; B = 4'b1100;Cin=0; #10
A = 4'b0111; B = 4'b1101;Cin=0; #10
A = 4'b0111; B = 4'b1110;Cin=0; #10
A = 4'b0111; B = 4'b1111;Cin=0; #10
A = 4'b1000; B = 4'b0000;Cin=0; #10
A = 4'b1000; B = 4'b0001;Cin=0; #10
A = 4'b1000; B = 4'b0010;Cin=0; #10
A = 4'b1000; B = 4'b0011;Cin=0; #10
A = 4'b1000; B = 4'b0100;Cin=0; #10
A = 4'b1000; B = 4'b0101;Cin=0; #10
A = 4'b1000; B = 4'b0110;Cin=0; #10
A = 4'b1000; B = 4'b0111;Cin=0; #10
A = 4'b1000; B = 4'b1000;Cin=0; #10
A = 4'b1000; B = 4'b1001;Cin=0; #10
A = 4'b1000; B = 4'b1010;Cin=0; #10
A = 4'b1000; B = 4'b1011;Cin=0; #10
A = 4'b1000; B = 4'b1100;Cin=0; #10
A = 4'b1000; B = 4'b1101;Cin=0; #10
A = 4'b1000; B = 4'b1110;Cin=0; #10
A = 4'b1000; B = 4'b1111;Cin=0; #10
A = 4'b1001; B = 4'b0000;Cin=0; #10
A = 4'b1001; B = 4'b0001;Cin=0; #10
A = 4'b1001; B = 4'b0010;Cin=0; #10
A = 4'b1001; B = 4'b0011;Cin=0; #10
A = 4'b1001; B = 4'b0100;Cin=0; #10
A = 4'b1001; B = 4'b0101;Cin=0; #10
A = 4'b1001; B = 4'b0110;Cin=0; #10
A = 4'b1001; B = 4'b0111;Cin=0; #10
A = 4'b1001; B = 4'b1000;Cin=0; #10
A = 4'b1001; B = 4'b1001;Cin=0; #10
A = 4'b1001; B = 4'b1010;Cin=0; #10
A = 4'b1001; B = 4'b1011;Cin=0; #10
A = 4'b1001; B = 4'b1100;Cin=0; #10
A = 4'b1001; B = 4'b1101;Cin=0; #10
A = 4'b1001; B = 4'b1110;Cin=0; #10
A = 4'b1001; B = 4'b1111;Cin=0; #10
A = 4'b1010; B = 4'b0000;Cin=0; #10
A = 4'b1010; B = 4'b0001;Cin=0; #10
A = 4'b1010; B = 4'b0010;Cin=0; #10
A = 4'b1010; B = 4'b0011;Cin=0; #10
A = 4'b1010; B = 4'b0100;Cin=0; #10
A = 4'b1010; B = 4'b0101;Cin=0; #10
A = 4'b1010; B = 4'b0110;Cin=0; #10
A = 4'b1010; B = 4'b0111;Cin=0; #10
A = 4'b1010; B = 4'b1000;Cin=0; #10
A = 4'b1010; B = 4'b1001;Cin=0; #10
A = 4'b1010; B = 4'b1010;Cin=0; #10
A = 4'b1010; B = 4'b1011;Cin=0; #10
A = 4'b1010; B = 4'b1100;Cin=0; #10
A = 4'b1010; B = 4'b1101; Cin=0;#10
A = 4'b1010; B = 4'b1110;Cin=0; #10
A = 4'b1010; B = 4'b1111;Cin=0; #10
A = 4'b1011; B = 4'b0000;Cin=0; #10
A = 4'b1011; B = 4'b0001;Cin=0; #10
A = 4'b1011; B = 4'b0010;Cin=0; #10
A = 4'b1011; B = 4'b0011;Cin=0; #10
A = 4'b1011; B = 4'b0100;Cin=0; #10
A = 4'b1011; B = 4'b0101;Cin=0; #10
A = 4'b1011; B = 4'b0110;Cin=0; #10
A = 4'b1011; B = 4'b0111;Cin=0; #10
A = 4'b1011; B = 4'b1000;Cin=0; #10
A = 4'b1011; B = 4'b1001;Cin=0; #10
A = 4'b1011; B = 4'b1010;Cin=0; #10
A = 4'b1011; B = 4'b1011;Cin=0; #10
A = 4'b1011; B = 4'b1100;Cin=0; #10
A = 4'b1011; B = 4'b1101;Cin=0; #10
A = 4'b1011; B = 4'b1110;Cin=0; #10
A = 4'b1011; B = 4'b1111;Cin=0; #10
A = 4'b1100; B = 4'b0000;Cin=0; #10
A = 4'b1100; B = 4'b0001;Cin=0; #10
A = 4'b1100; B = 4'b0010;Cin=0; #10
A = 4'b1100; B = 4'b0011;Cin=0; #10
A = 4'b1100; B = 4'b0100;Cin=0; #10
A = 4'b1100; B = 4'b0101;Cin=0; #10
A = 4'b1100; B = 4'b0110;Cin=0; #10
A = 4'b1100; B = 4'b0111;Cin=0; #10
A = 4'b1100; B = 4'b1000;Cin=0; #10
A = 4'b1100; B = 4'b1001;Cin=0; #10
A = 4'b1100; B = 4'b1010;Cin=0; #10
A = 4'b1100; B = 4'b1011;Cin=0; #10
A = 4'b1100; B = 4'b1100;Cin=0; #10
A = 4'b1100; B = 4'b1101;Cin=0; #10
A = 4'b1100; B = 4'b1110;Cin=0; #10
A = 4'b1100; B = 4'b1111;Cin=0; #10
A = 4'b1101; B = 4'b0000;Cin=0; #10
A = 4'b1101; B = 4'b0001;Cin=0; #10
A = 4'b1101; B = 4'b0010;Cin=0; #10
A = 4'b1101; B = 4'b0011;Cin=0; #10
A = 4'b1101; B = 4'b0100;Cin=0; #10
A = 4'b1101; B = 4'b0101;Cin=0; #10
A = 4'b1101; B = 4'b0110;Cin=0; #10
A = 4'b1101; B = 4'b0111;Cin=0; #10
A = 4'b1101; B = 4'b1000;Cin=0; #10
A = 4'b1101; B = 4'b1001;Cin=0; #10
A = 4'b1101; B = 4'b1010;Cin=0; #10
A = 4'b1101; B = 4'b1011;Cin=0; #10
A = 4'b1101; B = 4'b1100;Cin=0; #10
A = 4'b1101; B = 4'b1101;Cin=0; #10
A = 4'b1101; B = 4'b1110;Cin=0; #10
A = 4'b1101; B = 4'b1111;Cin=0; #10
A = 4'b1110; B = 4'b0000;Cin=0; #10
A = 4'b1110; B = 4'b0001;Cin=0; #10
A = 4'b1110; B = 4'b0010;Cin=0; #10
A = 4'b1110; B = 4'b0011;Cin=0; #10
A = 4'b1110; B = 4'b0100;Cin=0; #10
A = 4'b1110; B = 4'b0101;Cin=0; #10
A = 4'b1110; B = 4'b0110;Cin=0; #10
A = 4'b1110; B = 4'b0111;Cin=0; #10
A = 4'b1110; B = 4'b1000;Cin=0; #10
A = 4'b1110; B = 4'b1001;Cin=0; #10
A = 4'b1110; B = 4'b1010;Cin=0; #10
A = 4'b1110; B = 4'b1011;Cin=0; #10
A = 4'b1110; B = 4'b1100;Cin=0; #10
A = 4'b1110; B = 4'b1101;Cin=0; #10
A = 4'b1110; B = 4'b1110;Cin=0; #10
A = 4'b1110; B = 4'b1111;Cin=0; #10
A = 4'b1111; B = 4'b0000;Cin=0; #10
A = 4'b1111; B = 4'b0001;Cin=0; #10
A = 4'b1111; B = 4'b0010;Cin=0; #10
A = 4'b1111; B = 4'b0011;Cin=0; #10
A = 4'b1111; B = 4'b0100;Cin=0; #10
A = 4'b1111; B = 4'b0101;Cin=0; #10
A = 4'b1111; B = 4'b0110;Cin=0; #10
A = 4'b1111; B = 4'b0111;Cin=0; #10
A = 4'b1111; B = 4'b1000;Cin=0; #10
A = 4'b1111; B = 4'b1001;Cin=0; #10
A = 4'b1111; B = 4'b1010;Cin=0; #10
A = 4'b1111; B = 4'b1011;Cin=0; #10
A = 4'b1111; B = 4'b1100;Cin=0; #10
A = 4'b1111; B = 4'b1101;Cin=0; #10
A = 4'b1111; B = 4'b1110;Cin=0; #10
A = 4'b1111; B = 4'b1111;Cin=0; #10
A = 4'b0000; B = 4'b0000;Cin=1; #10
A = 4'b0000; B = 4'b0001;Cin=1; #10
A = 4'b0000; B = 4'b0010;Cin=1; #10
A = 4'b0000; B = 4'b0011;Cin=1; #10
A = 4'b0000; B = 4'b0100;Cin=1; #10
A = 4'b0000; B = 4'b0101;Cin=1; #10
A = 4'b0000; B = 4'b0110;Cin=1; #10
A = 4'b0000; B = 4'b0111;Cin=1; #10
A = 4'b0000; B = 4'b1000;Cin=1; #10
A = 4'b0000; B = 4'b1001;Cin=1; #10
A = 4'b0000; B = 4'b1010;Cin=1; #10
A = 4'b0000; B = 4'b1011;Cin=1; #10
A = 4'b0000; B = 4'b1100;Cin=1; #10
A = 4'b0000; B = 4'b1101;Cin=1; #10
A = 4'b0000; B = 4'b1110;Cin=1; #10
A = 4'b0000; B = 4'b1111;Cin=1; #10
A = 4'b0001; B = 4'b0000;Cin=1; #10
A = 4'b0001; B = 4'b0001;Cin=1; #10
A = 4'b0001; B = 4'b0010;Cin=1; #10
A = 4'b0001; B = 4'b0011;Cin=1; #10
A = 4'b0001; B = 4'b0100;Cin=1; #10
A = 4'b0001; B = 4'b0101;Cin=1; #10
A = 4'b0001; B = 4'b0110;Cin=1; #10
A = 4'b0001; B = 4'b0111;Cin=1; #10
A = 4'b0001; B = 4'b1000;Cin=1; #10
A = 4'b0001; B = 4'b1001;Cin=1; #10
A = 4'b0001; B = 4'b1010;Cin=1; #10
A = 4'b0001; B = 4'b1011;Cin=1; #10
A = 4'b0001; B = 4'b1100;Cin=1; #10
A = 4'b0001; B = 4'b1101;Cin=1; #10
A = 4'b0001; B = 4'b1110;Cin=1; #10
A = 4'b0001; B = 4'b1111;Cin=1; #10
A = 4'b0010; B = 4'b0000;Cin=1; #10
A = 4'b0010; B = 4'b0001;Cin=1; #10
A = 4'b0010; B = 4'b0010;Cin=1; #10
A = 4'b0010; B = 4'b0011;Cin=1; #10
A = 4'b0010; B = 4'b0100;Cin=1; #10
A = 4'b0010; B = 4'b0101;Cin=1; #10
A = 4'b0010; B = 4'b0110;Cin=1; #10
A = 4'b0010; B = 4'b0111;Cin=1; #10
A = 4'b0010; B = 4'b1000;Cin=1; #10
A = 4'b0010; B = 4'b1001;Cin=1; #10
A = 4'b0010; B = 4'b1010;Cin=1; #10
A = 4'b0010; B = 4'b1011;Cin=1; #10
A = 4'b0010; B = 4'b1100;Cin=1; #10
A = 4'b0010; B = 4'b1101;Cin=1; #10
A = 4'b0010; B = 4'b1110;Cin=1; #10
A = 4'b0010; B = 4'b1111;Cin=1; #10
A = 4'b0011; B = 4'b0000;Cin=1; #10
A = 4'b0011; B = 4'b0001;Cin=1; #10
A = 4'b0011; B = 4'b0010;Cin=1; #10
A = 4'b0011; B = 4'b0011;Cin=1; #10
A = 4'b0011; B = 4'b0100;Cin=1; #10
A = 4'b0011; B = 4'b0101;Cin=1; #10
A = 4'b0011; B = 4'b0110;Cin=1; #10
A = 4'b0011; B = 4'b0111;Cin=1; #10
A = 4'b0011; B = 4'b1000;Cin=1; #10
A = 4'b0011; B = 4'b1001;Cin=1; #10
A = 4'b0011; B = 4'b1010;Cin=1; #10
A = 4'b0011; B = 4'b1011;Cin=1; #10
A = 4'b0011; B = 4'b1100;Cin=1; #10
A = 4'b0011; B = 4'b1101;Cin=1; #10
A = 4'b0011; B = 4'b1110;Cin=1; #10
A = 4'b0011; B = 4'b1111;Cin=1; #10
A = 4'b0100; B = 4'b0000;Cin=1; #10
A = 4'b0100; B = 4'b0001;Cin=1; #10
A = 4'b0100; B = 4'b0010;Cin=1; #10
A = 4'b0100; B = 4'b0011;Cin=1; #10
A = 4'b0100; B = 4'b0100;Cin=1; #10
A = 4'b0100; B = 4'b0101;Cin=1; #10
A = 4'b0100; B = 4'b0110;Cin=1; #10
A = 4'b0100; B = 4'b0111;Cin=1; #10
A = 4'b0100; B = 4'b1000;Cin=1; #10
A = 4'b0100; B = 4'b1001;Cin=1; #10
A = 4'b0100; B = 4'b1010;Cin=1; #10
A = 4'b0100; B = 4'b1011;Cin=1; #10
A = 4'b0100; B = 4'b1100;Cin=1; #10
A = 4'b0100; B = 4'b1101;Cin=1; #10
A = 4'b0100; B = 4'b1110;Cin=1; #10
A = 4'b0100; B = 4'b1111;Cin=1; #10
A = 4'b0101; B = 4'b0000;Cin=1; #10
A = 4'b0101; B = 4'b0001;Cin=1; #10
A = 4'b0101; B = 4'b0010;Cin=1; #10
A = 4'b0101; B = 4'b0011;Cin=1; #10
A = 4'b0101; B = 4'b0100;Cin=1; #10
A = 4'b0101; B = 4'b0101;Cin=1; #10
A = 4'b0101; B = 4'b0110;Cin=1; #10
A = 4'b0101; B = 4'b0111;Cin=1; #10
A = 4'b0101; B = 4'b1000;Cin=1; #10
A = 4'b0101; B = 4'b1001;Cin=1; #10
A = 4'b0101; B = 4'b1010;Cin=1; #10
A = 4'b0101; B = 4'b1011;Cin=1; #10
A = 4'b0101; B = 4'b1100;Cin=1; #10
A = 4'b0101; B = 4'b1101;Cin=1; #10
A = 4'b0101; B = 4'b1110;Cin=1; #10
A = 4'b0101; B = 4'b1111;Cin=1; #10
A = 4'b0110; B = 4'b0000;Cin=1; #10
A = 4'b0110; B = 4'b0001;Cin=1; #10
A = 4'b0110; B = 4'b0010;Cin=1; #10
A = 4'b0110; B = 4'b0011;Cin=1; #10
A = 4'b0110; B = 4'b0100;Cin=1; #10
A = 4'b0110; B = 4'b0101;Cin=1; #10
A = 4'b0110; B = 4'b0110;Cin=1; #10
A = 4'b0110; B = 4'b0111;Cin=1; #10
A = 4'b0110; B = 4'b1000;Cin=1; #10
A = 4'b0110; B = 4'b1001;Cin=1; #10
A = 4'b0110; B = 4'b1010;Cin=1; #10
A = 4'b0110; B = 4'b1011;Cin=1; #10
A = 4'b0110; B = 4'b1100; Cin=1;#10
A = 4'b0110; B = 4'b1101;Cin=1; #10
A = 4'b0110; B = 4'b1110;Cin=1; #10
A = 4'b0110; B = 4'b1111;Cin=1; #10
A = 4'b0111; B = 4'b0000;Cin=1; #10
A = 4'b0111; B = 4'b0001;Cin=1; #10
A = 4'b0111; B = 4'b0010;Cin=1; #10
A = 4'b0111; B = 4'b0011;Cin=1; #10
A = 4'b0111; B = 4'b0100;Cin=1; #10
A = 4'b0111; B = 4'b0101;Cin=1; #10
A = 4'b0111; B = 4'b0110;Cin=1; #10
A = 4'b0111; B = 4'b0111;Cin=1; #10
A = 4'b0111; B = 4'b1000;Cin=1; #10
A = 4'b0111; B = 4'b1001;Cin=1; #10
A = 4'b0111; B = 4'b1010;Cin=1; #10
A = 4'b0111; B = 4'b1011;Cin=1; #10
A = 4'b0111; B = 4'b1100;Cin=1; #10
A = 4'b0111; B = 4'b1101;Cin=1; #10
A = 4'b0111; B = 4'b1110;Cin=1; #10
A = 4'b0111; B = 4'b1111;Cin=1; #10
A = 4'b1000; B = 4'b0000;Cin=1; #10
A = 4'b1000; B = 4'b0001;Cin=1; #10
A = 4'b1000; B = 4'b0010;Cin=1; #10
A = 4'b1000; B = 4'b0011;Cin=1; #10
A = 4'b1000; B = 4'b0100;Cin=1; #10
A = 4'b1000; B = 4'b0101;Cin=1; #10
A = 4'b1000; B = 4'b0110;Cin=1; #10
A = 4'b1000; B = 4'b0111;Cin=1; #10
A = 4'b1000; B = 4'b1000;Cin=1; #10
A = 4'b1000; B = 4'b1001;Cin=1; #10
A = 4'b1000; B = 4'b1010;Cin=1; #10
A = 4'b1000; B = 4'b1011;Cin=1; #10
A = 4'b1000; B = 4'b1100;Cin=1; #10
A = 4'b1000; B = 4'b1101;Cin=1; #10
A = 4'b1000; B = 4'b1110;Cin=1; #10
A = 4'b1000; B = 4'b1111;Cin=1; #10
A = 4'b1001; B = 4'b0000;Cin=1; #10
A = 4'b1001; B = 4'b0001;Cin=1; #10
A = 4'b1001; B = 4'b0010;Cin=1; #10
A = 4'b1001; B = 4'b0011;Cin=1; #10
A = 4'b1001; B = 4'b0100;Cin=1; #10
A = 4'b1001; B = 4'b0101;Cin=1; #10
A = 4'b1001; B = 4'b0110;Cin=1; #10
A = 4'b1001; B = 4'b0111;Cin=1; #10
A = 4'b1001; B = 4'b1000;Cin=1; #10
A = 4'b1001; B = 4'b1001;Cin=1; #10
A = 4'b1001; B = 4'b1010;Cin=1; #10
A = 4'b1001; B = 4'b1011;Cin=1; #10
A = 4'b1001; B = 4'b1100;Cin=1; #10
A = 4'b1001; B = 4'b1101;Cin=1; #10
A = 4'b1001; B = 4'b1110;Cin=1; #10
A = 4'b1001; B = 4'b1111;Cin=1; #10
A = 4'b1010; B = 4'b0000;Cin=1; #10
A = 4'b1010; B = 4'b0001;Cin=1; #10
A = 4'b1010; B = 4'b0010;Cin=1; #10
A = 4'b1010; B = 4'b0011;Cin=1; #10
A = 4'b1010; B = 4'b0100;Cin=1; #10
A = 4'b1010; B = 4'b0101;Cin=1; #10
A = 4'b1010; B = 4'b0110;Cin=1; #10
A = 4'b1010; B = 4'b0111;Cin=1; #10
A = 4'b1010; B = 4'b1000;Cin=1; #10
A = 4'b1010; B = 4'b1001;Cin=1; #10
A = 4'b1010; B = 4'b1010;Cin=1; #10
A = 4'b1010; B = 4'b1011;Cin=1; #10
A = 4'b1010; B = 4'b1100;Cin=1; #10
A = 4'b1010; B = 4'b1101; Cin=1;#10
A = 4'b1010; B = 4'b1110;Cin=1; #10
A = 4'b1010; B = 4'b1111;Cin=1; #10
A = 4'b1011; B = 4'b0000;Cin=1; #10
A = 4'b1011; B = 4'b0001;Cin=1; #10
A = 4'b1011; B = 4'b0010;Cin=1; #10
A = 4'b1011; B = 4'b0011;Cin=1; #10
A = 4'b1011; B = 4'b0100;Cin=1; #10
A = 4'b1011; B = 4'b0101;Cin=1; #10
A = 4'b1011; B = 4'b0110;Cin=1; #10
A = 4'b1011; B = 4'b0111;Cin=1; #10
A = 4'b1011; B = 4'b1000;Cin=1; #10
A = 4'b1011; B = 4'b1001;Cin=1; #10
A = 4'b1011; B = 4'b1010;Cin=1; #10
A = 4'b1011; B = 4'b1011;Cin=1; #10
A = 4'b1011; B = 4'b1100;Cin=1; #10
A = 4'b1011; B = 4'b1101;Cin=1; #10
A = 4'b1011; B = 4'b1110;Cin=1; #10
A = 4'b1011; B = 4'b1111;Cin=1; #10
A = 4'b1100; B = 4'b0000;Cin=1; #10
A = 4'b1100; B = 4'b0001;Cin=1; #10
A = 4'b1100; B = 4'b0010;Cin=1; #10
A = 4'b1100; B = 4'b0011;Cin=1; #10
A = 4'b1100; B = 4'b0100;Cin=1; #10
A = 4'b1100; B = 4'b0101;Cin=1; #10
A = 4'b1100; B = 4'b0110;Cin=1; #10
A = 4'b1100; B = 4'b0111;Cin=1; #10
A = 4'b1100; B = 4'b1000;Cin=1; #10
A = 4'b1100; B = 4'b1001;Cin=1; #10
A = 4'b1100; B = 4'b1010;Cin=1; #10
A = 4'b1100; B = 4'b1011;Cin=1; #10
A = 4'b1100; B = 4'b1100;Cin=1; #10
A = 4'b1100; B = 4'b1101;Cin=1; #10
A = 4'b1100; B = 4'b1110;Cin=1; #10
A = 4'b1100; B = 4'b1111;Cin=1; #10
A = 4'b1101; B = 4'b0000;Cin=1; #10
A = 4'b1101; B = 4'b0001;Cin=1; #10
A = 4'b1101; B = 4'b0010;Cin=1; #10
A = 4'b1101; B = 4'b0011;Cin=1; #10
A = 4'b1101; B = 4'b0100;Cin=1; #10
A = 4'b1101; B = 4'b0101;Cin=1; #10
A = 4'b1101; B = 4'b0110;Cin=1; #10
A = 4'b1101; B = 4'b0111;Cin=1; #10
A = 4'b1101; B = 4'b1000;Cin=1; #10
A = 4'b1101; B = 4'b1001;Cin=1; #10
A = 4'b1101; B = 4'b1010;Cin=1; #10
A = 4'b1101; B = 4'b1011;Cin=1; #10
A = 4'b1101; B = 4'b1100;Cin=1; #10
A = 4'b1101; B = 4'b1101;Cin=1; #10
A = 4'b1101; B = 4'b1110;Cin=1; #10
A = 4'b1101; B = 4'b1111;Cin=1; #10
A = 4'b1110; B = 4'b0000;Cin=1; #10
A = 4'b1110; B = 4'b0001;Cin=1; #10
A = 4'b1110; B = 4'b0010;Cin=1; #10
A = 4'b1110; B = 4'b0011;Cin=1; #10
A = 4'b1110; B = 4'b0100;Cin=1; #10
A = 4'b1110; B = 4'b0101;Cin=1; #10
A = 4'b1110; B = 4'b0110;Cin=1; #10
A = 4'b1110; B = 4'b0111;Cin=1; #10
A = 4'b1110; B = 4'b1000;Cin=1; #10
A = 4'b1110; B = 4'b1001;Cin=1; #10
A = 4'b1110; B = 4'b1010;Cin=1; #10
A = 4'b1110; B = 4'b1011;Cin=1; #10
A = 4'b1110; B = 4'b1100;Cin=1; #10
A = 4'b1110; B = 4'b1101;Cin=1; #10
A = 4'b1110; B = 4'b1110;Cin=1; #10
A = 4'b1110; B = 4'b1111;Cin=1; #10
A = 4'b1111; B = 4'b0000;Cin=1; #10
A = 4'b1111; B = 4'b0001;Cin=1; #10
A = 4'b1111; B = 4'b0010;Cin=1; #10
A = 4'b1111; B = 4'b0011;Cin=1; #10
A = 4'b1111; B = 4'b0100;Cin=1; #10
A = 4'b1111; B = 4'b0101;Cin=1; #10
A = 4'b1111; B = 4'b0110;Cin=1; #10
A = 4'b1111; B = 4'b0111;Cin=1; #10
A = 4'b1111; B = 4'b1000;Cin=1; #10
A = 4'b1111; B = 4'b1001;Cin=1; #10
A = 4'b1111; B = 4'b1010;Cin=1; #10
A = 4'b1111; B = 4'b1011;Cin=1; #10
A = 4'b1111; B = 4'b1100;Cin=1; #10
A = 4'b1111; B = 4'b1101;Cin=1; #10
A = 4'b1111; B = 4'b1110;Cin=1; #10
A = 4'b1111; B = 4'b1111;Cin=1;
end
endmodule
## QUESTION 3
`code`
module multiplexer(i1,i2,s,o);
input i1;
input i2;
input s;
output o;
wire x,y,not_s;
not(not_s,s);
and(x,i1,s);
and(y,i2,not_s);
or(o,x,y);
endmodule
### testbench
`code`
module multiplexer_TB();
reg i1,i2,s;
wire o;
multiplexer(.i1(i1),.i2(i2),.s(s),.o(o));
initial
begin
i1=0;i2=0;s=0;
i1=0;i2=0;s=1;
i1=0;i2=1;s=0;
i1=0;i2=1;s=1;
i1=1;i2=0;s=0;
i1=1;i2=0;s=1;
i1=1;i2=1;s=0;
i1=1;i2=1;s=1;
end
endmodule
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