2I/P- 5BIT WIDE ADDER 

module add2_5b (c1,s,a,b);
input [4:0]a,b;
output [4:0]s;
output c1;
fa ra1 (c0,s[0],a[0],b[0],1'b0);
fa ra2 (c1,s[1],a[1],b[1],c0);
fa ra3 (c2,s[2],a[2],b[2],c1);
fa ra4 (c3,s[3],a[3],b[3],c2);
fa ra5 (c1,s[4],a[4],b[4],c3);
endmodule

TEST BENCH:-

module add2_5b_tb();
reg [4:0]a,b;
wire [4:0]s;
wire c;
add2_5b dut (c,s,a,b);
initial
begin
repeat(20)
begin
a=$random;
b=$random;
#1;
$display({a}," ",{b},":",{c,s});
end
end
endmodule