题目：Create a 100-bit binary adder. The adder adds two 100-bit numbers and a carry-in to produce a 100-bit sum and carry out.

解题：

module top_module( 
    input [99:0] a, b,
    input cin,
    output cout,
    output [99:0] sum );
    wire [99:0]cc;
	assign sum[0] = a[0]^b[0]^cin;
    assign cc[0] = a[0]&b[0] | b[0]&cin | a[0]&cin;
    integer i=1;
    always@(*)begin
        for(i=1;i<100;i++)begin
            sum[i] = a[i]^b[i]^cc[i-1];
        	cc[i] = a[i]&b[i] | b[i]&cc[i-1] | a[i]&cc[i-1];
    	end
    end
    assign cout=cc[99];
        
endmodule

解题正确：