first commit

adder_nbit/adder_nbit_tb.v

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+`include "./adder_nbit/adder_nbit.v"
+
+module adder_nbit_tb;
+    reg [7:0] a, b;
+    reg carry_in;
+
+    wire [7:0] sum;
+    wire carry_out;
+
+    adder_nbit adder_8bit(
+        .a(a),
+        .b(b),
+        .carry_in(carry_in),
+        .sum(sum),
+        .carry_out(carry_out)
+    );
+
+    initial begin
+        $dumpfile("./adder_nbit/adder_nbit.vcd");
+        $dumpvars(0, adder_nbit_tb);
+
+        a = 0; b = 5; carry_in = 0;
+        #1
+        $display("a=%d, b=%d, sum=%d, carry=%b", a, b, sum, carry_out);
+        a = 10; b = 5; carry_in = 0;
+        #1
+        $display("a=%d, b=%d, sum=%d, carry=%b", a, b, sum, carry_out);
+        a = 100; b = 5; carry_in = 0;
+        #1
+        $display("a=%d, b=%d, sum=%d, carry=%b", a, b, sum, carry_out);
+
+    end 
+
+endmodule