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full_adder/full_adder.v

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+/*
+    Full Adder Declaration
+
+    A  B  Cin | Sum  Cout
+    0  0   0  |  0    0
+    0  0   1  |  1    0
+    0  1   0  |  1    0
+    0  1   1  |  0    1
+    1  0   0  |  1    0
+    1  0   1  |  0    1
+    1  1   0  |  0    1
+    1  1   1  |  1    1
+*/
+`include "./half_adder/half_adder.v"
+
+module full_adder_structural (carry_in, a, b, sum, carry_out);
+    input carry_in, a, b;
+    output sum, carry_out;
+
+    wire add1_sum, add1_carry;
+    wire add2_carry;
+
+    half_adder add1(a, b, add1_sum, add1_carry);
+    half_adder add2(add1_sum, carry_in, sum, add2_carry);
+
+    or final_or(carry_out, add1_carry, add2_carry);
+endmodule
+
+module full_adder_dataflow (carry_in, a, b, sum, carry_out);
+    input carry_in, a, b;
+    output sum, carry_out;
+
+    assign sum = a ^ b ^ carry_in;
+    assign carry_out = (a & b) | (carry_in & (a ^ b));
+endmodule
+
+module full_adder_behavioral (carry_in, a, b, sum, carry_out);
+    input carry_in, a, b;
+    output reg sum, carry_out;
+
+    always @(*) begin
+        sum = a ^ b ^ carry_in;
+        carry_out = (a & b) | (carry_in & (a ^ b));
+    end
+endmodule