feat: UNIT 2 HDL

project-2-boolean-arithmetic/hdl/FullAdder.hdl

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+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/2/FullAdder.hdl
+/**
+ * Computes the sum of three bits.
+ */
+CHIP FullAdder {
+    IN a, b, c;  // 1-bit inputs
+    OUT sum,     // Right bit of a + b + c
+        carry;   // Left bit of a + b + c
+
+    PARTS:
+
+    // 1st half adder
+    HalfAdder(a=a , b=b , sum=abSum , carry=abCarry);
+    // 2nd half adder
+    HalfAdder(a=abSum , b=c , sum=sum , carry=abSumCCarry);
+    // Carry Or
+    Or(a= abCarry, b=abSumCCarry , out=carry );
+
+}