Complete first project

1_Boolean_Arithmetic/Xor.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/1/Xor.hdl
+/**
+ * Exclusive-or gate:
+ * if ((a and Not(b)) or (Not(a) and b)) out = 1, else out = 0
+ */
+CHIP Xor {
+    IN a, b;
+    OUT out;
+
+    PARTS:
+    Nand(a=a,b=b,out=nab);
+    Or(a=a,b=b,out=orab);
+    And(a=nab, b=orab, out=out);
+}