first commit

project-1-boolean-logic/01/Xor.hdl

@@ -0,0 +1,23 @@
+// 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:
+
+    Not(in=a , out=nota );
+    Not(in=b , out=notb );
+
+    And(a= a, b= notb , out= aAndNotB );
+    And(a= b, b=  nota, out= bAndNotA );
+
+    Or(a= aAndNotB, b=bAndNotA , out= out);
+
+    //// Replace this comment with your code.
+}