Complete first project

1_Boolean_Arithmetic/Mux.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/Mux.hdl
+/** 
+ * Multiplexor:
+ * if (sel = 0) out = a, else out = b
+ */
+CHIP Mux {
+    IN a, b, sel;
+    OUT out;
+
+    PARTS:
+    Not(in=sel, out=nsel);
+    And(a=nsel, b=a, out=aa);
+    And(a=sel, b=b, out=bb);
+    Or(a=aa, b=bb, out=out);
+}