Implement basic logic gates: Not, And, Or, Xor, Mux, DMux

01/Mux.hdl

@@ -2,7 +2,7 @@
 // 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
  */
@@ -11,5 +11,9 @@ CHIP Mux {
     OUT out;
 
     PARTS:
-    //// Replace this comment with your code.
-}
+    // Mux(a,b,sel) = Or(And(a, Not(sel)), And(b, sel))
+    Not(in=sel, out=notSel);
+    And(a=a, b=notSel, out=aAndNotSel);
+    And(a=b, b=sel, out=bAndSel);
+    Or(a=aAndNotSel, b=bAndSel, out=out);
+}