Update 'zadania/zadanie_4'

zadania/zadanie_4

@@ -0,0 +1,41 @@
+CHIP Or {
+
+    IN  a, b;
+    OUT out;
+
+    PARTS:
+  	Not(in=a, out=notAOut);
+		Not(in=b, out=notBOut);
+		Nand(a=notAOut, b=notBOut, out=out);
+}
+
+CHIP Xor {
+
+   IN  a, b;
+   OUT out;
+
+   PARTS:
+  Not(in=b, out=NotB);
+  Not(in=a, out=NotA);
+  
+  Nand(a=a, b=NotB, out=Nand1);
+  Nand(a=NotA, b=b, out=Nand2);
+  
+  Nand(a=Nand1, b=Nand2, out=out);
+}
+
+CHIP Mux {
+
+   IN  a, b, sel;
+   OUT out;
+
+   PARTS:
+  
+	Not(in=sel, out=notSel);
+  
+  And(a=a, b=notSel, out=And1);
+  And(a=b, b=notSel, out=And2);
+  
+  Or(a=And1, b=And2, out=out);
+
+}