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--- intro_example:alu [2025/04/21 23:27] – created rajit
+++ intro_example:alu [2025/04/21 23:49] (current) – rajit
@@ Line 34: / Line 34: @@
           [] c = 1 -> O!(a-b)
           [] c = 2 -> O!(a&b)
-          [] c = 3 -> O!(a | b)
+          [] c = 3 -> O!(a|b)
        ] ]
     }
 }
 </code>
+====== Using enumerations ======
+Rather than hard-coding the control values, a user-defined enumeration can be used to make the ACT
+more readable.
+<code act>
+defenum alu_ctrl {
+   ADD, SUB, AND, OR
+};
+defproc alu (chan?(int) A, B; chan?(alu_ctrl) ctrl; chan!(int) O)
+{
+   int a, b;
+   alu_ctrl c;
+   chp {
+      *[ A?a, B?b, ctrl?c;
+          [ c = alu_ctrl.ADD -> O!(a+b)
+          [] c = alu_ctrl.SUB -> O!(a-b)
+          [] c = alu_ctrl.AND -> O!(a&b)
+          [] c = alu_ctrl.OR -> O!(a|b)
+       ] ]
+    }
+}
+</code>