Added book examples

C19/enum_example.c

@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+enum DOW { sun, mon, tue, wed, thu, fri, sat } ;
+
+// Main () - execution starts here
+int main (void)
+{
+    enum DOW day;
+
+    /* Code that get a value for 'day' */
+    day = tue;
+
+    switch (day)
+    {
+        case sun : printf ("Sunday\n") ; break ;
+        case mon : printf ("Monday\n") ; break ;
+        case tue : printf ("Tuesday\n") ; break ;
+        /* etc. */
+    }
+    return (0);     // Exit indicating success
+}