add: for sample, fix bugs, and make test harness

samples/fib.rpg

@@ -0,0 +1,27 @@
+**FREE
+Ctl-Opt Main(Perform_Fibonacci_Sequence);
+
+Dcl-Proc Perform_Fibonacci_Sequence;
+
+    Dcl-s i   Uns(10);
+    Dcl-s fib Uns(10) Dim(10);
+
+    // Display a title
+    Dsply ('Fibonacci Sequence:');
+
+    // Initialize the first two elements of the array
+    fib(1) = 0; // The sequence usually starts with 0 and 1
+    fib(2) = 1;
+
+    // Loop to calculate the rest of the sequence
+    For i = 3 to %Elem(fib);
+        // Each number is the sum of the two preceding ones
+        fib(i) = fib(i-1) + fib(i-2);
+    Endfor;
+
+    // Loop to display the sequence numbers
+    For i = 1 to %Elem(fib);
+        Dsply (' ' + %Char(fib(i)));
+    Endfor;
+
+End-Proc Perform_Fibonacci_Sequence;