Test programs for PERFORMs. 
*   PERFORM.
*   PERFORM ... VARYING UNTIL WITH TEST AFTER/BEFORE option.
*   PERFORM ... UNTIL WITH TEST AFTER/BEFORE option.
*   PERFORM (In-line) VARYING UNTIL WITH TEST AFTER/BEFORE option.
*   PERFORM (In-line) UNTIL WITH TEST AFTER/BEFORE option.


To compile test program run r.sh. 

The shell script will run make and create a trace file trace.txt.
  
To clean type make clean.
