Conditions.cbl
	An example program demonstrating the use of Condition Names (level 88's).
 
Perform1.cbl
	An example program demonstrating how the first format of the PERFORM may be used to change the flow of control through a program.
 
Perform2.cbl
	Demonstrates the second format of the PERFORM. The PERFORM..TIMES may be used to execute a block of code x number of times.
 
Perform3.cbl
	Demonstrates how the PERFORM..UNTIL (third format) may be used to process a stream of values where the length of the stream cannot be determined in advance (although in this case there is a set maximum number of values in the stream).
 
Perform4.cbl
	Demonstrates how the PERFORM..VARYING and the PERFORM..VARYING..AFTER (fourth format) may be used for counting iteration. Also introduces the WITH TEST BEFORE and WITH TEST AFTER phrases.
 
MileageCount.cbl
	Demonstrates how the PERFORM..VARYING and the PERFORM..VARYING..AFTER (fourth format) may be used to simulate a mileage counter.