Flow control

Process flow control functions are the functions that execute the decision making and resultant logic branches in executable code. IF-THEN-ELSE, discussed in Chapter 6, Introduction to C/SIDE and C/AL, is also a member of this class of functions. Here, we will discuss the following:

• REPEAT - UNTIL
• WHILE - DO
• FOR-TO and FOR-DOWNTO
• CASE - ELSE
• WITH - DO
• QUIT, BREAK, EXIT, and SKIP

REPEAT-UNTIL

REPEAT-UNTIL allows us to create a repetitive code loop, which REPEATs a block of code UNTIL a specific conditional expression evaluates to TRUE. In that sense, REPEAT-UNTIL defines a block of code, operating somewhat like the BEGIN-END compound statement structure that we covered in Chapter 6, Introduction to C/SIDE and C/AL. REPEAT tells the system to keep reprocessing...