User`s guide

Conditional Branching Instructions
Conditional branching instructions allow you to execute blocks of code based on the current
values of program variables or expressions. V+ has three conditional branch instructions:
l IF...GOTO
l IF...THEN...ELSE
l CASE value OF
IF...GOTO
IF...GOTO behaves similarly to GOTO, but a condition can be attached to the branch. If the
instruction:
IF logical_expression GOTO 100
is encountered, the branch to label 100 occurs only if logical_expression has a value of true.
IF...THEN...ELSE
The basic conditional instruction is the IF...THEN...ELSE clause. This instruction has two
forms:
IF expression THEN
code block (executed when expression is true)
END
IF expression THEN
code block (executed when expression is true)
ELSE
code block (executed when expression is false)
END
expressionis any well-formed Boolean expression (described above).
In the following example, if program execution reaches step 59 and num_parts is greater
than 75, step 60 is executed. Otherwise, execution resumes at step 62.
56 .
57 ;CALL "check_num" if "num_parts" is greater than 75
58
59 IF num_parts > 75 THEN
60 CALL check_num(num_parts)
61 END
62 .
In the following example, if program execution reaches step 37 with input signal 1033 on
and need_part true, the program executes steps 38 to 40 and resumes at step 44.
Otherwise, it executes step 42 and resumes at step 44.
Conditional Branching Instructions
(Undefined variable: Primary.Product_Name_V)Language User's Guide, version
17.x
Page 129