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Chapter 8 PAC Language Syntax

8-13

8.8 Flow Control Statement

Use a flow control statement to control the execution sequence of each

statement in a program.

Use a label in a program control flow statement to indicate the position of it in a

program.

The flow control can be roughly classified into 5 statements: unconditional

branch, conditional branch, selection, repeat and calling defined process.

8.8.1 Unconditional Branch

Use this to transfer program execution to an arbitrary position. Describe a

label for the statement you would like to execute next, after the GOTO

command.

Example: GOTO *LABEL1

8.8.2 Conditional Branch

If an IF ~ THEN ~ ELSE statement or IF ~ ENDIF statement is used, a branch

destination determines whether the designated condition is satisfied.

If the relational expression value described just after IF is true (TRUE (1) ), the

process after THEN is executed. Otherwise, the process after ELSE is

executed.

8.8.3 Selection

Depending on the value of a designated expression, the process to be

executed is selected. There are 3 commands.

In SELECT CASE statements, place an arithmetic expression after CASE on

the SELECT line. The process is executed from the line of CASE that has a

value satisfying this arithmetic expression to the next CASE line or the END

SELECT line. If those CASE lines do not satisfy the expression, the process is

executed from the line after CASE ELSE to the END SELECT line.

In ON ~ GOSUB statements place an arithmetic expression after ON. The

process proceeds to a subroutine according to the value of the arithmetic

expression.

In ON ~ GOTO statements place an arithmetic expression after ON. The

process proceeds to a label name according to the value of the arithmetic

expression.

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