Denso Power Net Terminal BHT-103 Dokumentacja Pobierz pdf (Strona 234)

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101

Chapter 14. Statement Reference

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Syntax:

Syntax 1:

IF conditionalexpression THEN

statementblock1

[ELSE

statementblock2]

END IF

Syntax 2:

IF conditionalexpression ELSE

statementblock

END IF

Parameter:

conditionalexpression

A numeric expression which evaluates to true or false.

Description:

IF statement block tests whether conditionalexpression is true or false. If

the condition is true (not zero), statementblock which follows THEN is exe-

cuted; if it is false (zero), statementblock which follows ELSE is executed.

Then, program control passes to the first statement after

END IF.

• You can omit either

THEN block or ELSE block.

•

IF statement block should terminate with END IF which indicates the end of the

block.

•

IF statement blocks can be nested. When using the IF statement block together

with other block-structured statements (

DEF FN...END DEF, FOR...NEXT, FUNC-

TION...END

FUNCTION, IF...THEN...ELSE...END IF, SELECT...CASE…END

SELECT

, SUB...END SUB, and WHILE...WEND), you can nest them to a maxi-

mum of 30 levels.

Flow control statement

IF...THEN...ELSE...END IF

Conditionally executes specified statement blocks depending upon the evaluation of a condi-

tional expression.

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