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Chapter 14. Statement Reference

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Flow control statement

IF…THEN…ELSE…END IF

Conditionally executes specified statement blocks depending upon the evaluation of a

conditional expression.

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Syntax:

Syntax:Syntax:

Syntax:

Syntax 1:

IF conditionalexpression THEN

statementblock1

［ELSE

statementblock2]

END IF

Syntax 2:

IF conditionalexpression ELSE

statementblock

END IF

Parameter:

Parameter:Parameter:

Parameter:

conditionalexpression

A numeric expression which evaluates to true or false.

Description:

Description:Description:

Description:

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

condition is true (not zero), statementblock which follows THEN is executed; 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 ..CASEEND

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

30 levels.

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