Specifications

Chapter 14. Statement Reference
226
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.