IF Statement

If/then statements conditionally execute a group of commands, depending on the value of an expression.

Syntax

IF condition THEN statement [ELSE else statement]

Alternatively, you can use the multi-line syntax:

IF condition THEN

   statements

ELSE

   else statements

ENDIF

condition                                 Any expression that evaluates to TRUE  or FALSE

statement,                                Statement(s) executed IF condition  is TRUE .

else statements                        Statement(s) executed IF condition  is FALSE .

When executing the IF statement, condition is tested. If condition  is TRUE , the statements following THEN  are executed. If condition  is FALSE , the statements following ELSE are executed. After executing the statements following THEN  or ELSE, execution continues with the statement following ENDIF.

Examples

IF ( a = 0 ) THEN print "OK"

IF ( a = 0 ) or ( b = 0 ) THEN c = ( c - 1 ) ELSE c = ( c + 1 )

IF  ( a = 0 ) THEN

    ( b = 0 )

    ( c = 0 )

ELSE

    ( b = 1 )

    ( c = 1 )

ENDIF

You can nest IF  statements by placing one IF  within another:

IF  ( a = 0 ) THEN

  IF ( b = 0 ) THEN

      ( c = 0 )

  ELSE

      ( c = 1 )

  ENDIF

ENDIF