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IF
Syntax
IF Expression [ { AND IF | OR IF } Expression ... ] THEN
  ...
[ ELSE IF Expression [ { AND IF | OR IF } Expression ... ] THEN
  ... ]
[ ELSE
  ... ]
ENDIF

Conditional control structure.

When you use several test expressions splitted by AND IF keywords, then they are evaluated from left to right until the first FALSE one is found, and then the test is FALSE. If all expressions are TRUE, then the test is TRUE.

When you use several test expressions splitted by OR IF keywords, then they are evaluated from left to right until the first TRUE one is found, and then the test is TRUE. If all expressions are FALSE, then the test is FALSE.

You cannot mix AND IF and OR IF keywords on the same line.

Example
DIM k AS Integer

FOR k = 1 TO 10

  IF k < 5 OR IF k > 5 THEN
    PRINT k;;
  ELSE
    PRINT
    PRINT "5 has been reached!"
  END IF

NEXT

PRINT

1 2 3 4 5 has been reached! 6 7 8 9 10


See also
Test Control Structures & Functions