Another fundamental part of programming logic is the
ability to offer a choice of what to do that depends on the conditions asked of.
(I'm not sure that makes any sense...). The format is:
A D V E R T I S E M E N T
IF {identifier-1} {condition} {identifier-2 or literal} ...
THEN {statements}
[ELSE {statements}]
END-IF
An example:
IF X = Y
THEN
MOVE 1 TO Y-COUNTER
ELSE
MOVE 1 TO X-COUNTER
END-IF
ELSE is used if an alternative statement is to be executed if the first
condition is false. If there was only to be action if X = Y then the ELSE
would be ommitted.
The END-IF terminates the IF statement. All that lies
between IF and END-IF will depend on the conditions being tested.
Multiple conditions can be tested, i.e. IF (X = Y) AND (Y
< 100) THEN ..
The types of conditions available are described in the
following section..
