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IF THEN ELSE

IF expr THEN statement [ELSE statement]

Evaluates the expression ‘expr’ and performs the THEN statement if it is true or skips to the next line if false. The optional ELSE statement is the reverse of the THEN test. This type of IF statement is all on one line.

See also:
ELSE
ELSEIF THEN
ENDIF
IF THEN GOTO
IF THEN ELSE ELSIF ENDIF

IF THEN GOTO

IF expr THEN GOTO linenbr | label

Evaluates the expression ‘expr’ and performs the THEN statement if it is true or skips to the next line if false. The optional ELSE statement is the reverse of the THEN test. This type of IF statement is all on one line.
The ‘THEN statement’ construct can be also replaced with:

GOTO linenumber | label

See also:
ELSE
ELSEIF THEN
ENDIF
IF THEN ELSE
IF THEN ELSE ELSIF ENDIF

IF THEN ELSE ELSEIF ENDIF

IF expression THEN
<statements>
[ELSE
<statements>]
[ELSEIF expression THEN
<statements>]
ENDIF

Multiline IF statement with optional ELSE and ELSEIF cases and ending with ENDIF. Each component is on a separate line.

Evaluates ‘expression’ and performs the statement(s) following THEN if the expression is true or optionally the statement(s) following the ELSE statement if false.

The ELSEIF statement (if present) is executed if the previous condition is false and it starts a new IF chain with further ELSE and/or ELSEIF statements as required.

One ENDIF is used to terminate the multiline IF.

See also:
ELSE
ELSEIF THEN
ENDIF
IF THEN ELSE
IF THEN GOTO