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