§IF <expression> THEN <statements> [ELSE <statements>]
Also IF <expression> GOTO <line>.
§Purpose
Do something contingent on a predicate.
Statements may omit the word GOTO.
§Example
10 A=10
20 IF A<30 THEN PRINT A:GOSUB 100:GOTO 20
90 END
100 A=A+10:RETURN
RUN
10
20