Comments and Examples
A multiple-line IF structure is initiated when the IF statement ends with an open-ended THEN or ELSE clause. (The term "open-ended" denotes a keyword that is not followed by an instruction until the next line.)
There are two ways to terminate a multiple-line IF:
- a.) with a single-lined ELSE statement
- b.) with an END IF statement.
The following example shows a multi-lined IF which is initiated with an open-ended THEN clause and which is terminated with a single-lined ELSE statement:
00010 IF X=2 THEN !:Initiates the multiple-line IF 00020 Y=1!: THEN instructions begin 00030 FOR Z=1 TO 10 00040 X$(Z)="" 00041 50 NEXT Z 00060 ELSE Y=0 !: Terminates the multiple-line IF
The following example shows a multi-lined IF which is initiated with an open-ended ELSE clause and which is terminated with an END IF statement:
00010 IF X=2 THEN Y=1 ELSE !:! Initiates the multi-line IF 00020 Y=0 00030 FOR Z=1 TO 10 00040 X$(Z)="" 00050 NEXT Z !:!ELSE instructions end 00060 END IF !:! Multi-line IF terminated
1.) IF nesting is allowed in multi-lined IF structures only. Nested multi-lined IFs are terminated in reverse order. 2.)Required to terminate a multi-line IF structure.