Extended Basic - Is this a Syntax Error or an Interpreter Bug?

[kl99]

Hi Guys,

yesterday I have run into a nasty Syntax Error in Extended Basic, which also occurs in RXB.

I don't understand it and wonder if the line really contains a Syntax Error or this is a Interpreter Bug.

 

Version 1:

1 IF A=1 THEN 2 ELSE FOR I=1 TO 2 :: PRINT I :: NEXT I
2 END

Version 2:

1 IF A=1 THEN 2 :: FOR I=1 TO 2 :: PRINT I :: NEXT I
2 END

 

Both versions complain about a Syntax Error in Line 1.

 

I would like to analyze it with the help of you and maybe RXB can be even fixed.

Edited August 1, 2019 by kl99

[+Lee Stewart]

It is not a bug. The XB manual clearly states on page 95: “The IF-THEN-ELSE statement cannot contain DATA, DEF, DIM, FOR, NEXT,
OPTION BASE, SUB, or SUBEND.” 

 

...lee

[senior_falcon]

I ran into this in the 10 line programming challenge. I think TI was being overcautious. By turning off prescan in line 95 the following runs as expected. 

90 A=2 :: I=1
95 !@P-
100 IF A=1 THEN 200 ELSE FOR I=1 TO 2 :: PRINT I :: NEXT I
200 PRINT "LINE 200"

But it's easy enough to fix this by breaking up the line:

100 IF A=1 THEN 200 
110 FOR I=1 TO 2 :: PRINT I :: NEXT I
200 PRINT "LINE 200"