For loop bug - Socoder

-=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- (c) WidthPadding Industries 1987 0\|577\|0 -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=- -=+=-
Socoder -> JSE -> For loop bug
Sun, 13 Nov 2022, 05:10
Dan	For loop bug See the example: // For loop bug // by Dan // Created 2022/11/13 y=1 For x=y To 4 Print "This should execute: "+x+"/10" Next Print y=6 For x=y To 4 Print "This should not execute: "+x+"/10" Next Print For x=y To 4 Step -1 Print "This should execute: "+x+"/10" Next print For x=y To 8 Step -1 Print "This should not execute: "+x+"/10" Next --v
Sun, 13 Nov 2022, 05:23
Jayenkai	And I can tell you exactly why that happens, too. Every For-Next gets turned into a Repeat-Until by the parser. For x=y becomes x=y:Repeat. The code then extracts the "To ..." bit, and hunts for what it thinks is the connecting Next. There, it replaces the Next with x=x+"Step":Until x>y (or, if Step is a negative, replaces it with x<y) Because of this, it'll always do that first pass. I DO need to fix that, but the only real way I can think to do it, is to switch out the Repeat-Until for a While-Wend. That'd be MUCH better, but unfortunately I haven't yet done that, because trying to guesstimate which Wend connects to a While, so that it can jump to the Wend without passing through the middle, isn't something I've worked out in my head yet!!! (See also.. There's no While/Wend!!) When the code is running, it's easier to say Repeat: Until - Jump Back to the point in the stack... than it is to say While - Jump to the bit you haven't got to yet... If that makes sense..! I do need to fix this, though, it's been a bug since the very start. -=-=- ''Load, Next List!''