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+---- Thread: What's with "RUN" and "CLS"? (/showthread.php?tid=1381)
What's with "RUN" and "CLS"? - PhilOfPerth - 01-09-2023
Probably two of the simplest instructions, Run and Cls are confusing the hell out of me!
When I run this code:
Screen 1
Print "ABC"
Print "DEF"
_Delay 1
Print "XXX"
_Delay 1
Cls
Run
I would expect either the Cls, or the Run, to wipe the screen clean. According to Help, Run clears the current programme (and I assume this means its screen as well) but it doesn't!
So, I added the Cls, expecting that this, at least, would clear the screen, but it only cleans down to the first _Delay (or Sleep) line. Why does the text after _Delay not get wiped?
RE: What's with "RUN" and "CLS"? - SMcNeill - 01-09-2023
It *does* wipe the screen clear. You just so happen to write on it immediately after. Try this and watch.
Code: (Select All)
Screen 1
Print "ABC"
Print "DEF"
_Delay 1
Print "XXX"
_Delay 1
Cls
_Delay 4
RunRE: What's with "RUN" and "CLS"? - SMcNeill - 01-09-2023
Or, for an added thought exercise, let's take a look at what's going on with the code:
Screen 1
Print "ABC"
Print "DEF"
_Delay 1
Print "XXX"
_Delay 1
Cls
Run <--- at this point, we start over again. Right?
So isn't our code actually something like:
Code: (Select All)
Screen 1
Print "ABC"
Print "DEF"
_Delay 1
Print "XXX"
_Delay 1
Cls
Screen 1
Print "ABC"
Print "DEF"
_Delay 1
Print "XXX"
_Delay 1
Cls
Screen 1
Print "ABC"
Print "DEF"
_Delay 1
Print "XXX"
_Delay 1
Cls
Screen 1
Print "ABC"
Print "DEF"
_Delay 1
Print "XXX"
_Delay 1
Cls
Screen 1
Print "ABC"
Print "DEF"
_Delay 1
Print "XXX"
_Delay 1
Cls
....Make the issue a little more obvious now?
RE: What's with "RUN" and "CLS"? - PhilOfPerth - 01-09-2023
(01-09-2023, 04:17 AM)SMcNeill Wrote: Or, for an added thought exercise, let's take a look at what's going on with the code:Ahah, gotit! Thanks Steve.
Screen 1
Print "ABC"
Print "DEF"
_Delay 1
Print "XXX"
_Delay 1
Cls
Run <--- at this point, we start over again. Right?
So isn't our code actually something like:
Code: (Select All)Screen 1
Print "ABC"
Print "DEF"
_Delay 1
Print "XXX"
_Delay 1
Cls
Screen 1
Print "ABC"
Print "DEF"
_Delay 1
Print "XXX"
_Delay 1
Cls
Screen 1
Print "ABC"
Print "DEF"
_Delay 1
Print "XXX"
_Delay 1
Cls
Screen 1
Print "ABC"
Print "DEF"
_Delay 1
Print "XXX"
_Delay 1
Cls
Screen 1
Print "ABC"
Print "DEF"
_Delay 1
Print "XXX"
_Delay 1
Cls
....
Make the issue a little more obvious now?
Now I can move on to the *really* tricky ones, like If... Then... Else
