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Forum Index : Microcontroller and PC projects : MMBasic for Windows 5.07.03B24 notes

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electricat

Senior Member

Joined: 30/11/2020
Location: Lithuania
Posts: 288
Posted: 05:26am 24 Apr 2025
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Sorry boys, I feel ugly posting this as new thread.
Found in MMB4W 5.07.03B24. Not a bug, still developers might want to mark this as "to fix someday" for better code compat.


MID$(string$,patern$,1)=""


would throw:
>Error in line xx : Supplied string too short

But would accept to do the same

MID$(string$,patern$,1)=CHR$(0)
My MMBasic 'sand box'
 
dMajo

Newbie

Joined: 18/05/2020
Location: Italy
Posts: 27
Posted: 06:11am 24 Apr 2025
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In my opinion it could seems the same but it is not.
in the first case we have a zero lenght (no characters) string, while in the second example the chr$ function returns 1 character string even if of binary value 0.
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JohnS
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Joined: 18/11/2011
Location: United Kingdom
Posts: 3988
Posted: 06:29am 24 Apr 2025
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Looks like a bug.

John
 
electricat

Senior Member

Joined: 30/11/2020
Location: Lithuania
Posts: 288
Posted: 06:36am 24 Apr 2025
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  dMajo said  In my opinion it could seems the same but it is not.
in the first case we have a zero lenght (no characters) string, while in the second example the chr$ function returns 1 character string even if of binary value 0.


Yes.
Like I said it`s not a bug, but posted this, becouse Picomites in same situation would accept ="" and MMB4W (maybe) needs fix in some blurr future, for beter code compatibility. Thats it.
My MMBasic 'sand box'
 
CaptainBoing

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Joined: 07/09/2016
Location: United Kingdom
Posts: 2137
Posted: 09:57am 24 Apr 2025
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  electricat said  

MID$(string$,patern$,1)=""


would throw:
>Error in line xx : Supplied string too short

But would accept to do the same

MID$(string$,patern$,1)=CHR$(0)


in the first code example you say "substitute one character with this zero length string" Whether that makes sense or not is arguable (personally I don't have an issue with it and I can see it being useful), but it isn't allowed in MMB4W, therefore such discussion is moot.

Unless I am missing something, I would say things are "as designed".

h
Edited 2025-04-24 20:14 by CaptainBoing
 
matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10000
Posted: 10:05am 24 Apr 2025
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The PicoMite supports

S$="12345678"
mid$(s$,3,2)=""


as a perfectly valid way of removing characters from within a string. I haven't updated MMB4W with this new functionality - one day perhaps....
CMM2 is the same as PicoMite
Edited 2025-04-24 20:07 by matherp
 
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