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Forum Index : Microcontroller and PC projects : CMM2: difficulty with MID$

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capsikin
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Joined: 30/06/2020
Location: Australia
Posts: 341
Posted: 10:37am 30 Aug 2020
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This test program crashes when I try to set the last character in the string. I can't see anything I'm doing wrong.


option base 1
dim s$
s$="123"
print s$
mid$(s$,1,1)="."
print s$
mid$(s$,2,1)="."
print s$
mid$(s$,3,1)="."
print s$
 
matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10055
Posted: 10:51am 30 Aug 2020
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I doesn't crash it just gives an incorrect error  
 
Chopperp

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Joined: 03/01/2018
Location: Australia
Posts: 1090
Posted: 11:20am 30 Aug 2020
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Try these


s$ = "123"
s$ = left$(s$,2) + "."
print s$

12.

s$ = "123"
s$ = left$(s$,1) + "." + right$(s$,1)
print s$

1.3

s$ = "123"
s$ = S$ + "."
print s$

123.



BTW I think matherp was hinting that you should check the usage of MID$.
Edited 2020-08-30 21:41 by Chopperp
ChopperP
 
capsikin
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Joined: 30/06/2020
Location: Australia
Posts: 341
Posted: 02:08pm 30 Aug 2020
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  Chopperp said  Try these


s$ = "123"
s$ = left$(s$,2) + "."
print s$

12.

s$ = "123"
s$ = left$(s$,1) + "." + right$(s$,1)
print s$

1.3

s$ = "123"
s$ = S$ + "."
print s$

123.



BTW I think matherp was hinting that you should check the usage of MID$.


I guess I'll reread it in case I missed something.

From the manual:
  Quote  
MID$( str$, start [, num]) = str2$

The characters in 'str$', beginning at position 'start', are replaced by the characters in 'str2$'. The optional 'num' refers to the number of characters from 'str2' that are used in the replacement. If 'num' is omitted, all of 'str2' is used. Whether 'num' is omitted or included, the replacement of characters never goes beyond the original length of 'str$'.


so in my use, the characters in s$ (initially "123", and "..3" by the time of the last change) beginning at position 3, are replaced by the characters in ".". 1 character from "." is used in the replacement. Looks correct.

Did you see there's a command version as well as a function version?

  matherp said  I doesn't crash it just gives an incorrect error  


I think I might understand the distinction you're making. But I don't know if you mean it shouldn't give an error or should give a different error.
 
matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10055
Posted: 03:15pm 30 Aug 2020
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  Quote  But I don't know if you mean it shouldn't give an error or should give a different error.


It was a bug in the error checking - fixed in the 5.05.05 version Geoff has just uploaded
 
capsikin
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Joined: 30/06/2020
Location: Australia
Posts: 341
Posted: 03:22pm 30 Aug 2020
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Excellent!
 
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