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Forum Index : Microcontroller and PC projects : MMBasic valid criteria

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OA47

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Joined: 11/04/2012
Location: Australia
Posts: 1013
Posted: 05:54am 22 Dec 2022
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Is this type of expression valid in MMBasic:
IF 0 <= Variable <= 10 Then

?????????????
OA47
 
TassyJim

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Joined: 07/08/2011
Location: Australia
Posts: 6363
Posted: 06:07am 22 Dec 2022
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No
If you try you will get caught up in comparing the result of a comparison with the other value/expression.
If (0 <= variable) and (variable <= 10)
I am not sure if the brackets are required. I did experiment with that some time ago. Too many electrons flowed under the bridge since then...

You could do a function if there are a few to do,

Jim
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OA47

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Joined: 11/04/2012
Location: Australia
Posts: 1013
Posted: 06:31am 22 Dec 2022
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Thanks Jim. The program was accepting the code (I am not sure which variation of Basic I got it from) but I was getting unpredictable outcomes.
Merry Christmas
OA47
 
CaptainBoing

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Joined: 07/09/2016
Location: United Kingdom
Posts: 2171
Posted: 09:02am 22 Dec 2022
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select/case might be a fit for you - it has a close enough syntax to what you give above:

Select Case x
  Case 0 To 10
     ...
End Select

bit long-winded if you are doing just a single comparison tho'

also, consider Constrain(), that might fit what you are doing.

h
 
toml_12953
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Joined: 13/02/2015
Location: United States
Posts: 488
Posted: 03:16pm 22 Dec 2022
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  OA47 said  Is this type of expression valid in MMBasic:
IF 0 <= Variable <= 10 Then

?????????????
OA47


In many BASICs, the first part (0 <= Variable) will return a -1 if variable >=0 and a 0 if variable <0.
Then it will compare that result with 10.

Since both 0 and -1 are <=10 the branch will always be taken
Edited 2022-12-23 01:20 by toml_12953
 
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