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hamedhamedi
Joined: 12 Feb 2012
Posts: 70
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 Posted: Fri Dec 05, 2014 6:06 pm Post subject: preference of logical operation in bascom avr |
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Hi
i want to know wich of operation is claculate in basic first?
and or not?
for example when i write the code:
| Code: | if a>b and c<d or f>g and g<d then set status_bit
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which operation calculate first and which one second?
(BASCOM-AVR version : 2.0.7.7 ) |
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i.dobson
Joined: 05 Jan 2006
Posts: 1537
Location: Basel, Switzerland
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| Posted: Fri Dec 05, 2014 6:26 pm Post subject: |
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Hi,
Why not use brackets () to make it clearer for you and the Compiler:-
so do you mean:
if (a>b and c<d) or (f>g and g<d) then set status_bit
or maybe
if a>b and (c<d or f>g) and g<d then set status_bit
use brackets to group the conditions you want to combine
Regards
Ian Dobson
_________________
Home of AVRTimer, the Bascom timer value calculator.
http://www.planet-ian.com
Walking on water and writing software to specification is easy if they're frozen. |
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hamedhamedi
Joined: 12 Feb 2012
Posts: 70
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| Posted: Fri Dec 05, 2014 7:29 pm Post subject: |
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Hi
i test brackets (), it dont work on bascom! |
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i.dobson
Joined: 05 Jan 2006
Posts: 1537
Location: Basel, Switzerland
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| Posted: Fri Dec 05, 2014 7:41 pm Post subject: |
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Hi,
Oh sorry, I though that worked in Bascom. Looks as if I've spent far to much time programming in other languages in the last few months.
Regards
Ian Dobson
_________________
Home of AVRTimer, the Bascom timer value calculator.
http://www.planet-ian.com
Walking on water and writing software to specification is easy if they're frozen. |
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hamedhamedi
Joined: 12 Feb 2012
Posts: 70
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| Posted: Fri Dec 05, 2014 8:18 pm Post subject: |
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| so what can i do? |
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i.dobson
Joined: 05 Jan 2006
Posts: 1537
Location: Basel, Switzerland
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| Posted: Fri Dec 05, 2014 8:58 pm Post subject: |
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Hi,
The only Thing I can think of is split the IF into several if's that set a variable, that you later use something like
| Code: |
Result=0
if A > 0 and B > 0 then
Result=1
endif
if Result=0 and C>0 and D>0 then
Result=1
endif
if Result = 1 then
Do something
endif
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Not nice, but atleast it's obvious what the code does. Another way would be to use else to handle the or, something like
| Code: |
Result=0
if A > 0 and B > 0 then
Result=1
else
if C>0 and D>0 then
Result=1
endif
if Result = 1 then
Do something
endif
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Regards
Ian Dobson
_________________
Home of AVRTimer, the Bascom timer value calculator.
http://www.planet-ian.com
Walking on water and writing software to specification is easy if they're frozen. |
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EDC
Joined: 26 Mar 2014
Posts: 706
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| Posted: Fri Dec 05, 2014 9:57 pm Post subject: |
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Question was "what is first and what is second"
I always think that is simple but I test this in simulator (run LCD also)
| Code: | $sim
$regfile = "m32def.dat"
Dim A As Byte , B As Byte , C As Byte , D As Byte , F As Byte , G As Byte
Dim Status_bit As Bit
A = 1
B = 1
C = 1
D = 2
F = 2
G = 1
If A > B And C < D Or F > G And G < D Then Set Status_bit
Cls
Lcd Status_bit
End
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Or is tested at the end
This work too
| Code: | $sim
$regfile = "m32def.dat"
Dim A As Byte , B As Byte , C As Byte , D As Byte , F As Byte , G As Byte
Dim Status_bit As Bit
A = 1
B = 1
C = 1
D = 2
F = 2
G = 1
If A > B Then
If C < D Then Set Status_bit
Elseif F > G Then
If G < D Then Set Status_bit
End If
'If A > B And C < D Or F > G And G < D Then Set Status_bit
Cls
Lcd Status_bit
End |
With IF`s code is 16 bytes smaller  I test this (without lcd routines) |
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