How .AND. and .OR. are evaluated?

[jbanaszczyk]

I have a short question.

How logical operators are evaluated? Does evaluation stops when the result is known (like && in C)? Or whole expression is evaluated?
From left to right?

(it could be checked with two user defined functions, but unfortunately now I have no access to full TCC)

best regards.

 

[AnrDaemon]

Hint: @EXECSTR…

 

[rconn]

The parser has to evaluate the entire line. Only the DWIM parser knows what combination of operators you might tack on at the end of the line ...

 

[jbanaszczyk]

@AnrDaemon - thanks

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@rconn: Hmm. I'm not asking for artificial intelligence

Set fName=C:\xyz
If "%@Left[2,%fName]" == "D:" .AND. exist %fName BlahBlah

can be written as

Set fName=C:\xyz
If "%@Left[2,%fName]" == "D:" If exist %fName BlahBlah

In the second case filesystem will not be checked.