Flags: Difference between revisions
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These flags are always numbers which are binary | These flags are always numbers which are binary, literal values of which usually represented in hexadecimal (e.g. const FLAG = &H0001). E.g. for flags with binary values 0001 (&H0001), 0010 (&H0002), 0100 (&H0004) and 1000 (&H0008), we know that the flag value 1011 contains the 1st, 2nd and 4th flag. | ||
=== Use flags in Visual Basic or VBScript === | === Use flags in Visual Basic or VBScript === | ||
Latest revision as of 13:53, 7 September 2014
What's a flag in programming?
Flags in programming are like tags that can be added to a certain object: they're either present or not.
These flags are always numbers which are binary, literal values of which usually represented in hexadecimal (e.g. const FLAG = &H0001). E.g. for flags with binary values 0001 (&H0001), 0010 (&H0002), 0100 (&H0004) and 1000 (&H0008), we know that the flag value 1011 contains the 1st, 2nd and 4th flag.
Use flags in Visual Basic or VBScript
To add a flag, use OR (Or or +)
MyFlags = MyFlags Or FLAGTo remove a flag, use AND NOT (And Not)
MyFlags = MyFlags And (Not FLAG)To check for the presence of a flag, use AND (And)
If MyFlags And FLAG
' FLAG is present
End If