>we can 'Use' a variable with/without declaration.
>
>e.g. we can:
>
>abc = dtos(date())
>Messagebox(abc)
>
>
or>
>Local abc
>abc = dtos(date())
>Messagebox(abc)
>
>
or>
>Local abc
>abc = dtos(date())
>Messagebox(m.abc)
>
>
>
>What is the different between abc and m.abc?!
Nothing, as long as you don't have a field with the name 'abc'. The 'm.' qualifier instructs VFP to use the memory variable in prference to a field with the same name in the currently selected work area; VFP's default behavior is to resolve to the field name rather than the memory variable if both a field in the currently selected table and a variable have the same name.
>What is the different on Declare Local or Not?!
Scoping of the variable. Variables declared as
LOCAL are not visible outside of the procedure, function or method that they are declared in (unless passed by reference, in which case the PARAMETER or LPARAMETER statement provides access); undeclared variable references, or variables declared as
PRIVATE, are visible to procedures and functions called from the procedure in which the variable is created.
>
>
>
>For my observe, if using recusion without Local declaration,
>problem will come out!
>
>setAllFonts()
>Lparameters SetObject, nFontsize
>
>For iX = 1 to SetObject.Controlcount
> if Pemstatus(SetObject.controls[iX], "Fontsize", 5)
> SetObject.controls[iX].fontsize = nFontsize
> endif
>
> if Pemstatus(SetObject.controls[iX], "Controlcount", 5)
> SetAllFonts(Object.controls[iX], nfontsize)
> endif
>EndFor
>
>The problem comes in inner recusion as the iX variable will reset to 1 again but afterwards, when back to outer loop.
>the iX variable may smaller than previous value!
>
>This is because the variable still not out of scope!
>but there will work fine if there is line:
>
>Local iX && in the prg file! ^_^;
>
>
>
>Another thing on Macros,
>
>abc = Dtos(Date())
>what are different on:
>
>abc, (abc), &abc, (&abc), and also "&abc"
abc is the variable itself
(abc) in a name reference resolves to the name contained in the variable abc
&abc macro-expands the variable abc
(&abc) resolves the name formed by the string resulting from macro-expanding abc
"&abc" quote-encapsultes the macro expansion of abc
>
>which should be used on value!?
MyProperty.value = abc
