>Hi,
>Is constant evaluated only during compile time?
>


it is not an evaluation process, but a simple "string replacement", at compile time only.
you can see it with [] string

#DEFINE   APPFOLDER      "C:\myproject\"
#DEFINE   MYPRGFOLDER    APPFOLDER + "PRGS"

? [MYPRGFOLDER]     && Show "C:\myproject\" + "PRGS"

>At first, I hardcoded my application folder as constant.
>
>

>#DEFINE   APPFOLDER      "C:\myproject\"
>#DEFINE   MYPRGFOLDER    APPFOLDER + "PRGS"
>
>?MYPRGFOLDER     && Show C:\myproject\PRGS
>

>
>Then, I changed my code to allow user to specify app folder during runtime. So I changed code as below.
>
>

>**#DEFINE   APPFOLDER      "C:\myproject\"
>#DEFINE   MYPRGFOLDER    APPFOLDER + "PRGS"
>
>LOCAL APPFOLDER
>
>APPFOLDER = ADDBS(GETDIR())    && User select "C:\MYPROJECT2\"
>?MYPRGFOLDER     && It shows C:\myproject2\PRGS too!!!!
>

>
>I was thinking constant only been evaluated during compile time.
>
>Please advice.