If i have the above macros, why did the &name statement used the ampersand & but not %, please help. Thanks.
because name is a macro variable. You have to use & when you use a macro variable.
does it mean that name must be userdefined?
I don't full understand what you mean by "must be userdefined". There are different ways to assign value to macro variable name.
one way is
hi, yes i understand that part, my question is why use this ampersand & in name again
without "&" SAS does not know "name" is a macro variable.
ok thank you very much