understanding macros

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Occasional Contributor
Posts: 11

understanding macros

  • %if &name=GEORGE %then %let lastname=smith;

If i have the above macros, why did the &name statement used the ampersand & but not %, please help. Thanks.

Super Contributor
Posts: 1,636

Re: understanding macros

because name is a macro variable. You have to use & when you use a macro variable.

Occasional Contributor
Posts: 11

Re: understanding macros

does it mean that name must be userdefined?

Super Contributor
Posts: 1,636

Re: understanding macros

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

%let name=GEORGE;

Occasional Contributor
Posts: 11

Re: understanding macros

hi, yes i understand that part, my question is why use this ampersand & in name again

Super Contributor
Posts: 1,636

Re: understanding macros

without "&" SAS does not know "name" is a macro variable.

Occasional Contributor
Posts: 11

Re: understanding macros

ok thank you very much

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