Calling a Macro in a loop?

Question

Here is a simple SAS program I created ...

%MACRO SCANLOOP();
    %DO I=1 %TO 5; 
        %put &I;
    %END;
%MEND;

%MACRO TEST();
    %DO I=1 %TO 3; 
        %SCANLOOP();    
    %END;
%MEND;

%TEST();
RUN;

I was expecting this SAS code to produce the following output:

but instead I just got ...

Can anyone explain to me why?

Thanks

Brian

Tom · Accepted Answer · 2015-10-07 11:35:26Z

2

You need to define your macro variables as LOCAL. Otherwise SAS will use the existing macro variable with the same name in the outer scope. For your particular example you must make I local in the SCANLOOP macro. But you should really do it in both.

%MACRO SCANLOOP();
  %LOCAL I;
  %DO I=1 %TO 5; 
    %put &I;
  %END;
%MEND;

answered Oct 7, 2015 at 11:35

Tom

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Comments

user1094779 · Accepted Answer · 2015-10-06 23:41:47Z

1

Oh those variables are not scoped the way I expected. If I change the variable in the first macro from I to J then it works.

answered Oct 6, 2015 at 23:41

user1094779

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