%macro prtlast;
%if &syslast ne _NULL_ %then %do;
proc print data=&syslast(obs=5);
title "Listing of &syslast data set";
run;
%end;
%else
%put No data set has been created yet.;
%mend;
proc sort data=sasuser.courses out=bydays;
by days;
run;
%prtlast
During execution, macro PRTLAST will be replaced by:
if &syslast ne _NULL_ then do;
proc print data=&syslast(obs=5);
title "Listing of &syslast data set";
run;
end;
else
put No data set has been created yet.;
SO: 可以不加分号. If you did add the semicolon, it doesn't matter. Just like: put No data set has been created yet.;;
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