%macro multcond(dsname);
  %local rc dsid exist nlobs readpw;
  %let rc=1;
  %let dsid=0;
  %let exist=%sysfunc(exist(&dsname));
  %if &exist=0 %then %goto setrc;
  %let dsid=%sysfunc(open(&dsname,i));
  %if &dsid le 0 %then %goto setrc;
  %let nlobs=%sysfunc(attrn(&dsid,nlobs));
  %if &nlobs le 0 %then %goto setrc;
  %let readpw=%sysfunc(attrn(&dsid,readpw));
  %if &readpw=1 %then %goto setrc;

  %goto exit;
  %setrc:
  %let rc=0;
  %exit:
  %if &dsid ne %then %let closerc=%sysfunc(close(&dsid));
  %sysfunc(putn(&rc,1))
%mend;

%macro listsample(dsname);
  %if %multcond(&dsname)=1 %then %do;
    proc print data=&dsname(obs=10);
          title "First 10 Observations of &dsname";
        run;
%end;
%else %put error:***data set &dsname cannot be listed.;
%mend listsample;

%listsample(books.ytdsales)
%listsample(books.ytdsaless)

这段程序在multcond宏中的%mend前一句  %sysfunc(putn(&rc,1))后面加了分号为什么就得不到想要的结果。为什么不加分号