相关问题：如果这个数据有2个字符变量，5个数字变量，产生一下宏变量：“llccccc”。“l”的个数是由字符变量的个数决定的，而“c”的个数是由数字变量的个数来决定的。如何实现？

data have;
input v1-v9;
cards;
1 1 1 1 1 1 1 1 1
;
run;
proc contents data=have out=out noprint;run;
data _null_;
set out end=eof;
if eof then call symput ('num',varnum);
run;
%put #
data c;
c='c';
do i=1 to #
output;
end;
run;
proc sql noprint;select c into:c separated by '' from c;quit;
%put &c;

仅供参考

data have;
input v1 $ v2 $ v3 $ v4-v6 v7 $ v8-v10;
cards;
a b c 1 1 1 d 1 1 1
;
run;
proc contents data=have out=out noprint;run;
data var1 var2;
set out;
if type=1 then output var1;
else output var2;
run;
data var1;
set var1 end=eof;
n=_n_;
if eof then call symput ('numn',n);
run;
data var2;
set var2 end=eof;
n=_n_;
if eof then call symput ('numc',n);
run;
%put numn=&numn numc=&numc;
data c;
var='c';
do i=1 to &numn;
output;
end;
run;
data l;
var='l';
do i=1 to &numc;
output;
end;
run;
data t;
set l c;
run;
proc sql noprint;select var into:t separated by '' from t;quit;
%put &t;

仅供参考

你这段似乎有问题，出来的是'lcccccl', 不是'llccccc'。