/* this is a good example using array, do-loop and if-then */

data test;
input A $ B $ C $;
datalines;
0 0 JingWai
GuoYou 0 0
0 JingWai 0
GuoYou 0 0
0 JingWai 0
;
run;

/* this is a standard example of array and do-loop */
data want1;  
    set test;
        array myarray{3} a b c;
        do i = 1 to dim(myarray);
       if myarray(i) ^="0" then d = myarray(i);
        end;
        drop i;
run;

/* This is an example of using do-OVER loop with array and if-then */
data want2;   
   set test;
   array Use_Over a b c;   
   do over Use_Over;
   if Use_Over ^="0" then d2 = Use_Over;
   end;
run;


proc print data=want1; run;
proc print data=want2; run;

that is a very basic question

我是sas小白，望指点，不胜感激

我不想说

好吧，不勉强