I would like to do infinity loop like in JAVA   for(i=1;i<200;I++){        if (COL(i) != COL1 AND COL(i) != "  ") {                  q_person_type = "Multiple";        }        else {                 q_person_type = COL1         }                 }   For SAS Code   data test3(keep=q_full_nm q_person_type rename=(q_full_nm=node_tooltip));     set test2;     do i = 1 to n by 1;        q_person_type=COL1;        if COLi ne ' ' AND COLi ne COL1 then q_person_type="Multiple"; run;   I cannot run this code, could you please check it which part i'm wrong what i want is if COL2, COL3 ... until COL N is not equal to COL1 return "Multiple" but if COL2, COL3 .... until COL N is equal to COL1 or is "  " return COL1   Please see picture for more understanding ... View more