data a;
n=0;
do until(n ge 5);
put n=;
n+1;
end;
run;
data a;
n=0;
do while(n lt 5);
put n=;
n+1;
end;
run;
求上述两个程序的意思及区别？n ge 5和n lt 5是什么意思？多谢大神指点！