没人解答...自顶

Yes, it does. See log below.

140  proc iml;
NOTE: IML Ready
141  i=5;
142  do while (i=5);
143     i=i-1;
144     print i;
145  end;
146
147  do until (i=5);
148     i=i+1;
149     print i;
150  end;
151
152  quit;
NOTE: Exiting IML.
NOTE: PROCEDURE IML used (Total process time):
      real time           0.01 seconds
      cpu time            0.00 seconds