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while(!<>) verses until($_=<>)

Posted on 2006-04-14
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Last Modified: 2010-03-05
(In "Gory Details")

Shouldn't these two whiles operate
identically?

  while(!<>) {
    print;        # echos ^Zs to the screen
  }

  until($_=<>) {
    print;        # echos only the newline
  }
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Question by:hank1
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ozo earned 200 total points
ID: 16455436
while( !($_=<>) ){
  print;
}
is like
 until($_=<>) {
    print;        # echos only the newline
 }
but not like
  while(!<>) {
    print;        # echos ^Zs to the screen
  }
which does not assign $_
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