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When you decide to stop the loop, assuming that you are working with a
typical version of the Unix or Dos operating systems, you can
arrange for the input expression to return 0, instead of the value
of cin, thus stopping the while loop, by typing the
appropriate keychord.
You are said to type a keychord whenever you hold down one key
while you press another. For example, if you are working with a
typical version of Unix, you tell the input operator to return
0 by holding down the control key and pressing the
d key, thereby typing the control-d keychord.