Define a class called Counter. An object of this class is
used to count things, so it records a count that is a nonnegative whole number.
Include methods to set the counter to 0, to increase the count by 1, and to
decrease the count by 1. Be sure that no method allows the value of the counter
to become negative. Also include an accessor method that returns the current
count value, as well as a method that displays the count on the screen. Do not
define an input method. The only method that can set the counter is the one
that sets it to zero.
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