
Concept explainers
Define a class for a type called CounterType. An object of this type is used to count things, so it records a count that is a nonnegative whole number. Include a default constructor that sets the counter to zero and a constructor with one argument that sets the counter to the value specified by its argument. Include member functions to increase the count by 1 and to decrease the count by 1. Be sure that no member function allows the value of the counter to become negative. Also, include a member function that returns the current count value and one that outputs the count to a stream. The member function for doing output will have one formal parameter of type ostream for the output stream that receives the output. Embed your class definition in a test

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