Write a full class definition for a class named counter, and containing the following members: a data member counter of type int. a constructor that takes one int argument and assigns its value to counter a function called increment that accepts no parameters and returns no value. increment adds one to the counter data member. a function called decrement that accepts no parameters and returns no value. decrement subtracts one from the counter data member. a function called getvalue that accepts no parameters. it returns the value of the instance variable counter.