Write the implementation (.cpp file) of the Counter class from the previous exercise. Here is the full specification of the class:
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 to the counter data member.
A function called getValue that accepts no parameters. It returns the value of the instance variable counter.