Write the function definitions of the two constructors for the Period class as specified...

Write the function definitions of the two constructors for the Period class as specified in Exercise 7.

REF PRB:

Programming Problems 3 and 4 in Chapter 10 asked you to develop educational programs for teaching the periods of geologic time. Now that you know how to write classes, you can turn the Period ADT into a class. Write a specification file for class Period, which has a private field that’s an enumeration type, representing the names of the periods. Class Period should have functions that return the period as a string, that return the period as an int, that return the starting date of the period, and that increment the period to the next most recent period (if the period is already NEOGENE, the increment operation should do nothing). It should have a default constructor that sets the period to PRECAMBRIAN, and a constructor with a parameter of the enumeration type to allow the user to create a Period object containing any period. For ease of reference, the table of the time periods is repeated here from Chapter 10. Be sure to use appropriate documenting comments.