Overview:

File Preview d half of program$1,$ you will modify your Overnight and TwoDay classes created in

Program$1$A to inherit from a new base class called Package. As before, all class and function names will

be exactly as specified here, case included. You will now be submitting $.$cpp and $.$h files for $3$ classes, for

a total of $6$ files. You will write your own test driver to exercise and test these classes, but you will not

submit the test driver to me; I will have my own that your classes must compile and link with.

Fix any comments or errors cited by me on Program $1$A but realize that you may not receive them until

the Tuesday before $1B$ is due.

Modify the Overnight and TwoDay classes to inherit from Package. Some of the data and functions that

previously resided in both the Overnight and TwoDay classes will be moved to the Package class. Others

that pertain specifically to their particular type will remain with the individual derived classes. Still others

will override the base class version.

Changes include $($but are not limited to$)$:

The use of constants to hold default values to be provided in the constructors or setters when

none $($or none valid$)$ is provided by the calling code. Check the style guide for the naming

convention of these constants.

The use of protected functions that can only be accessed by the derived classes $-$ not the calling

code.

The practice of derived classes overriding a function that the base class contains.

The practice of derived classes having an overload of a base class function that calls the base

class within.

The user of your software will be my test driver and the classes will not issue any output or request any

input $-$ except for the outputs specified in these requirements. Anything the test driver needs to know

will be asked in the form of calling a class function. It is the test driver's $($mine$)$ responsibility to print

data to the screen.

The cost of packages is now handled by each class. The base Package computes the base price of number

of ounces multiplied by the cost per ounce. As before, the TwoDay class adds a flat fee to that and

Oe it from scratch themselves.Overview:

File Preview d half of program$1,$ you will modify your Overnight and TwoDay classes created in

Program$1$A to inherit from a new base class called Package. As before, all class and function names will

be exactly as specified here, case included. You will now be submitting $.$cpp and $.$h files for $3$ classes, for

a total of $6$ files. You will write your own test driver to exercise and test these classes, but you will not

submit the test driver to me; I will have my own that your classes must compile and link with.

Fix any comments or errors cited by me on Program $1$A but realize that you may not receive them until

the Tuesday before $1B$ is due.

Modify the Overnight and TwoDay classes to inherit from Package. Some of the data and functions that

previously resided in both the Overnight and TwoDay classes will be moved to the Package class. Others

that pertain specifically to their particular type will remain with the individual derived classes. Still others

will override the base class version.

Changes include $($but are not limited to$)$:

The use of constants to hold default values to be provided in the constructors or setters when

none $($or none valid$)$ is provided by the calling code. Check the style guide for the naming

convention of these constants.

The use of protected functions that can only be accessed by the derived classes $-$ not the calling

code.

The practice of derived classes overriding a function that the base class contains.

The practice of derived classes having an overload of a base class function that calls the base

class within.

The user of your software will be my test driver and the classes will not issue any output or request any

input $-$ except for the outputs specified in these requirements. Anything the test driver needs to know

will be asked in the form of calling a class function. It is the test driver's $($mine$)$ responsibility to print

data to the screen.

The cost of packages is now handled by each class. The base Package computes the base price of number

of ounces multiplied by the cost per ounce. As before, the TwoDay class adds a flat fee to that and

Overnight instead adds extra cost per ounce. The derived classes may call the base computation function

or compute it from scratch themselves.

Perform any error checking that might be necessary with arguments to functions or calculations made.

Also be sure to go by the style guidelines published in the "Programming Assignments" folder in Canvas.

Perform any error checking that might be necessary with arguments to functions or calculations made.

Also be sure to go by the style guidelines published in the "Programming Assignments" folder in Canvas.