Instructions are attached. Thank you
C++ Programming: Polymorphism Assignment Instructions
The objective of this assignment is to give you some practice using inheritance, virtual functions, and polymorphism.With a focus on dynamic binding, this program shifts the focus from design time static binding of functions to objects to run-time (or dynamic binding).It leverages the use of virtual functions and introduces the concept of abstract and concrete classes in its implementation of pure virtual functions as it also demonstrates polymorphic behavior.
1. Create a base class called
. All insects belong to an
[i.e. “Hemiptera” (ants),“Siphonaptera” (fleas), “Termitoidae” (termites), “Gryllidae” (crickets), etc.] and have a
that is measured in millimeters (use a double data type). Provide a default constructor that initializes the size to zero and outputs the message “Invoking the default Insect constructor” and another constructor that allows the Order and size to be set by the client. This other constructor should also output the message “Invoking the 2-argument Insect constructor.”Also create a destructor for this class that outputs the message “Invoking the default Insect destructor.” Your Insect class should have a function called
that cannot be implemented.That is, it should be declared as a
function. Your class should also have Get and Set methods to allow the order and size to be accessed.
2. From the Insect class, derive Ant, Locust, Butterfly, and Termite classes. The derived classes should each have constructors and destructors that output an appropriate message (e.g., the Ant constructor outputs “Invoking Ant constructor,” and the Ant destructor outputs “Invoking Ant destructor”). The constructor of each derived class should allow the Order and size of the Insect to be set (think member initialization list). The derived classes should each have a member function called Eat that overrides the Insect Eat version. Ant Eat should output “As an ant, I eat everything,” Locust Eat should output “As a locust, I eat leaves,” Butterfly Eatshould output “As a butterfly, I eat nectar,” and Termite Eat should output “As a termite, I eat wood.”
3. Write a main function that uses the Insect and derived classes as needed to do the following. You must perform the actions below in the sequence described (i.e., do not take a shortcut around using dynamic memory allocation/deallocation and virtual methods since they are the whole point of the lab).
a. Use the rand() function in a formula to generate a random size in millimeters based on the insect selected.
The range of sizes for each insect are as follows:
.01 to 1.0 millimeters
10.5 to 50.0 millimeters
40.0 to 75.5 millimeters
1.5 to 5.5 millimeters
As a refresher on the rand() function, recall that it generates an integer between 0 and the largest integer that can be stored.If you don’t want the low end of the range to start at 0, you add a number to the rand() function that represents the smallest number in the range of numbers you want to generate.This is the
.Using the modulus operator (%), you can specify the
.For example, to generate a random number between 2.75 and 4.00, you can use this formula (note that since rand() generates an integer, I am multiplying the desired offset and interval by 100 and then dividing the final result by 100.0):
double randomNumber = ((rand() % interval ) + (offset))/100.0
randomNumber = ((rand() % (125+1)) + (275))/100.0
where 125 = 400-275
“1” is added to the 125 to make the range inclusive on the upper end.
for this assignment…
An alternative to using the rand() function is to use the uniform_real_distribution class, which is described in section 13-6 of your textbook.It’s actually much easier to use and more robust in terms of generating random numbers that are more random.The rand() function is somewhat predictable, but it’s still used in programs today.It’s always good to know both techniques, though.In this assignment, though, to receive credit for generating the random number, you
use the rand() function.
b. Your program should use a
value of 100 for the random number generator.You should set the seed only once at the beginning of main().Use the
() function to set the seed.
c. Prompt the user to make an Insect selection [e.g.(1) for Ant, (2) for Locust, (3) for Butterfly, and (4) for Termite] and to enter an Order for the insect. Dynamically create an Ant, Locust, Butterfly, or Termite object (depending on what the user entered) and initialize it with a constructor to which is passed its Order and size. Save the object (use an
array called “insects” – credit will not be awarded if you use a vector for this
).You may hardcode the size of the array to hold 3 elements.That is, you don’t need to dynamically create this array unless you want to.If you do dynamically allocate it, though, be sure to deallocate its memory properly.
d. Repeat steps a. and b. 2 more times. You do not know what insects the user will select or in what order, so you must figure out how to create and store the appropriate objects. Notice that there are 4 insects from which to choose, but the user will only make 3 selections.Therefore, one insect will not be chosen.
e. After the user has entered all 3 selections, execute another loop that cycles through the 3 selections and invokes the
function and also displays the Order and size of the insect. If you have done it properly, each of your outputs will correspond to the type of Insect the user selected in the order he or she entered them.
Your input screen should look something like this:
As each insect is selected, you should be prompted to enter the insect’s Order:
As each insect is created, you should see messages like the following:
Your final output screen shout look something like this:
· Complete the programming assignment described above and submit your completed assignment in accordance with the lab submission policies.
To give you an idea of the general criteria that will be used for grading, here is a checklist that you might find helpful:
Compiles and Executes without crashing
Word document contains screen shots and integrity statements
Appropriate internal documentation
No global variables
Code is modular
Appropriate Pre-processing and using directives
Member functions and variables are declared with appropriate protection (i.e. private or public)
Correct implementation of inheritance to enable polymorphism
Base Insect class
Correct Private Data Members
Constructors/destructor function appropriately (correct number of constructors, number ofarguments, output of messages, etc.)
Correct get and set functions
Derived Ant, Locust, Butterfly, and Termite classes
Correct Private Data Members
Constructors/destructors function appropriately (correct number of constructors, number ofarguments, output of messages, etc.)
Correct get and set functions
Eat function implementation and usage
Dynamic allocation of insects
Random generation of insect sizes
Output contains appropriate information
Array used to store 3 insects correctly
Memory is deallocated appropriately
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