Description
Problem 1
Problem 1 consists of multiple parts. You should finish one part and ensure that it works before
moving to the next part. You will need to refactor (rewrite parts of) your code as you move
between parts. Only your final program will be graded.
Part 1
The use of computers in education is referred to as computer-assisted instruction (CAI). Write a program
that will help an elementary school student learn multiplication. Use a SecureRandom object to produce
two positive one-digit integers (you will need to look up how to do this). The program should then prompt
the user with a question, such as
How much is 6 times 7?
The student then inputs the answer. Next, the program checks the student’s answer. If it’s correct,
display the message “Very good!” and ask another multiplication question. If the answer is wrong,
display the message “No. Please try again.>again.” and let the student try the same question
repeatedly until the student finally gets it right. A separate method should be used to generate each new
question. This method should be called once when the application begins execution and each time the
user answers the question correctly.
Part 2
Modify the program from Part 1 so that various comments are displayed for each answer as follows:
Possible responses to a correct answer:
Very good!
Excellent!
Nice work!
Keep up the good work!
Possible responses to an incorrect answer:
2/22/22, 3:30 PM Programming Assignment 3 (IntelliJ)
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No. Please try again.
Wrong. Try once more.
Don’t give up!
No. Keep trying.
Use random-number generation to choose a number from 1 to 4 that will be used to select one of the
four appropriate responses to each correct or incorrect answer. Use a switch statement to issue the
responses.
Part 3
Modify the program from Part 2 to use your question generation method to ask the student 10 different
questions. Give students only one chance at answering each question. Count the number of correct and
incorrect responses typed by the student. After the program has asked 10 questions, and the student
types 10 answers, your program should calculate the percentage that are correct. If the percentage is
lower than 75%, display “Please ask your teacher for extra help.”, then reset the program so another
student can try it. If the percentage is 75% or higher, display “Congratulations, you are ready to go to the
next level!”, then reset the program so another student can try it.
Part 4
Modify the program from Part 3 to allow the user to enter a difficulty level. At a difficulty level of 1, the
program should use only single-digit numbers in the problems; at a difficulty level of 2, numbers as large
as two digits, and so on. Allow for four levels of difficulty.
Part 5
Modify the program from Part 4 to allow the user to pick a type of arithmetic problem to study. An option
of 1 means addition problems only, 2 means multiplication problems only, 3 means subtraction problems
only, 4 means division problems only and 5 means a random mixture of all these types.
Problem 2
Create class SavingsAccount. Use a static variable annualInterestRate to store the annual interest
rate for all account holders. Each object of the class contains a private instance variable
savingsBalance indicating the amount the saver currently has on deposit. Provide method
calculateMonthlyInterest to calculate the monthly interest by multiplying the savingsBalance by
2/22/22, 3:30 PM Programming Assignment 3 (IntelliJ)
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Assignment 3 Rubric (1)
annualInterestRate divided by 12—this interest should be added to savingsBalance. Provide a static
method modifyInterestRate that sets the annualInterestRate to a new value.
Write a program to test class SavingsAccount. Instantiate two SavingsAccount objects, saver1 and
saver2, with balances of $2000.00 and $3000.00, respectively. Set annualInterestRate to 4%, then
calculate the monthly interest for each of 12 months and print the new balances for both savers. Next,
set the annualInterestRate to 5%, calculate the next month’s interest and print the new balances for
both savers.
2/22/22, 3:30 PM Programming Assignment 3 (IntelliJ)
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Criteria Ratings Pts
1 pts
1 pts
1 pts
1 pts
1 pts
1 pts
1 pts
1 pts
1 pts
Problem 1: A SecureRandom object is used to generate random number 1 pts
Full
Marks
0 pts
No
Marks
Problem 1: Program displays randomly generated questions and prompts student for
answer
1 pts
Full
Marks
0 pts
No
Marks
Problem 1: Program stores student response in a double precision floating-point variable 1 pts
Full
Marks
0 pts
No
Marks
Problem 1: Program uses floating-point comparison to determine if the students answer is
correct
1 pts
Full
Marks
0 pts
No
Marks
Problem 1: Program displays the proper response message based on the correctness of
the student’s answer
1 pts
Full
Marks
0 pts
No
Marks
Problem 1: Program is able to display multiple positive and negative responses, based on
student correctness
1 pts
Full
Marks
0 pts
No
Marks
Problem 1: The specific response displayed to students is determined randomly from
within the proper set of responses
1 pts
Full
Marks
0 pts
No
Marks
Problem 1: Program shall run the user through 10 questions per session 1 pts
Full
Marks
0 pts
No
Marks
Problem 1: Program shall display the number of correct and incorrect responses at the
end of a session
1 pts
Full
Marks
0 pts
No
Marks
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Criteria Ratings Pts
1 pts
1 pts
1 pts
1 pts
1 pts
1 pts
1 pts
1 pts
2 pts
Problem 1: Program shall display a message indicating whether or not the student is
ready to advance at the end of a session
1 pts
Full
Marks
0 pts
No
Marks
Problem 1: Program shall ask the user if they wish to begin a new session once the
current session has terminated
1 pts
Full
Marks
0 pts
No
Marks
Problem 1: Program shall reset its state when a new session is started 1 pts
Full
Marks
0 pts
No
Marks
Problem 1: Program shall terminate when the user no longer wishes to start a new
session
1 pts
Full
Marks
0 pts
No
Marks
Problem 1: The first thing a student is prompted for when starting a session is a difficulty
level of 1, 2, 3, or 4
1 pts
Full
Marks
0 pts
No
Marks
Problem 1: The number of digits in each number of problem correspond to the difficulty
level (1 = 1 digit, 2 = 2 digit, 3 = 3 digit, 4 = 4 digit)
1 pts
Full
Marks
0 pts
No
Marks
Problem 1: The second thing a student is prompted for when starting a session is the type
of problem to be studied: 1, 2, 3, 4, or 5
1 pts
Full
Marks
0 pts
No
Marks
Problem 1: Problems presented to students during a session reflect the selected problem
type (1 is addition only, 2 is multiplication only, 3 is subtraction only, 4 is division only, and
5 is a mix of addition, subtraction, multiplication, and division.)
1 pts
Full
Marks
0 pts
No
Marks
Problem 1: A method is used to generate the questions 2 pts
Full
Marks
0 pts
No
Marks
2/22/22, 3:30 PM Programming Assignment 3 (IntelliJ)
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Criteria Ratings Pts
2 pts
2 pts
2 pts
5 pts
1 pts
1 pts
1 pts
1 pts
2 pts
Problem 1: A method is used to generate the response 2 pts
Full
Marks
0 pts
No
Marks
Problem 1: A method is used to determine the difficulty level 2 pts
Full
Marks
0 pts
No
Marks
Problem 1: A method is used to determine the problem type 2 pts
Full
Marks
0 pts
No
Marks
Problem 1: IntelliJ project is stored on GitHub 5 pts
Full
Marks
0 pts
No
Marks
Problem 2: Class named SavingsAccount exists 1 pts
Full
Marks
0 pts
No
Marks
Problem 2: annualInterestRate is a private class variable 1 pts
Full
Marks
0 pts
No
Marks
Problem 2: savingsBalance is a private instance variable 1 pts
Full
Marks
0 pts
No
Marks
Problem 2: calculateMonthlyInterest is a public instance method 1 pts
Full
Marks
0 pts
No
Marks
Problem 2: calculateMonthlyInterest is correctly implemented 2 pts
Full
Marks
0 pts
No
Marks
2/22/22, 3:30 PM Programming Assignment 3 (IntelliJ)
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Criteria Ratings Pts
1 pts
2 pts
1 pts
1 pts
1 pts
1 pts
1 pts
5 pts
1 pts
Problem 2: modifyInterestRate is a public class method 1 pts
Full
Marks
0 pts
No
Marks
Problem 2: modifyInterestRate is correctly implemented 2 pts
Full
Marks
0 pts
No
Marks
Problem 2: Test program instantiates two SavingsAccount objects 1 pts
Full
Marks
0 pts
No
Marks
Problem 2: Test program sets the annualInterestRate to 4% 1 pts
Full
Marks
0 pts
No
Marks
Problem 2: Test program calculates the monthly interest for each of the 12 months and
prints the balances for both SavingsAccount instances.
1 pts
Full
Marks
0 pts
No
Marks
Problem 2: Test program sets the annualInterestRate to 5% 1 pts
Full
Marks
0 pts
No
Marks
Problem 2: Test program calculates the monthly interest for the next month’s interest and
prints the balances for both SavingsAccount instances.
1 pts
Full
Marks
0 pts
No
Marks
Problem 2: IntelliJ project is stored on GitHub 5 pts
Full
Marks
0 pts
No
Marks
Problem 2: Test program is in a class called Application 1 pts
Full
Marks
0 pts
No
Marks
2/22/22, 3:30 PM Programming Assignment 3 (IntelliJ)
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Total Points: 50
Criteria Ratings Pts
