Question

Within DrJava, create a class called StudentQuizScores and do the following using a do-while loop.

1. You program will read in a student’s first name. The same will be done for the student’s last name. Your program will use respective methods (described below) to accomplish this.

2. Your program will then read in three quiz scores, respectively. This should be done by using the same method three times. This method is described below.

3. Your program will then calculate the average of these three quiz scores. This will be obtained from a method described below.

4. A string will be built that will have information about the student (the student name, the three quiz scores, and the average for these quiz scores). This string will be built within a particular method described below.

5. In the main method, your program should print this string to the console using a Scanner object (keyboard).

6. Your program should then generate a number between 1 and 3 (this can be done within the main method). Your program should use the Random object (randomNumbers) in the following manner: changeScore = randomNumbers.nextInt(3) + 1; Where changeScore is a variable that was declared in the main method. Using the newly generated number, determine which quiz score should be changed (you may use a switch statement or a series of if-else statements to determine this). Then call upon the proper method described below.

7. Again, your program will then calculate the average of these three quiz scores. This will be obtained from a method.

8. Again, a string will be built that will have information about the student (the student name, the three quiz scores, and the average for these quiz scores). This string will be built within a particular method described below.

9. Again, in the main method, your program should print this string to the console using a Scanner object (keyboard).

10.Finally, use a method to prompt the user to see if they wish to exit the program. Use the returned value from this method to determine whether your program should exit.

11.If the user does not want to exit the program, then repeat steps 1 through 10 for another student.

12.If the user does want to exit the program, then print out to the console “This program was written by ” and “End of program.” Both of these strings should be printed on separate lines.

13.Appropriate comments must be used in this program where applicable.

No prompting should be done within the main method. Rather they should be done within any respective method. Here are the methods that your program must use in your program.

All methods must be preceded by the keywords public static :

• String getFirstName() no parameters are received; will prompt the user for the student’s first name and then return the student's first name

• String getLastName() no parameters are received; will prompt the user for the student’s last name and then will return the student's last name

• int getScore() no parameters are received; will prompt the user for a student’s quiz score and then will return the quiz score (between the value of 0 and 100) • double getScoreAverage(int s1, int s2, int s3) will receive three integer parameters; will return the average of the three quiz scores

• String buildString(String fName, String lName, int s1, int s2, int s3, double avg) will receive six parameters; will return a string that will be built from these six parameters

• boolean exitProgram() no parameters are received; will return either the boolean value true or the boolean false depending on whether the user wants to exit the program

Note: in this method after you prompt the user and before you read in from the keyboard you should insert the following line: keyboard.nextLine(); This will pick up the leftover newline character that was left over from reading in the quiz scores.

• int newScore(int changeScore, int score) will receive two parameters (first parameter will determine which quiz score needs to be changed, the second parameter will be quiz score that will be changed); the new quiz score will be returned

A. Make sure that you import the classes Scanner and Random respectively, into your program For the Scanner object (call it keyboard) declare it as a class variable. Declare it above and outside the main method but still within the class.

It should look something like the following: public static Scanner keyboard = new Scanner (System.in);

For the Random object (call it randomNumbers), it should be declared within the main method and should look something like the following:

Random randomNumbers = new Random();

B. Do not forget to prompt the user where appropriate

Answer 1

import java.util.Random;
import java.util.Scanner;

public class QuizScoreSimulator {
  
private static Scanner keyboard;
  
public static void main(String[] args)
{
boolean yesNo;
do
{
String firstName = getFirstName();
String lastName = getLastName();
  
System.out.println("Enter score for 3 quizes:\n-------------------------");
int score1 = getScore();
int score2 = getScore();
int score3 = getScore();

double averageScore = getScoreAverage(score1, score2, score3);

System.out.println("\n" + buildString(firstName, lastName, score1, score2, score3, averageScore));

Random randomNumbers = new Random();
int changeScore;
do
{
changeScore = randomNumbers.nextInt(3) + 1;
}while(changeScore < 1 || changeScore > 3);

System.out.print("\nSystem randomly chose Quiz " + changeScore + " Score to change.\n"
+ "Enter the new score for Quiz " + changeScore + ": ");
int newScore = keyboard.nextInt();
switch(changeScore)
{
case 1:
score1 = newScore(changeScore, newScore);
averageScore = getScoreAverage(score1, score2, score3);
System.out.println("\nAfter changing Quiz 1 Score:\n" +
buildString(firstName, lastName, score1, score2, score3, averageScore));
break;

case 2:
score2 = newScore(changeScore, newScore);
averageScore = getScoreAverage(score1, score2, score3);
System.out.println("\nAfter changing Quiz 2 Score: \n" +
buildString(firstName, lastName, score1, score2, score3, averageScore));
break;

case 3:
score3 = newScore(changeScore, newScore);
averageScore = getScoreAverage(score1, score2, score3);
System.out.println("\nAfter changing Quiz 3 Score: \n" +
buildString(firstName, lastName, score1, score2, score3, averageScore));
break;
}
System.out.println();
yesNo = exitProgram();
System.out.println();
}while(!yesNo);
}
  
public static String getFirstName()
{
keyboard = new Scanner(System.in);
System.out.print("Enter student's first name: ");
String firstName = keyboard.nextLine();
return firstName;
}
  
public static String getLastName()
{
keyboard = new Scanner(System.in);
System.out.print("Enter student's last name: ");
String lastName = keyboard.nextLine();
return lastName;
}
  
public static int getScore()
{
keyboard = new Scanner(System.in);
int score = 0;
do
{
System.out.print("Enter quiz score: ");
score = keyboard.nextInt();
}while(score < 0 || score > 100);
return score;
}
  
public static double getScoreAverage(int s1, int s2, int s3)
{
return (double)(s1 + s2 + s3) / 3;
}
  
public static String buildString(String fName, String lName, int s1, int s2, int s3, double avg)
{
return ("First Name: " + fName + "\nLast Name: " + lName + "\nQuiz 1 Score: " + s1
+ "\nQuiz 2 Score: " + s2 + "\nQuiz 3 Score: " + s3
+ "\nAverage Score: " + String.format("%.2f", avg) + "\n");
}
  
public static boolean exitProgram()
{
System.out.print("Exit program? [y/n]: ");
keyboard.nextLine();
char yesNo = keyboard.nextLine().toLowerCase().charAt(0);
return yesNo == 'y';
}
  
public static int newScore(int changeScore, int score)
{
changeScore = score;
return changeScore;
}
}

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