Java programming First, create a method to grade the student exams - gradeExams(

Question

Java programming

First, create a method to grade the student exams - gradeExams(). It takes 2 parameters: the answer key (single dimensional array) and the student answers (two dimensional array); displays the results; no return value (void). It should invoke a second method – gradeExam() that takes 2 parameters: the answer key (single dimensional array) and a single dimensional array for a single student’s answers; displays the results; no return value (void).

Once this works, create 2 more methods: getAnswerKey() and getStudentAnswers() which prompt the user for the corresponding information. getAnswerKey() returns a single dimensional array and getStudentAnswers() returns a two dimensional array. Note: getStudentAnswers() should take a single parameter specifying the number of questions (you can determine the value by looking at the array returned by getAnswerKey() ) – use this value to check that the user entered the correct number of answers for each student. Use your gradeExams() method to grade the user-supplied info.

Explanation / Answer

Below is your program: -

Assignment.java

import java.util.Scanner;

public class Assignment {
   static int count = 0;
   public static void main(String[] args) {
       char[] answerKey = getAnswerKey();
       char[][] studentAnswers = getStudentAnswers(answerKey.length);
       gradeExams(answerKey, studentAnswers);
       System.exit(0);
   }

   private static char[] getAnswerKey() {
       Scanner scanner = new Scanner(System.in);
       // Prompts user to input answer key
       System.out.println("Enter the answer key: ");
       String answerKey = scanner.nextLine();
       // Returns answer key as an array
       return answerKey.toCharArray();
   }

   private static char[][] getStudentAnswers(int numOfQuestions) {
       Scanner scanner = new Scanner(System.in);
       // Prompts user to input number of students
       System.out.println("Enter number of students: ");
       int numOfStudents = Integer.parseInt(scanner.nextLine());
       // Creates multidimensional array for student answers
       char[][] studentAnswers = new char[numOfStudents][numOfQuestions];

       // Prompts user to input students' answers
       for (int j = 0; j < numOfStudents; j++) {
           System.out.println("Enter student " + (j + 1) + "'s answers: ");
           String answers = scanner.nextLine();
           studentAnswers[j] = answers.toCharArray();
       }
       return studentAnswers;
   }

   private static void gradeExams(char[] answerKey, char[][] studentAnswers) {
       // Calculations for grading each students' exams
       for (int i = 0; i < studentAnswers.length; i++) {
           count++;
           gradeExams(answerKey, studentAnswers[i]);
       }
   }

   private static void gradeExams(char[] answerKey, char[] studentAnswers) {
       // Calculations for grading one student's exams
       int correctCount = 0;
       for (int i = 0; i < answerKey.length; i++) {
           if (studentAnswers[i] == answerKey[i])
               correctCount++;
       }
       System.out.println("For the student "+count +" correct count is " + correctCount + ".");
   }
}

Sample Run:-

Enter the answer key:
AABBCC
Enter number of students:
4
Enter student 1's answers:
ACBACB
Enter student 2's answers:
ABABAB
Enter student 3's answers:
ACACAC
Enter student 4's answers:
CBCBCB
For the student 1 correct count is 3.
For the student 2 correct count is 2.
For the student 3 correct count is 2.
For the student 4 correct count is 2.

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