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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. public class Main {
  9.     public static void main(String[] args) {
  10.         char[][] answers = getStudentsAnswers();
  11.         int[][] result = gradeStudentsAnswers(answers);
  12.         announceResult(result);
  13.     }
  14.  
  15.     /**
  16.      * get students' answers for 10 multiple choice questions
  17.      * @return student's answers for 10 MCQs
  18.      */
  19.     private static char[][] getStudentsAnswers() {
  20.         char[][] answers = {
  21.                 {'A', 'B', 'A', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},
  22.                 {'D', 'B', 'A', 'B', 'C', 'A', 'E', 'E', 'A', 'D'},
  23.                 {'E', 'D', 'D', 'A', 'C', 'B', 'E', 'E', 'A', 'D'},
  24.                 {'C', 'B', 'A', 'E', 'D', 'C', 'E', 'E', 'A', 'D'},
  25.                 {'A', 'B', 'D', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},
  26.                 {'B', 'B', 'E', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},
  27.                 {'B', 'B', 'A', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},
  28.                 {'E', 'B', 'E', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},
  29.         };
  30.  
  31.         return answers;
  32.     }
  33.  
  34.     /**
  35.      * grade students on the basis of number of correct answers
  36.      * @param answers student's responses for MCQs
  37.      * @return a descending list based on number of correct responses
  38.      */
  39.     private static int[][] gradeStudentsAnswers(char[][] answers) {
  40.         char[] answerKeys = {'D', 'B', 'D', 'C', 'C', 'D', 'A', 'E', 'A', 'D'};
  41.         // final list: [student id, student correct responses]
  42.         int[][] finalList = new int[answers.length][2];
  43.         int i = 0;
  44.         for (int studentNo = 0; studentNo < answers.length; ++studentNo) {
  45.             int correctAnswers = 0;
  46.             for (int answerNo = 0; answerNo < answers[studentNo].length;
  47.                  ++answerNo) {
  48.                 if (answers[studentNo][answerNo] == answerKeys[answerNo]) {
  49.                     ++correctAnswers;
  50.                 }
  51.             }
  52.             finalList[i][0] = studentNo;
  53.             finalList[i][1] = correctAnswers;
  54.             ++i;
  55.         }
  56.         sortFinalList(finalList);
  57.  
  58.         return finalList;
  59.     }
  60.  
  61.     /**
  62.      * sorts the student final list on the basis of number of correct responses
  63.      * @param finalList list generated after grading
  64.      */
  65.     private static void sortFinalList(int[][] finalList) {
  66.         // selection sort on the basis of score
  67.         for (int row = 0; row < finalList.length - 1; ++row) {
  68.             int maximumIndex = row;
  69.             for (int col = row + 1; col < finalList.length; ++col) {
  70.                 if (finalList[col][1] > finalList[row][1]) {
  71.                     maximumIndex = col;
  72.                 }
  73.             }
  74.             if (maximumIndex != row) {
  75.                 int[] temp = finalList[row];
  76.                 finalList[row] = finalList[maximumIndex];
  77.                 finalList[maximumIndex] = temp;
  78.             }
  79.         }
  80.     }
  81.  
  82.     private static void announceResult(int[][] result) {
  83.         for (int i = 0; i < result.length; ++i) {
  84.             System.out.printf("Rank #%d: Student %d, Correct Responses: %d / 10\n",
  85.                     i + 1, result[i][0], result[i][1]);
  86.         }
  87.     }
  88. }
Success #stdin #stdout 0.12s 34228KB
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Standard input is empty
stdout
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Rank #1: Student 4, Correct Responses: 8 / 10
Rank #2: Student 7, Correct Responses: 7 / 10
Rank #3: Student 1, Correct Responses: 6 / 10
Rank #4: Student 2, Correct Responses: 5 / 10
Rank #5: Student 0, Correct Responses: 7 / 10
Rank #6: Student 5, Correct Responses: 7 / 10
Rank #7: Student 6, Correct Responses: 7 / 10
Rank #8: Student 3, Correct Responses: 4 / 10
https://ideone.com/K8rP9G
language:
Java (12.0.1)
created:
3 years ago
visibility:
secret

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