Question

Begin by accessing your Java platform within your virtual lab environment and include the following elements: i am having some issues with a while loop program is not compiling. Create a Java program to accept input for the following two variables: (a) Students and (b) Scores. Create a repetitive loop so the program will ask the user if another entry is desired until the user indicates “No.” Create a variable that will compute the average score for an entire class. Create a variable that will assign a letter grade based on the student’s score using the chart below. Create a variable that will list the number of students who received each of the following grade ranges: A, B, C, D, and F. (Note that “+” and “-” grades fall within the general letter grade range.) Letter Grade Percent A 0.93 A- 0.90 B+ 0.87 B 0.83 B- 0.80 C+ 0.77 C 0.73 C- 0.70 D+ 0.67 D 0.63 D- 0.60

Answer 1

Input:

Output:

import java.util.*;
class Main
{
   public static void main (String[] args)
   {
       Scanner sc = new Scanner(System.in);
      
       ArrayList<String> students = new ArrayList<>();
       ArrayList<Double> scores = new ArrayList<>();
       ArrayList<String> grades = new ArrayList<>();
      
       String answer, tmp;
       double averageScore = 0.0;
      
       int totalScore = 100; //total score assumed to be 100
       int numberOfStudentsForEachGrade[] = {0,0,0,0,0}; // 0th index responds to A, similarly 1->B,2->C,3->D,4->F
       int studentCount=0;
      
       while(true) {
      
       // This step is required because after 1 iteration of the loop,
       // an empty line is read (scanner input stream issue)
       // and it is taken as the value for the answer variable
       // which results into undesirable error.
       // Therefore, if the empty line is assigned to a temporary variable,
       // there won't be any problem.
       if(studentCount > 0)
tmp = sc.nextLine();
           System.out.println("Enter \"No\" to discontinue or else enter anything");
           answer = sc.nextLine();
           if(answer.equalsIgnoreCase("No")) {
               break;
           }
           System.out.println("Enter student name");
           String student = sc.nextLine();
           System.out.println("Enter student score");
           double score = sc.nextDouble();
           students.add(student);
           scores.add(score);
          
           averageScore+=score; // sum of scores till now
          
           // grade calculation
           double percent = score / totalScore;
           if(percent >= 0.93) {
               grades.add("A");
               numberOfStudentsForEachGrade[0]++;
           } else if(percent >= 0.90) {
               grades.add("A-");
               numberOfStudentsForEachGrade[0]++;
           } else if(percent >= 0.87) {
               grades.add("B+");
               numberOfStudentsForEachGrade[1]++;
           } else if(percent >= 0.83) {
               grades.add("B");
               numberOfStudentsForEachGrade[1]++;
           } else if(percent >= 0.80) {
               grades.add("B-");
               numberOfStudentsForEachGrade[1]++;
           } else if(percent >= 0.77) {
               grades.add("C+");
               numberOfStudentsForEachGrade[2]++;
           } else if(percent >= 0.73) {
               grades.add("C");
               numberOfStudentsForEachGrade[2]++;
           } else if(percent >= 0.70) {
               grades.add("C-");
               numberOfStudentsForEachGrade[2]++;
           } else if(percent >= 0.67) {
               grades.add("D+");
               numberOfStudentsForEachGrade[3]++;
           } else if(percent >= 0.63) {
               grades.add("D");
               numberOfStudentsForEachGrade[3]++;
           } else if(percent >= 0.60) {
               grades.add("D-");
               numberOfStudentsForEachGrade[3]++;
           } else {
               grades.add("F");
               numberOfStudentsForEachGrade[4]++;
           }
          
           // System.out.println(students.get(studentCount)+"\t"+
           // scores.get(studentCount)+"\t"+grades.get(studentCount));
           studentCount++;
       }
      
       averageScore = averageScore/studentCount;
      
       System.out.println("The average score for an entire class: "+averageScore);
      
       System.out.println("Student\tScore\tGrade");
       for(int i=0;i<students.size();i++) {
           System.out.println(students.get(i)+"\t"+scores.get(i)+"\t"+grades.get(i));
       }
      
       System.out.println("Number of students with grade A: "+numberOfStudentsForEachGrade[0]);
       System.out.println("Number of students with grade B: "+numberOfStudentsForEachGrade[1]);
       System.out.println("Number of students with grade C: "+numberOfStudentsForEachGrade[2]);
       System.out.println("Number of students with grade D: "+numberOfStudentsForEachGrade[3]);
       System.out.println("Number of students with grade E: "+numberOfStudentsForEachGrade[4]);
   }
}