Question

A continuation of your grading software will be made (you do not need your other code for this assignment). In this one you will intake a students first name and last name from a file called "students.txt". Next, there is a file called grades.txt that contains the grades in a course. There will be three grades for each student in "grades.txt" (see example file bellow). In "student.txt" there are two students first and last names. In "grades.txt" the grades for each student will be on the same line number as the students name was on in "students.txt". So if line 1 of "students.txt" contains: Joe Blow then line 1 of "grades.txt" would contain Joe Blow's grades: 85 54.3 56 Into an output file called "report.txt" output the student's last name then a comma the their first name. Following this, calculate their average and assign a letter grade using the following scale:

'A': grade >= 90 'B': 90 > grade >= 80 'C': 80 > grade >= 70 'D': 70 > grade >= 60 'F': grade < 60 If the final grade of a student is greater than 100 instead of printing their letter grade output the statement "Teacher was far too easy". The "report.txt" should have a heading on each of the columns the first saying "Student's Name" and the second saying "Student's Grade".

Answer 1

package StudentGrade;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;

public class Grader {

   public static String getGrade(double average)
   {
       if(average > 100)
           return "Teacher was far too easy";
       else if(average >= 90)
           return "A";
       else if(average >= 80 && average < 90)
           return "B";
       else if(average >= 70 && average < 80)
           return "C";
       else if(average >= 60 & average < 70)
           return "D";
       else
           return "F";
   }
   public static void main(String[] args) {
       BufferedReader student_reader, grade_reader;
       ArrayList<String []> name_list = new ArrayList<String[]>();
       ArrayList<Double> grade_list = new ArrayList<Double>();
       int total_students = 0;
       try {
           student_reader = new BufferedReader(new FileReader("students.txt"));
           grade_reader = new BufferedReader(new FileReader("grades.txt"));
           String s_line = student_reader.readLine();
           String g_line = grade_reader.readLine();
           while (s_line != null) {
               System.out.println(s_line);
               String [] name = s_line.split(" ");
               name_list.add(name);              
               s_line = student_reader.readLine();
               System.out.println(g_line);
               String [] grades = g_line.split(" ");
               double[] grade_vals = new double[3];
               double sum = 0;
               for(int i=0;i<grades.length;i++)
               {
                   grade_vals[i]= Double.parseDouble(grades[i]);
                   sum += grade_vals[i];
               }
               grade_list.add(sum/3);
               g_line = grade_reader.readLine();
           }
           student_reader.close();
           grade_reader.close();
           total_students = name_list.size();
           BufferedWriter writer = new BufferedWriter(new FileWriter("report.txt"));
           writer.write("Student's Name\tStudent's Grade\n");
           for(int i =0;i<total_students;i++)
           {
               String last_name = name_list.get(i)[1];
               String first_name = name_list.get(i)[0];
               double avg = grade_list.get(i);
               writer.write(last_name+","+first_name+"\t"+getGrade(avg)+"\n");
           }
           writer.close();
       } catch (IOException e) {
           e.printStackTrace();
       }
   }
}