Question

Write a Java program that reads a file until the end of the file is encountered. The file consists of an unknown number of students' last names and their corresponding test scores. The scores should be integer values and be within the range of 0 to 100. The first line of the file is the number of tests taken by each student. You may assume the data on the file is valid. The program should display the student's name, average (rounded to 1 decimal place) and a letter grade for each student. After processing all student test grades the program should display the overall average (the average of all student averages) rounded to 1 decimal place. DO NOT USE ARRAYS, USE ONLY METHODS THAT ARE MENTIONED BELOW AS PER YOUR REQUIREMENT . Use the following methods in your program to accomplish these tasks, you may use more methods however the ones listed below are mandatory: . studentAverage: This method will have parameters for the number of test scores for one student. It will return the numeric average for that student as a real number determineGrade: This method will have a parameter for the numeric average grade of one student and will return a letter grade for the student, based on the following grading scale: Average Letter Grade . e 90-100 A . 80-89 B . 70-79 60-69 D Below 60 F overallAverage: This method will have parameters for the sum of the numeric averages for all students and the number of students and will return the average of all students as a real number . . Be sure to create your data file first before executing your program. Your data file should have at least 5 records of student data. SAMPLE DATA Brandon 907090 808Ω etc. SAMPLE OUTPUT Name Average Letter Grade Javed 92.4A Alan 86.2 B Brandon 82.0 B The average test grade is: 86.7

Answer 1

Kindly let me know if more corrections are needed.

Please give a thumps up if you like the answer

Program

import java.util.*;
import java.io.*;
import java.text.DecimalFormat;

public class FileStudent {

  
    public static void main(String[] args) throws IOException
   
    {
     
Scanner stdin = new Scanner(new FileReader("studentsgrade.txt"));
  
int num_test;

double classAverage=0.0,sumAvg=0.0;
int count=0;

num_test=stdin.nextInt();
System.out.println("Name\tAverage\tLetter Grade");
        while(stdin.hasNextLine()) {
            sumAvg+=calculateAverage(stdin,num_test);
            count++;
           
        }
        classAverage=overallAverage(sumAvg,count);
        DecimalFormat value = new DecimalFormat("#.#");
      System.out.println("\nThe average test grade is "+value.format(classAverage));
     
stdin.close();

}

    public static double calculateAverage(Scanner stdin,int num_test)
    {
        double sum=0,test_score;
        double avg=0.0;
        String stud_name=stdin.next();
       
        for(int i=0;i<num_test;i++)
        {
            test_score=stdin.nextInt();
            sum+=test_score;
        }
        avg=sum/num_test;
        String grade=determineGrade(avg);
        System.out.println(stud_name+"\t"+avg+"\t"+grade);
        return avg;
    }
    public static String determineGrade(double average)
    {
        if(average>=90)
            return "A";
        else if(average>=80)
            return "B";
        else if(average>=70)
            return "C";
        else if(average>=60)
            return "D";
        else
            return "F";
    }
    public static double overallAverage(double sumAvg,int num_stud)
    {
       double classAverage=sumAvg/num_stud;
       return(classAverage);
    }
}

Output

Name Average Letter Grade
Javed 92.4 A
Alan 86.2 B
Brandon 82.0 B

The average test grade is 86.9

studentsgrade.txt

5
Javed 100 90 80 100 92
Alan 85 75 91 95 85
Brandon 90 70 90 80 80