Question

amaining Time: 1 hour, 49 minutes, 15 seconds. Jestion Completion Status: Write a program that asks the user for an input file name, open, read ar number of students is not known. For each student there is a name and and display a letter grade for each student and the average test score fc • openFile: This method open and test the file, if file is not found and exit. Otherwise, return the opened file to the caller. The nan readData: This method reads the names and scores of the stude and the file scanner are passed as parameters to the method. prin Table: This methods prints to an output file and the monit format. The arrays are passed as parameters to the method. • calcAverage: This method should accept the array of scores as parameters to the method. determine Grade: This method should accept the test score arr based on the following grading scale: o Score Letter Grade o 90-100 A o 80-89 B o 70-79 o 60-69 o Below 60 F MOA

in java plz

Answer 1

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class ComputeGrades {

    class Student {
        String firstName, lastName;
        int marks;
    }

    public static File openFile(String fileName) {
        File f = new java.io.File(fileName);
        if(!f.exists()) {
            System.out.println("File does not exist");
            System.exit(1);
        }
        return f;
    }
    
    public static int readData(Scanner reader, Student studentData[]) {
        int count = 0;
        while(reader.hasNextLine()) {
            studentData[count].marks = reader.nextInt();
            studentData[count].firstName = reader.next();
            studentData[count].lastName = reader.next();
            count++;
        }
        return count;
    }
    
    private static double calcAverage (Student studentData[], int count) {
        double sumOfScores = 0;
        for(int i=0; i<count; i++) {
            sumOfScores += studentData[i].marks;
        }
        
        return sumOfScores/count;
    }
    
    public static void printTable(Student studentData[], int count) {
        System.out.printf("%-20s%-20s%-20s\n", "Name", "Score", "Grade");
        for(int i=0; i<count; i++) {
            System.out.printf("%-20s%-20d%-20s\n",
                    studentData[i].firstName + " " + studentData[i].lastName, studentData[i].marks,
                    determineGrade(studentData[i].marks));
        }
    }

    // to determine the grade based on the score value
    private static String determineGrade(int score) {
        if (score >= 90)
            return "A";
        else if (score >= 80)
            return "B";
        else if (score >= 70)
            return "C";
        else if (score >= 60)
            return "D";
        else
            return "F";
    }

    public static void main(String[] args) throws FileNotFoundException {
        
        Scanner s = new Scanner(System.in);
        
        System.out.println("Input File name: ");
        String fileName = s.nextLine();
        
        File file = openFile(fileName);
        Scanner reader = new Scanner(file);
        
        Student studentData[] = new Student[100];
        int n = readData(reader, studentData);
        
        printTable(studentData, n);
        
        System.out.printf("%-20s: %.2f\n", "Average: ", calcAverage(studentData, n));
        
        // close the scanner
        s.close();
    }


}

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