TestScores.java

/*

Asked on Y!A on 23.04.2014:

Write a java program that reads the data from a file and prints each student name and the percentage
 they made in the exam.?
The text file “marks.txt” stores the total mark for an exam on the first line and student's names
and test scores on the following lines as shown below (the number of student data stored in the
file is not known.) Write a java program that reads the data from the file and prints each student
name and the percentage they made in the exam.

marks.txt
125
Mary 102
Josh 88

*/

import java.io.*;
import java.util.Scanner;
import java.util.NoSuchElementException;

public class TestScores {

    /**
    *   Program:    TestScores.java
    *   Purpose:    Read data from file, display names and scores as percentages.
    *   Creator:    Chris Clarke
    *   Created:    23.04.2014
    *   Notes:      Search Amazon for:
    *           "50 Java Program Source Codes" and "50 More Java Source Codes"
    *           available in Kindle e-book format and in paperback.
    */

    public static void main(String[] args) {
        File f;
        double totalMark = 0.0f;
        int testScore = 0;
        double percent = 0.0f;
        Scanner fileScan;
        String name = "";
        try {
            f = new File("marks.txt");
            fileScan = new Scanner(f);
            if (fileScan.hasNext()) {
                totalMark = Double.parseDouble( fileScan.nextLine());
                System.out.println( (int)(totalMark));
            } // end if

            while (fileScan.hasNext()) {
                name = fileScan.next();
                testScore = Integer.parseInt( fileScan.next());
                percent = (testScore / totalMark) * 100.0;
                System.out.printf("%s %5.1f percent%n", name, percent);
            } // end while
        }
        catch (FileNotFoundException e) {
            System.out.println("File Not Found!");
        }
        catch (NoSuchElementException e) {
            System.out.println("Error: missing data!");
        }
        catch (NumberFormatException e) {
            System.out.println("Not a number!");
        } // end try..catch
    } // end main()

} // end class TestScores