create a program which will do the following: Read from a file a student\'s firs

ID: 669218 • Letter: C

Question

create a program which will do the following:

Read from a file a student's first name, last name, full name (with spaces), TNumber, Major, Class Name, 3 exam grades, and 5 homework grades. All grades should be in the 0 to 100 range.

Determine the average of the exam grades and homework grades. Then, determine the overall average for the student with a weighted average. Exams are worth 60% (20% each) and homework is worth 40%.

Output all of the student's information, grades and the student's averages (exam average, homework average, and course average) to both the screen and to a file.

Format all numeric values to 2 decimal places.

Explanation / Answer

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class Student {

   public static void main(String[] args) throws Exception{

       //the contents in the file are in the following format each separated by '#'
       //first name, last name, full name (with spaces), TNumber, Major, Class Name, 3 exam grades, and 5 homework grades.
       //change delimiter as per ur need
       final String delimiter = "#";
       BufferedReader br = null;
       String sDetails = "";
       try {

           String fname;
           String lname;
           String fullname;
           int tnumber;
           String major;
           String className;
           double examGrades[] = new double[]{ 0,0,0};
           double hwGrades[] = new double[]{ 0,0,0};

           String sCurrentLine;

           br = new BufferedReader(new FileReader("input.txt"));
           sCurrentLine = br.readLine();

           if (sCurrentLine != null) {
               System.out.println(sCurrentLine);
               String[] fields = sCurrentLine.split(delimiter);
               if(fields != null && fields.length >0) {
                   fname = fields[0];
                   lname = fields[1];
                   fullname = fields[2];
                   tnumber = Integer.parseInt(fields[3]);
                   major = fields[4];
                   className = fields[5];
                   for(int i =0; i < 3; i++)
                       examGrades[i] = Double.parseDouble(fields[6+i]);
                   for(int i =0; i < 5; i++)
                       hwGrades[i] = Double.parseDouble(fields[9+i]);

                   //calculate exam Grades average

                   double examGrTotal = (examGrades[0]+examGrades[1]+examGrades[2]);
                   double examGrAvg = examGrTotal/3.0;

                   double hwGrTotal = (hwGrades[0]+hwGrades[1]+hwGrades[2]+hwGrades[3]+hwGrades[4]);
                   double hwGrAvg = hwGrTotal/5.0;

                   //Exams are worth 60% (20% each) and homework is worth 40% - total 8 grades
                   double courseAvg = ((examGrTotal * 60/100)+(hwGrTotal * 40))/8;

                   //print student details
                   System.out.println(" Student details : ");
                   System.out.println(" Firstname : "+fname+" Last Name: "+lname+" Full Name: "+fullname);
                   System.out.println(" TNumber : "+tnumber+" Major: "+major+" Class Name : "+className);
                   System.out.println(" 3 exam grades: "+examGrades[0]+ ","+examGrades[1]+","+examGrades[2]);
                   System.out.println(" 5 homework grades "+hwGrades[0]+ ","+hwGrades[1]+ ","+hwGrades[2]+ ","+hwGrades[3]+ ","+hwGrades[4]);
                   System.out.println(" Averages : ");
                   System.out.println(" Exams Grades Avg: "+examGrAvg+" Homework Grades Avg :"+hwGrAvg+ " Course Avg: "+courseAvg);

                   sDetails = (" Firstname : "+fname+" Last Name: "+lname+" Full Name: "+fullname);
                   sDetails += (" TNumber : "+tnumber+" Major: "+major+" Class Name : "+className);
                   sDetails += (" 3 exam grades: "+examGrades[0]+ ","+examGrades[1]+","+examGrades[2]);
                   sDetails += (" 5 homework grades "+hwGrades[0]+ ","+hwGrades[1]+ ","+hwGrades[2]+ ","+hwGrades[3]+ ","+hwGrades[4]);
                           sDetails +=(" Averages : ");
                   sDetails +=(" Exams Grades Avg: "+examGrAvg+" Homework Grades Avg :"+hwGrAvg+ " Course Avg: "+courseAvg);

               }

           }

       } catch (IOException e) {
           e.printStackTrace();
       } finally {
           try {
               if (br != null)br.close();
           } catch (IOException ex) {
               ex.printStackTrace();
           }
       }

       //write to file
       if(sDetails != null && !sDetails.isEmpty()) {
           try {

               File file = new File("output.txt");

               // if file doesnt exists, then create it
               if (!file.exists()) {
                   file.createNewFile();
               }

               FileWriter fw = new FileWriter(file.getAbsoluteFile());
               BufferedWriter bw = new BufferedWriter(fw);
               bw.write(sDetails);
               bw.close();

               System.out.println("Done");

           } catch (IOException e) {
               e.printStackTrace();
           }
       }

   }


}

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