import java.io.*;

class Midsem2 {

  final int numStudents = 3;
  StudentEntry[] entries; // rollNum/marks entries

  public Midsem2() {
    entries = new StudentEntry[numStudents];
  }

  public void writeFile(String fileName) throws FileNotFoundException {
    FileOutputStream fout = new FileOutputStream(fileName);
    PrintStream pt = new PrintStream(fout);
    for(int i = 0; i < entries.length; i++) {
      String toPrint = entries[i].rollNum + " " + entries[i].midsem2marks/10.0;
      pt.println(toPrint);
    } // End for(i)
    pt.close();
  } // End writeFile()

  public void readFile(String fileName) throws FileNotFoundException, IOException, NumberFormatException {
    FileReader fin = new FileReader(fileName);
    BufferedReader br = new BufferedReader(fin);
    for(int i = 0; i < numStudents; i++) {
      String line = br.readLine();
      int space_index = line.indexOf(" ");
      String rollNum = line.substring(0, space_index);
      String marksStr = line.substring(space_index+1);
      double marks = Double.parseDouble(marksStr);
      entries[i] = new StudentEntry(rollNum, marks);
    } // End for(i)
  } // End readFile()

  public static void main(String[] args) throws FileNotFoundException, IOException, NumberFormatException {

    Midsem2 m2 = new Midsem2();
    m2.readFile("midsem2-example.txt");
    double sum = 0;
    for(int i = 0; i < m2.numStudents; i++) {
      sum += m2.entries[i].midsem2marks;
    }
    System.out.println("Avg="+(sum/m2.numStudents));
    //m2.writeFile("/home/bhaskar/cvs/iitk_cvs/courses/esc101-spring2005/lectures/lec30/midsem2-weighted.txt");
    m2.writeFile("midsem2-weighted.txt");
    System.out.println("Weighted marks written to file midsem2-weighted.txt");
  } // End main()

} // End Midsem2