::::::::::::::
Mean.java
::::::::::::::
class Mean {
  public static void main(String[] args) {
    ConsoleReader c = new ConsoleReader(System.in); 
    System.out.print("Enter value: "); 
    String line = c.readLine(); 
    double sum = 0; 
    int i = 0; 
    while (! line.equals("done")) {
      double score = Double.parseDouble(line); 
      sum = sum + score; 
      i = i + 1; 
      System.out.println("Score " + i + " entered: " + score + ", current sum: " + sum);       
      System.out.print("Enter value: "); 
      line = c.readLine(); 
    } 
    if (i > 0) {
      System.out.println("The average of entered scores is: " + sum / i); 
    } else {
      System.out.println("No scores, no average. Thank you."); 
    } 
  } 
}
::::::::::::::
PostOffice.java
::::::::::::::
class PostOffice {
  public static void main(String[] args) {
    ConsoleReader c = new ConsoleReader(System.in); 
    System.out.print("Weight (lbs): "); 
    double w = c.readDouble(); 
    if (w <= 2) {
      System.out.println("Less than 2 lbs. Mailing cost is 10 dollars."); 
    } else {
      if (w > 100) {
        System.out.println("Sorry, we can't mail packages over 100 lbs in weight."); 
      } else {
        double cost; 
        cost = 10; 
        System.out.println("  10 dollars for the first two pounds."); 
        cost = cost + (w - 2) * 3.75; 
        System.out.println("  " + (w - 2) * 3.75 + " dollars added for the weight that exceeds the 2 pounds. "); 
        if (w > 70) {
          cost = cost + 10; 
          System.out.println("  Over 70 pounds. Excess weight surcharge applies: 10 dollars.");
        } else {

        } 
        System.out.println("Total mailing cost is " + cost + " dollars."); 
      } 
    } 
  } 
}