/*       Problem Statement
   This class will calculate and display the average of sets of numbers entered
     by the user.
   It will calculate the mean average of that set and display it, repeatedly,
     until the user says that he has no more sets.
   This program will then display the number of sets processed and the mean
     average of all the values in all the sets.  */

import java.util.Scanner;

public class CalculateAverages {
  public static void main(String[] args) {
   // Declare variables
   
      double count; // Number of values left to be entered in the current set
      double unalteredCount; // Total number of values in the current set
      double value; // An element of the current set
      double setTotal = 0; // Running total of the values in the current set
      double setAverage; // Mean average of the values in the current set
      double setCount = 0; // Total number of sets entered
      double grandTotal = 0; // Total of all values entered
      double grandCount = 0; // Total number of values entered
      double totalAverage; // Mean average of all values entered
      // For determining if there's another set to be entered or not
         String another; 
      // To scan in the count of elements in the current set
         Scanner scanCount = new Scanner (System.in);  
      // To scan in the elements in the current set
         Scanner scanValues = new Scanner (System.in);

  // Ask user if there is a set to be entered

     Scanner scanSets = new Scanner (System.in);
     System.out.print("Is there a set to be entered (y/n)? ");
     another = scanSets.nextLine();

      while (another.equalsIgnoreCase("y")) // Allows y or Y
      {
      // Ask user how many values are in the set.
               
         System.out.print("How many values are in this set? ");
         count = scanCount.nextDouble();
         unalteredCount = count; // preserves number in set for figuring average
         grandCount = count + grandCount; // to figure totalAverage

      // Ask user for values of the set.
      
         while (count > 0)
         {
         System.out.print("Enter a value: ");
         value = scanValues.nextDouble();
         setTotal = value + setTotal;
         count = count - 1; // counts down number of elements left to be entered
         }

      // Calculate and display mean average of set.
      
         setAverage = setTotal / unalteredCount;
         System.out.println("Average of set(s) entered: " + setAverage);
         grandTotal = setTotal + grandTotal;
         
      // Count number of sets entered.
      
         setCount = setCount + 1;

      // Ask user if there is another set to be entered.

         System.out.println();
         System.out.print("Is there another set to be entered (y/n)? ");
         another = scanSets.nextLine();
         setTotal = 0;
      }

   // When no more sets are to be entered, calculate mean average of all sets
   // and display total number of sets.
      
      System.out.println("Total number of sets is: " + setCount);
      totalAverage = grandTotal / grandCount;
      System.out.println("Average of all sets is: " + totalAverage);
  }
}