/**
 * Title:        Chapter 4, "Methods"
 * Description:  Examples for Chapter 4
 * Copyright:    Copyright (c) 2000
 * Company:      Armstrong Atlantic State University
 * @author Y. Daniel Liang
 * @version 1.0
 */

// ComputeMeanDeviation.java: Demonstrate using the math methods
// package chapter4;

public class ComputeMeanDeviation
{
  /**Main method*/
  public static void main(String[] args)
  {
    final int count = 10; // Total numbers
    int number = 0; // Store a random number
    double sum = 0; // Store the sum of the numbers
    double squareSum = 0; // Store the sum of the squares

    // Create numbers, find its sum, and its square sum
    for (int i=0; i<count; i++)
    {
      // Generate a new random number
      number = (int)Math.round(Math.random()*1000);
      System.out.println(number);

      // Add the number to sum
      sum += number;

      // Add the square of the number to squareSum
      squareSum += Math.pow(number, 2); // Same as number*number;
    }

    // Find mean
    double mean = sum/count;

    // Find standard deviation
    double deviation = Math.sqrt((squareSum - sum*sum/count)/(count - 1));

    // Display result
    System.out.println("The mean is " + mean);
    System.out.println("The standard deviation is " + deviation);
  }
}