package Maths;

/**
 * Calculate average of a list of numbers
 */
public class Average {
 private static final double SMALL_VALUE = 0.00001f;
 public static void main(String[] args) {
 assert Math.abs(average(new double[]{3, 6, 9, 12, 15, 18, 21}) - 12) < SMALL_VALUE;
 assert Math.abs(average(new double[]{5, 10, 15, 20, 25, 30, 35}) - 20) < SMALL_VALUE;
 assert Math.abs(average(new double[]{1, 2, 3, 4, 5, 6, 7, 8}) - 4.5) < SMALL_VALUE;
 int[] array = {2, 4, 10};
 assert average(array) == 5;
 }

 /**
 * Calculate average of a list of numbers
 *
 * @param numbers array to store numbers
 * @return mean of given numbers
 */
 public static double average(double[] numbers) {
 double sum = 0;
 for (double number : numbers) {
 sum += number;
 }
 return sum / numbers.length;
 }
 
 /**
 * find average value of int array
 *
 * @param array the array contains element and the sum does not 
 * excess long value limit
 * @return average value
 */
 public static int average(int[] array) {
 long sum = 0;
 for (int i = 0 ; i < array.length; ++i) {
 sum += array[i];
 }
 return (int)(sum / array.length);
 }
}