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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);

}

}