public class AverageFunction
{
  public static double average(double... values) // return method returns value void method does not return result.
  {
    double sum = 0;
    for (double v : values) {
      sum += v;
    }
    return values.length == 0 ? 0 : sum / values.length;

  }

  public static void main(String[] args)
  {
    double[] score = {1,3,4,5};
    System.out.println(average(score));
    System.out.println(average(1, 3, 4, 5));
  }
}