package lesson_3; public class Frame_15 { public static void main(String[] args) { // int[] data_1= new int[] {3,5,-6,5,12,500}; int[] data_2= new int[] {0}; int[] data_3= new int[] {}; int[] data_4= new int[] {-3}; int[] data_5= new int[5]; int[] data_6= null; System.out.println(avarage(data_1)); System.out.println(avarage(data_2)); System.out.println(avarage(data_3)); System.out.println(avarage(data_4)); System.out.println(avarage(data_5)); System.out.println(avarage(data_6)); } static double avarage(int[] data){ double aver=-1; double sum = 0.0; if (data == null||data.length<=0){return aver;} for (int d:data){ sum+=d; } aver = sum/data.length; return aver; } }