Java Array Average average(int[] a)

Description

average

License

Open Source License

Declaration

public static int average(int[] a) throws Exception 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

public class Main {
    public static int average(int[] a) throws Exception {
        int sum = sum(a);
        return sum / a.length;
    }//from  w ww. j  a  va  2s  . c  om

    public static int sum(/*@ nullable @*/ int[] a) throws Exception {
        if (a == null)
            throw new Exception("Array is null.");
        else {
            int sum = 0;
            /*@ loop_invariant i >= 0 && i <= a.length;
              @ loop_invariant sum == (\sum int j; 0 <= j && j < i; a[j]);
              @ decreasing a.length - i;
              @ assignable sum, i;
              @*/
            for (int i = 0; i < a.length; i++)
                sum += a[i];
            return sum;
        }
    }
}

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