/*
使用二维数组表示一组学生的各科成绩，计算所有学生的平均分
@authur:tangxi.zq
*/

public class Average
{
    public static void main(String[]args)
    {
        int [][] scores = {
            {82, 90, 91},
            {68, 72, 64},
            {95, 91, 89},
            {67, 52, 60},
            {79, 81, 85},
        };
        double average = 0 ;
        double sum = 0;
        int len = 0;
        for (int[]temp:scores)
        {
            len += temp.length;
            for(int n : temp)
            {
                sum += n;
            }
        }
        average = sum / len ;
        System.out.println("学生的平均成绩为:" + (average));
        //test
        if (Math.abs(average - 77.733333) < 0.000001) 
        {
            System.out.println("测试成功");
        } 
        else 
        {
            System.out.println("测试失败");
        }
    }
}