public class Main {

public static void main(String[] args) {

// 用二维数组表示的学生成绩:

int[][] scores = { //

{ 82, 90, 91 }, //

{ 68, 72, 64 }, //

{ 95, 91, 89 }, //

{ 67, 52, 60 }, //

{ 79, 81, 85 }, //

};

// TODO:

int sum = 0;

double num = 0;

for (int[] ns: scores) {

for (int n: ns) {

sum = sum + n;

num++;

}

}

double average = sum/num;

System.out.println(average);

if (Math.abs(average - 77.733333) < 0.000001) {

System.out.println("测试成功");

} else {

System.out.println("测试失败");

}

}

}