import java.util.Arrays;

public class HelloWorld {

public static void main(String[] args) {

// 用二维数组表示的学生成绩:

int sum = 0;

int[][] scores = { { 82, 90, 91 }, { 68, 72, 64 }, { 95, 91, 89 }, { 67, 52, 60 }, { 79, 81, 85 }, };

for (int[] arrs : scores) {

for (int data : arrs) {

sum += data;

}

}

double average = average = (float)sum / (scores[0].length * scores.length);

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");

}

}

}