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打卡

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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;
                  int count=0;
                  for(int arr:scores){
                  for(int n:arr){
                    sum+=n;
                    count++;
}
}
                  double average = 0;
                  average= (double)sum/count;
                  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");
        }
    }
}

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