java平均二维数组列
我试图平均一个二维数组列。我的代码似乎是将行中的数字相加,然后除以总数。在这个例子中,应该只有4个赋值,但它循环了12次。有人知道我的代码出了什么问题吗?这些数字是从一个文本文件输入的,位于完整代码的更高位置(不确定这是否会影响它)
示例阵列:
[2,3,6,7]
[4,5,6,7]
[2,2,2,2]
System.out.println("Average score of each assignment:");
//TODO: compute and print the average on each assignment
double total = 0;
int totallength = 0;
int assignment = 1;
for (int i = 0; i < myArray.length; i++) {
for (int j = 0; j < myArray[i].length; j++) {
total += myArray[i][j];
totallength++;
System.out.println("Assignment #" + assignment++
+ " Average: " + (total / totallength));
}
}
以下是我的输出:
Average score of each assignment:
Assignment #1 Average: 2.0
Assignment #2 Average: 2.5
Assignment #3 Average: 3.6666666666666665
Assignment #4 Average: 4.5
Assignment #5 Average: 4.4
Assignment #6 Average: 4.5
Assignment #7 Average: 4.714285714285714
Assignment #8 Average: 5.0
Assignment #9 Average: 4.666666666666667
Assignment #10 Average: 4.4
Assignment #11 Average: 4.181818181818182
Assignment #12 Average: 4.0
期望输出:
Assignment #1 Average: 2.666666666
Assignment #2 Average: 3.333333333
Assignment #3 Average: 4.666666666
Assignment #4 Average: 5.333333333
# 1 楼答案
您可以使用^{} 方法:
# 2 楼答案
您可以按如下方式操作:
输出:
# 3 楼答案
如果要获得每行的平均值,则需要初始化每个oter循环上的总计数器,并在求和后仅在外部循环上打印:
顺便说一句,计算平均值更简单的方法是利用java 8流功能: