java方法中2D数组行中的项之和

Question

我目前参加了一个在线java课程，我的问题如下：

Write a method addRow which has two parameters: a 2D array of doubles and an int. Return the sum of the entries in the row given by the second parameter. Return 0 if the row number is invalid. Do not assume that the number of rows and columns are the same.

到目前为止，我对这个问题的代码如下（我只能创建2D数组）：

int table[][] = new int[4][5];

table[0][0] = 0;
table[0][1] = 1;
table[0][2] = 2;
table[0][3] = 3;
table[0][4] = 4;

table[1][0] = 1;
table[1][1] = 2;
table[1][2] = 3;
table[1][3] = 4;
table[1][4] = 5;

table[2][0] = 1;
table[2][1] = 2;
table[2][2] = 3;
table[2][3] = 4;
table[2][4] = 5;

/*System.out.println table*/

Answer 1

首先，根据您的问题，您形成的数组是错误的。它提到了doubles的2D数组，但您选择了定义int的2D数组

你的桌子应该像下面这样

double table[][] = new double[4][5];

这个问题本身就很简单。创建函数addRow(double[][] array, int row)

public static double addRow(double[][] array, int row) {
  double sum = 0.0;
  // check for valid input as row number
  if (row < array.length) {
      // iterate over all columns/cells of that row
      for (int i = 0; i < array[row].length; i++) {
           sum = sum + array[row][i];
      }
  }
  return sum;
}