這是我正在解決的問題：編寫一個程序，讀取一個 3 x 4 矩陣并分別顯示每列和每行的總和。這是示例運(yùn)行：逐行輸入 3×4 矩陣：1.5 2 3 45.5 6 7 89.5 1 3 1Sum of the elements at column 0 is 16.5Sum of the elements at column 1 is 9.0Sum of the elements at column 2 is 13.0Sum of the elements at column 3 is 13.0Sum of the elements at Row 0 is: 10.5Sum of the elements at Row 0 is: 26.5Sum of the elements at Row 0 is: 14.5這是我想出的代碼：package multidimensionalarrays;public class MultidimensionalArrays {    public static void main(String[] args) {        double sumOfRow = 0;        double[][] matrix = new double[3][4];        java.util.Scanner input = new java.util.Scanner(System.in); //Scanner        System.out.println("Enter a 3 by 4 matrix row by row: ");        //Prompt user to enter matrix numbers        for (int row = 0; row < matrix.length; row++) {            for (int col = 0; col < matrix[0].length; col++) {                matrix[row][col] = input.nextDouble();            }        }        double[] sumOfCol =new double[matrix[0].length];          for (int i = 0; i < matrix.length; i++) { //row            for (int j = 0; j < matrix[i].length; j++) { //column                sumOfRow += matrix[i][j];                sumOfCol[j] += matrix[i][j];            }            System.out.println("Sum of the elements at row " + row + " is: " + sumOfRow);        }        System.out.println("Sum of the elements at column " + col + " is: " + sumOfCol);    }             }   我的問題是，當(dāng)最后打印列和行的總和時，它無法識別row或col變量。我一直在玩它，現(xiàn)在可能已經(jīng)改變了幾個小時，但我似乎無法做到這一點，有人可以幫助我解決我做錯了什么嗎？另外我不知道我是否正確地進(jìn)行了列求和？