# Exercise 7.1

Sep 30th, 2022
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1. import java.util.Scanner;
2.
3. public class Exercise7_1 {
4.   public static double sumColumn(double[][] m, int columnIndex) {
5.     double sum = 0;
6.     for (int i = 0; i < m.length; i++) {
7.       sum += m[i][columnIndex];
8.     }
9.     return sum;
10.   }
11.
12.   public static void main(String[] args) {
13.     double[][] matrix = new double[3][4];
14.     String[][] rows = new String[3][4];
15.     Scanner in = new Scanner(System.in);
16.     System.out.println("Enter a 3-by-4 matrix row by row:");
17.     rows[0] = in.nextLine().split(" ");
18.     rows[1] = in.nextLine().split(" ");
19.     rows[2] = in.nextLine().split(" ");
20.     for (int i = 0; i < rows.length; i++) {
21.       for (var j = 0; j < rows[i].length; j++) {
22.         matrix[i][j] = Double.parseDouble(rows[i][j]);
23.       }
24.     }
25.     for (int i = 0; i < 4; i++) {
26.       double sum = sumColumn(matrix, i);
27.       System.out.println("Sum of the elements at column " + i + " is " + sum);
28.     }
29.   }
30. }
31.