Question

JAVA posted multiple times

Write a program that prompts the user to enter a matrix number of rows and number of columns.
In main method create 2D matrix based on the number of rows and columns input by the user; randomly fills the matrix with 0s and 1s and prints it.
Create method sumColumns that takes only the matrix you created in main method and find the sum of each column with even index and prints it. Do not use global variables.

Here is a sample run of the program:

Enter number of rows and columns 4 6
1 0 0 0 1 0
0 0 0 0 1 0
1 0 1 0 1 1
1 1 1 1 0 1
3 2 3
Process finished with exit code 0

Answer 1

Please find the answer below.
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Matrix.java

package staticclasses;

import java.util.Random;
import java.util.Scanner;

public class Matrix {

   static void sumColumns(int matrix[][]) {
       for (int j = 0; j < matrix[0].length; j++) {
           if(j%2==0) {
               int sum=0;
               for (int i = 0; i < matrix.length; i++) {
                   sum +=matrix[i][j];
               }
               System.out.print(sum+" ");
           }
       }
   }

   public static void main(String[] args) {
       Scanner sc = new Scanner(System.in);
       System.out.print("Enter number of rows and columns ");
       int row,column;
       row = sc.nextInt();
       column = sc.nextInt();
       int matrix[][] = new int[row][column];
       Random rand = new Random();

       for (int i = 0; i < row; i++) {
           for (int j = 0; j < column; j++) {
               matrix[i][j]= rand.nextInt(2);
               System.out.print(matrix[i][j]+" ");
           }
           System.out.println();
       }
       sumColumns(matrix);
   }
}