Question

/**
 * Class that defines a method which performs matrix addition. This gives students their first practice at creating and using
 * the code needed for higher dimensional arrays.
 *
 * @author Matthew Hertz
 */
public class MatrixAddition {

  /**
   * Given two equally-sized matrices, return a newly allocated matrix containing the result of adding the two.<br/>
   * Precondition: a &amp; b must have the same number of rows and each row will have the same number of columns. You should
   * assume preconditions hold and can write your code knowing this is always be true.
   *
   * @param a The first matrix we will be adding
   * @param b The second matrix whose entries will be added
   * @return Newly allocated array whose entries are equal to the sum of the entries in a &amp; b
   * at the identical row and column.
   */
  public int[][] add(int[][] a, int[][] b) {

  }
}

Answer 1

import java.util.Scanner;

class MatrixAddition

{

static int m, n;

public static void main(String args[])

{

  

Scanner in = new Scanner(System.in);

System.out.println("Enter the no of rows and columns of matrix");

m = in.nextInt();

n = in.nextInt();

int first[][] = new int[m][n];

int second[][] = new int[m][n];

int sum[][] = new int[m][n];

System.out.println("Enter the elements of matrix 1");

for (int c = 0 ; c < m ; c++ )

for (int d = 0 ; d < n ; d++ )

first[c][d] = in.nextInt();

System.out.println("Enter the elements of matrix 2 ");

for (int c = 0 ; c < m ; c++ )

for (int d = 0 ; d < n ; d++ )

second[c][d] = in.nextInt();

  

sum = add(first, second);

System.out.println("Sum of entered matrices:-");

  

for (int c = 0 ; c < m ; c++ )

{

for ( int d = 0 ; d < n ; d++ )

System.out.print(sum[c][d]+"\t");

System.out.println();

}

}

public static int[][] add(int[][]first , int [][]second){

int sum[][] = new int[m][n];

for (int c = 0 ; c < m ; c++ )

for (int d = 0 ; d < n ; d++ )

sum[c][d] = first[c][d] + second[c][d];

return sum;

}

}

// This will provide you the sum of matixes of the same size. First enter the index values and enter the matrix of your own values. you will get the sum of matrix as output, you need to change the + to - for subtraction of matrix

Please see below for the sample run in my local

terminated> MatrixAddition [Java Application] C:Program Files Enter the no of rows and columns of matrix 2 2 Enter the elements of matrix 1 2 2 Enter the elements of matrix 2 2 4 Sum of entered matrices:- 4. fi