Chapter 7, Problem 20E

Explanation of Solution

Method “matrixAdd()” to return the added values of two dimensional array:

//Definition of class Test

public class Test

{

    //Definition of main class

    public static void main(String[] args)

    {

        //Create an two dimensional array

        int a[][] = { { 10, 20 },

                { 15, 25}};

        int b[][] = { { 25, 35 },

                { 25, 15}};

        //Call the method matrixAdd()

        int res[][]=matrixAdd(a, b);

        //For loop to print the array

        for(int i=0; i<a.length; i++) {

            for(int j=0;j<b.length;j++)

            {

                System.out.print(" "+res[i][j]);

            }

        }

    }

    //Definition of method matrixAdd

    public static int[][] matrixAdd(int[][] a, int[][] b)

    {

        //Declare the required variables

        int rows = a.length;

        int cols = 0;

        //Check whether the rows is greater than 0

        if (rows > 0)

        {

            //Get the length of array

            cols = a[0]...