Write a Java program to Add Two Matrices

Problem Description

In this post, we will write a sample java program to add two matrices. We would prompt the matrix dimensions and the matrix elements from the user. We will calculate the matrix sum as a third matrix and display the output in the console window. At the end of the post, we will display a sample output of the program.

Java Program

package matrix;

import java.util.Scanner;
// Demo program to add two matrices 
// www.TestingDocs.com
public class AddMatrixDemo {

 public static void main(String args[]) {

 Scanner in = new Scanner(System.in);
 System.out.println("Please enter the number of Rows and Columns of Matrix:= ");

 //intialise rows of matrix as m
 int m = in.nextInt();

 //intialise columns of matrix as n
 int n = in.nextInt();

 //intialise the first matrix with m as rows and n as columns
 int firstMatrix[][] = new int[m][n];

 //intialise the second matrix with m as rows and n as columns
 int secondMatrix[][] = new int[m][n];

 //intialise the sum of two matrices with m as rows and n as columns
 int sumOfMatrix[][] = new int[m][n];

 System.out.println("Enter the elements of First Matrix:= ");
 for (int i=0;i<m;i++)
 for (int j=0;j<n;j++)
 firstMatrix[i][j] = in.nextInt();

 System.out.println("Enter the elements of Second Matrix:= ");
 for (int i=0;i<m;i++)
 for (int j=0;j<n;j++)
 secondMatrix[i][j]=in.nextInt();

 //declare the elements of both matrices as i & j
 for (int i=0;i<m;i++)
 for (int j=0;j<n;j++)
 sumOfMatrix[i][j]=firstMatrix[i][j] + secondMatrix[i][j];

 System.out.println("Sum of the Two Matrices: ");

 for (int i=0;i<m;i++)
 {
 for (int j=0;j<n;j++) {
 System.out.print(sumOfMatrix[i][j] + " ");
 }
 System.out.println();
 }
 }
}

Screenshot

 

Sample program output

Please enter the number of Rows and Columns of Matrix:=
2 3
Enter the elements of First Matrix:=
3 7 9
6 4 5
Enter the elements of Second Matrix:=
4 7 9
2 1 6
Sum of the Two Matrices:
7 14 18
8 5 11