Matrix Addition Example Java Program


Definition

A matrix (plural matrices) is a rectangular array of numbers, symbols, or expressions, arranged in rows and columns that is treated in certain prescribed ways. Matrix addition is the operation of adding two matrices by adding the corresponding entries together. Two matrices must have an equal number of rows and columns to be added. The sum of two matrices A and B will be a matrix which has the same number of rows and columns as do A and B. The sum of A and B, denoted A + B, is computed by adding corresponding elements of A and B.

Matrix Addition Example Program

import java.util.Scanner;
class MatrixAddition{
	public static void main(String args[]){
		int rows,columns, c, d;
		Scanner in = new Scanner(System.in);
		System.out.println("Enter the number of rows and columns of matrix");
		rows= in.nextInt();
		columns  = in.nextInt();
		int matrix1[][] = new int[rows][columns];
		int matrix2[][] = new int[rows][columns];
		int sum[][] = new int[rows][columns];
		System.out.println("Enter the elements of matrix1");
		for (  c = 0 ; c < rows ; c++ ){
			for ( d = 0 ; d < columns ; d++ ){
				matrix1[c][d] = in.nextInt();
			}
		}
		System.out.println("Enter the elements of matrix2");
		for ( c = 0 ; c < rows ; c++ ){
			for ( d = 0 ; d < columns ; d++ ){
				matrix2[c][d] = in.nextInt();
			}
		}
		for ( c = 0 ; c < rows ; c++ ){
			for ( d = 0 ; d < columns ; d++ ){
				sum[c][d] = matrix1[c][d] + matrix2[c][d];  
			}
		}
		System.out.println("Sum of entered matrices:");
		for ( c = 0 ; c < rows ; c++ ){
			for ( d = 0 ; d < columns ; d++ ){
				System.out.print(sum[c][d]+"\t");
			} 
			System.out.println();
		}
	}
}

Sample Output

Output is:
Enter the number of rows and columns of matrix
3
3
Enter the elements of matrix1
5
8
3
9
2
5
9
4
3
Enter the elements of matrix2
7
0
2
4
7
8
6
5
1
Sum of entered matrices:
12      8       5
13      9       13
15      9       4