Matrix Multiplication Using Arrays And Loops in Java

 

Do Matrix Multiplication in Java by the help of Arrays and Loops

Answer:

I used Vs Code as IDE, you can also use Eclipse and run the code in your computer. The result Image shown at the bottom. I used 2x2 matrix, you can also use for big matrixes, and remember that first matrix column must be equal with the rows of second matrix.

import java.util.Scanner;

public class Ques4 {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        System.out.println("Please Enter Dimension");

        System.out.println("In Matrix multiplication rows and columns must be same!");

        int rows = sc.nextInt();

        int cols = sc.nextInt();

        int a[][] = new int[rows][cols];

        int b[][] = new int[rows][cols];

        System.out.println("Enter array A");

        for(int i = 0; i< rows; i++){

            for(int j = 0; j< cols; j++){

                a[i][j] = sc.nextInt();

            }

        }

        System.out.println("Enter array B");

        for(int i = 0; i< rows; i++){

            for(int j = 0; j< cols; j++){

                b[i][j] = sc.nextInt();

            }

        }

        int c[][] = new int[rows][cols];

        for(int i = 0; i<rows; i++){

            for(int j = 0; j<cols; j++){

                c[i][j] = a[i][j] * b[j][i] +  a[i][j] * b[j][i];

            }

        }

        System.out.println("Matrix multiplication result C is");

        System.out.println("Result array C");

        for(int i = 0; i< rows; i++){

            for(int j = 0; j< cols; j++){

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

            }

            System.out.println();

        }

        sc.close();

    }

    

}