Question

write a program to accept from user and print multiplication of 3x3 matrix in 2D array. Java program​

Answer 1

Answer:

import java.util.Scanner;

 

class MatrixMultiplication

{

 public static void main(String args[])

 {

   int m, n, p, q, sum = 0, c, d, k;

 

   Scanner in = new Scanner(System.in);

   System.out.println("Enter the number of rows and columns of first matrix");

   m = in.nextInt();

   n = in.nextInt();

 

   int first[][] = new int[m][n];

 

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

 

   for (c = 0; c < m; c++)

     for (d = 0; d < n; d++)

       first[c][d] = in.nextInt();

 

   System.out.println("Enter the number of rows and columns of second matrix");

   p = in.nextInt();

   q = in.nextInt();

 

   if (n != p)

     System.out.println("The matrices can't be multiplied with each other.");

   else

   {

     int second[][] = new int[p][q];

     int multiply[][] = new int[m][q];

 

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

 

     for (c = 0; c < p; c++)

       for (d = 0; d < q; d++)

         second[c][d] = in.nextInt();

 

     for (c = 0; c < m; c++) {

       for (d = 0; d < q; d++) {

         for (k = 0; k < p; k++)

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

 

         multiply[c][d] = sum;

         sum = 0;

       }

     }

 

     System.out.println("Product of the matrices:");

 

     for (c = 0; c < m; c++) {

       for (d = 0; d < q; d++)

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

 

       System.out.print("\n");

     }

   }

 }

}