Matrix Multiplication in Java

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("");

      }

    }

  }

}