Matrix addition in Java

class AddTwoMatrix
{
  public static void main(String args[])
  {
    int m, n, c, d;
    Scanner in = new Scanner(System.in);

    System.out.println("Enter the number of rows and columns of matrix");
    m = in.nextInt();
    n = in.nextInt();

    int first[][] = new int[m][n];
    int second[][] = new int[m][n];
    int sum[][] = new int[m][n];

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

    for (c = 0 ; c < m; c++)
      for (d = 0 ; d < n; d++)
        second[c][d] = in.nextInt();

    for (c = 0; c < m; c++)
      for (d = 0; d < n; d++)
        sum[c][d] = first[c][d] + second[c][d];  //replace '+' with '-' to subtract matrices

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

    for (c = 0; c < m; c++)
    {
      for (d = 0; d < n; d++)
        System.out.print(sum[c][d] + "\t");

      System.out.println();
    }
  }
}