Dev - C++ - ayuda con trabajo de la universidad

#include <iostream>

#include <iomanip>

using namespace std;

int main(int argc, char **argv) {

	int A[3][3] = {

                  {4,9,19},

                  {1,11,24},

                  {7,8,3}

                };

  int B[3][3] = {

                  {15,22,4},

                  {2,9,17},

                  {4,2,8}

                };

  int j,i,C[3][3];

  //C = A - B

  for (i=0; i<3; i++)

    for (j=0; j<3; j++)

      C[i][j] = A[i][j] - B[i][j];

  //Mostrar C = A - B

  cout << "C = A - B" << endl;

  for (i=0; i<3; i++) {

    for (j=0; j<3; j++) {

      cout << setw(5);

      cout << C[i][j] << "\t";

    }

    cout << endl;

  }

  //C = B - A

  cout << endl;

  for (i=0; i<3; i++)

    for (j=0; j<3; j++)

      C[i][j] = B[i][j] - A[i][j];

  //Mostrar C = B - A

  cout << "C = B - A" << endl;

  for (i=0; i<3; i++) {

    for (j=0; j<3; j++) {

      cout << setw(5);

      cout << C[i][j] << "\t";

    }

    cout << endl;

  }

  //C = 2A + 3B

  for (i=0; i<3; i++)

    for (j=0; j<3; j++)

      C[i][j] = 2 * A[i][j] + 3 * B[i][j];

  //Mostrar C = 2A + 3B

  cout << "C = 2A + 3B" << endl;

  for (i=0; i<3; i++) {

    for (j=0; j<3; j++) {

      cout << setw(5);

      cout << C[i][j] << "\t";

    }

    cout << endl;

  }

	return 0;

}