//argv [1]: number of rows in the matrix 1 (r1)

//argv [2]: number of columns in the matrix 1 (c1)

//argv [3]: number of rows in the matrix 2 (r2)

//argv [4]: number of colums in the matrix 2 (c2)

cout << "Multiply matrix"<

cout << endl;

int * * matrix3 ;

matrix3 = new int *[r1];

for (int i = 0; i

{

*(matrix3 + i) = new int [c2]; // the column

}

for (int r3 = 0; r3 < r1; r3++)

{

for (int c3 = 0; c3 < c2; c3++)

{

int sum = 0;

for ( int a = 0; a < c1; a++)

{

sum += (*(*(matrix1 + r3) + a) * (*(*(matrix2 + a) + c3)));

}

*(*(matrix3 + r3) +c3) = sum;

cout << *(*(matrix3 + r3) + c3) << " ";

}

cout << endl;

}

Why does it not display the result for multiply matrix?