struct Matrix{
    int nrows;
    int ncols;
    int** matrix;
};

struct Matrix init_matrix(int r, int c)
{
    struct Matrix mat;
    mat.nrows = r;
    mat.ncols = c;
    mat.matrix = calloc(r, sizeof(int *));
    for(int i = 0; i < r; ++i)
    {
        *(mat.matrix+i) = calloc(c, sizeof(int));
    }

    return mat;
}

void free_matrix(struct Matrix mat)
{
    int top = mat.nrows;
    for(int i = 0; i < top; ++i)
    {
        free(mat.matrix[i]);
    }
    free(mat.matrix);
}

3 3
1 2 3
4 5 6
7 8 9

int main(int argc, char *argv[])
{
    struct Matrix mat1 = create_matrix();
    char operation = get_operation();
    struct Matrix mat2 = create_matrix();
    struct Matrix result = compute(mat1,mat2, operation);
    return 0;
}