#include
        
          using namespace std; int ROW = 5; int COL = 5; int main() {      int **a = new int*[ROW];      for(int i = 0; i < ROW; i++)          a[i] = new int[COL];      for(int r = 0; r < ROW; r++)          for(int c = 0; c < COL; c++)              a[r][c] = 6;      for(int i = 0; i < ROW; i++)      {          for(int j = 0; j < COL; j ++)              cout << a[i][j] << " ";          cout << endl;      }      for(int i = 0; i < ROW; i ++)          delete[] a[i];      delete[] a;      int **b = NULL;      b = (int**)malloc(sizeof(int*) * ROW);      for(int r = 0; r < ROW; r++)          b[r] = (int*)malloc(sizeof(int) * COL);      for(int i = 0; i < ROW; i ++)      {       for(int j = 0; j < COL; j++)          {              cout << b[i][j] << " ";          }          cout << endl;      }      for(int i = 0; i < ROW; i++)          delete[] b[i];//这里一定要释放彻底      delete[] b;     return 0;