C++動態分配二維/三維數組

 分配二維數組：  
  int   **ptr=new   int*[n1];  
  for(int   i=0;i<n1;i++)  
          ptr[i]=new   int[n2];  
   
  二維數組清除：  
  for(int   i=0;i<n1;i++)  
          delete   []ptr[i];  
  delete   []ptr;  

動態分配清除三維數組
#include<iostream>
using namespace std;
int main()
{
        //system("cp testdouble.c hehe ");
        int i,j,k;
        int r,s,t;
        cout<<"Please Enter the 1st dimension:";
        cin>>i;
        cout<<"Please Enter the 2nd dimension:";
        cin>>j;
        cout<<"Please Enter the 3rd dimension:";
        cin>>k;
        cout<<i<<'/t'<<j<<'/t'<<k<<endl;
        int ***p=new int**[i];
        for(t=0;t<i;t++)
                p[t]=new int*[j];
        for(t=0;t<i;t++)
                for(s=0;s<j;s++)
                        p[t][s]=new int[k];
        for(r=0;r<i;r++)
                for(s=0;s<j;s++)
                        for(t=0;t<k;t++)
                                p[r][s][t]=r*j*k+s*k+t;

        for(r=0;r<i;r++)
        {
                cout<<endl;
                for(s=0;s<j;s++)
                {
                        cout<<endl;
                        for(t=0;t<k;t++)
                                cout<<p[r][s][t]<<'/t';
                }
        }
        cout<<endl;

        for(r=0;r<i;r++)
                for(s=0;s<j;s++)
                        delete []p[r][s];
        for(r=0;r<i;r++)
                delete []p[r];
        delete []p;
        return 0;
}