C++指向指针的指针

#include <iostream>

using namespace std;

int main () {
   int  var;
   int  *ptr;
   int  **pptr;

   var = 3000;

   // take the address of var
   ptr = &var;

   // take the address of ptr using address of operator &
   pptr = &ptr;

   // take the value using pptr
   cout << Value of var : << var << endl;
   cout << Value available at *ptr : << *ptr << endl;
   cout << Value available at **pptr : << **pptr << endl;

   return 0;
}