#include <bits/stdc++.h>     /* malloc, calloc, realloc, free */
using namespace std;
int main ()
{
  int * buffer1, * buffer2, * buffer3;
  buffer1 = (int*) malloc (100*sizeof(int));
  *buffer1 = 50;
  buffer2 = (int*) calloc (100,sizeof(int));
  buffer3 = (int*) realloc (buffer2,500*sizeof(int));
  cout<<buffer1<<endl; cout<<*buffer1<<endl;
  free (buffer1);
  free (buffer3);
  cout<<buffer1<<endl;
  cout<<*buffer1<<endl;
  return 0;
}
 

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