C++ Tutorial/Pointer/NULL

#include <iostream.h>
int main () {
  try
  {
    char * mystring;
    mystring = new char [10];
    if (mystring == NULL) 
       throw "Allocation failure";
    
    for (int n=0; n<=100; n++)
    {
      if (n>9) 
         throw n;
      mystring[n]="a";
      
    }
  }
  catch (int i)
  {
    cout << "index " << i << " is out of range" << endl;
  }
  catch (char * str)
  {
    cout << "Exception: " << str << endl;
  }
  return 0;
}