Thread: overloaded <<

Code:

// Object definition
...
int     name;
void* hook;  //the variable that holds the info
...
std::istream &operator>>(std::istream &stream, Object &o)
{
  char temp[100];

  stream >> name;
  stream.getline(temp, 100);
  o.hook = &temp;
  // the following gives the output I want 
  std::cout << reinterpret_cast<const char *>(o.hook);
  return stream;
}

std::ostream &operator<<(std::ostream &stream, const Object &o)
{
  stream << name;
  stream << reinterpret_cast<const char *>(o.hook);

  return stream;
}

// Main program
...
Object object;
...
//the following gives garbage for "hook" only
std::cout << object;

What causes the problem above?