File Stream C++ Tutorial

#include 
#include 
using namespace std;
class Animal
{
public:
   Animal(int weight, long days):itsWeight(weight),itsNumberDaysAlive(days){}
   ~Animal(){}
   int GetWeight()const { return itsWeight; }
   void SetWeight(int weight) { itsWeight = weight; }
   long GetDaysAlive()const { return  itsNumberDaysAlive; }
   void SetDaysAlive(long days) { itsNumberDaysAlive = days; }
private:
   int itsWeight;
   long itsNumberDaysAlive;
};
int main(){
   ofstream fout("text.txt",ios::binary);
   if (!fout)
   {
      cout << "Unable to open for writing.\n";
      return(1);
   }
   Animal Bear(50,100);
   fout.write((char*) &Bear,sizeof Bear);
   fout.close();
   ifstream fin("text.txt",ios::binary);
   if (!fin)
   {
      cout << "Unable to open for reading.\n";
      return(1);
   }
   Animal BearTwo(1,1);
   cout << "BearTwo weight: " << BearTwo.GetWeight() << endl;
   cout << "BearTwo days: " << BearTwo.GetDaysAlive() << endl;
   fin.read((char*) &BearTwo, sizeof BearTwo);
   cout << "BearTwo weight: " << BearTwo.GetWeight() << endl;
   cout << "BearTwo days: " << BearTwo.GetDaysAlive() << endl;
   fin.close();
   return 0;
}