reads and writes several objects to disk : class save load « File Stream « C++ Tutorial

1. C++ Tutorial
2. File Stream
3. class save load

#include <fstream>
#include <iostream>  
using namespace std;  

class person{  
   protected:  
      char name[80];
      int age;      
   public:  
      void getData(){  
         cout << "\n   Enter name: "; cin >> name;  
         cout << "   Enter age: "; cin >> age;  
      }  
      void showData(){  
         cout << "\n   Name: " << name;  
         cout << "\n   Age: " << age;  
      }  
};
int main(){  
   char ch;  
   person pers;
   fstream file;
                
   file.open("GROUP.DAT", ios::app | ios::out |  ios::in | ios::binary );  
   do {  
      cout << "\nEnter person's data:";  
      pers.getData();             
                                  
      file.write( reinterpret_cast<char*>(&pers), sizeof(pers) );  
      cout << "Enter another person (y/n)? ";  
      cin >> ch;  
   }while(ch=='y');                  
   file.seekg(0);                 
                                  
   file.read( reinterpret_cast<char*>(&pers), sizeof(pers) );  
   while( !file.eof() ){  
      cout << "\nPerson:";     
      pers.showData();         
      file.read( reinterpret_cast<char*>(&pers), sizeof(pers) );  
   }  
   cout << endl;  
   return 0;  
}