seeks particular person in file : Binary File « File « C++

1. C++
2. File
3. Binary File

seeks particular person in file

  
#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(void){  
           cout << "\n   Name: " << name;  
           cout << "\n   Age: " << age;  
        }  
  };  
  int main(){  
     person pers;
     ifstream infile;
     infile.open("GROUP.DAT", ios::in | ios::binary);
    
     infile.seekg(0, ios::end);     
     int endposition = infile.tellg();        
     int n = endposition / sizeof(person);    
     cout << "\nThere are " << n << " persons in file";  
    
     cout << "\nEnter person number: ";  
     cin >> n;  
     int position = (n-1) * sizeof(person);  
     infile.seekg(position);        
                                    
     infile.read( reinterpret_cast<char*>(&pers), sizeof(pers) );  
     pers.showData();               
     cout << endl;  
     return 0;  
     }
  
    
  

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