C++ program to search a record from binary file

#include<iostream>
#include<conio.h>
#include<process.h>
#include<fstream>

using namespace std;

class rec
{
    protected:
        int roll;
        int long phon;
        char name[100];
    public:
        dis()
        {
            std::cout<<name<<"t"<<roll<<"t"<<phon<<std::endl;
        }
};

int main()
{
    int n;
    rec r;

    system("cls");

    ifstream first("new.cpp",ios::binary|ios::in);
        if(!first)
        {
            std::cout<<"File opening error"<<std::endl;
            getch();
            exit(0);
        }

    first.seekg(0);
    std::cout<<"Enter the number of record = ";
    std::cin>>n;

    long int pos = (n-1)*sizeof(r);
    first.seekg(pos);
    first.read((char *)&r, sizeof(r));
    r.dis();

    getch();
    return 0;
}

Enter rthe number of records = 2
XYZ     2   54321