C++ program to open a file in binary mode and count the total records

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

using namespace std;

class rec
{
    protected:
        int roll;
        int long phon;
        char name[100];
};

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,ios::end);
    int endpos = first.tellg();
    n = endpos/sizeof(r);

    std::cout<<"The number of records = "<<n;

    getch();
    return 0;
}

The number of records = 5