C++ program to create a file in binary mode and then put data in that file

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

using namespace std;


class rec
{
    private:
        int roll;
        int long phon;
        char name[100];
    public:
        input()
        {
            std::cout<<"Enter the name = ";
            std::cin>>name;
            std::cout<<"Enter the roll # = ";
            std::cin>>roll;
            std::cout<<"Enter the phone # = ";
            std::cin>>phon;
        }
};

int main()
{
    system("cls");
    char na[100];
    char ch;

    ch = 'y';
    rec r;

    std::cout<<"Enter the file name = ";
    std::cin>>na;

    ofstream add(na,ios::binary | ios::app);

    while(ch!='n')
    {
        r.input();
        add.write((char *)&r, sizeof(r));

        std::cout<<"Do you enter new record (Y/N) = ";
        std::cin>>ch;
    }

    getch();
    return 0;
}

Enter the file name = temp.bin
Enter the name = ABC
Enter the roll # = 1
Enter the phone # = 12345
Do you entr new recored (Y/N) = y
Enter the name = XYZ
Enter the roll # = 2
Enter the phone # = 54321
Do you enter new recored (Y/N) = n