14th

#include<iostream>
#include<conio.h>
#include<fstream>
using namespace std;
class student
{
	int marks,rollno;
	char name[30];
	public:
	void getdata()
	{
		cout<<"Enter roll no.: ";
		cin>>rollno;
		cout<<"Enter name: ";
		cin.ignore();
		gets(name);
		cout<<"Enter marks: ";
		cin>>marks;
	}
	void display()
	{
		cout<<"Roll No.: "<<rollno<<endl;
		cout<<"Name : "<<name<<endl;
		cout<<"Marks :"<<marks<<endl;
	}
};
main()
{
	student s1[10],s2[10];
	fstream f;
	cout<<"Enter no. students :";
	int n;
	cin>>n;
	f.open ("qwerty.txt", ios::binary |  ios::in | ios::out|ios::trunc);
	if(!f.is_open())
	{
		cout<<"not found";
	}
	for(int i=0;i<n;i++)
	{
		s1[i].getdata();
		f.write((char*) &s1[i], sizeof(student));

	}
	f.seekg(0);
	char ch;
	for(int i=0;i<n;i++)
	{
		f.read((char*) &s2[i], sizeof(student));
		s2[i].display();
	}
	f.close();

getch();
}