C++ Program to implement File Handling by using ifstream & ofstream

Get the Rollno, Names and Marks Obtained of N students. The data should be stored in “RESULT” data file.
Use the same file to print the result along with aggregate percentage for all the students.

#include
#include
#include

class Cstud{
    private:
        char name[10];
        int roll, marks;
    public:
        void getdata();
        void putdata();
        int calc() const;
    };

void Cstud :: getdata(){
    cout<<"\n Enter Name: ";
    cin>>name;
    cout<<"\n Enter Roll No: ";
    cin>>roll;
    cout<<"\n Enter Marks: ";
    cin>>marks;
    }

int Cstud :: calc() const{
    return marks;
    }

void Cstud :: putdata(){
    cout<<"\n Name: "<    cout<<"\n Roll No: "<    cout<<"\n Marks: "<    }

void main(){
    int n, tot, avg;
    Cstud Ostu1, Ostu2;
    clrscr();
    cout<<"\n How many Students: ";
    cin>>n;
    ofstream fout;
    fout.open("result.txt", ios::out);
    for(int i=0; i        cout<<"\n Student No: "<        Ostu1.getdata();
        fout.write((char *) &Ostu1, sizeof(Ostu1));
        }
    fout.close();

    ifstream fin;
    fin.open("result.txt", ios::in);
    tot = 0;
    clrscr();
    cout<<"\n Data read from File:- \n";
    for(i=0; i        fin.read((char *) &Ostu2, sizeof(Ostu2));
        cout<<"\n\n Student No: "<        Ostu2.putdata();
        tot += Ostu2.calc();
        }
    avg = tot/n;
    cout<<"\n\n Total marks: "<    cout<<"\n\n Average Marks: "<    fin.close();
    getch();
    }