C++ Project on Library

C++ Project on Library

/*
Program Title : Library
Website: http://www.cbseportal.com
There is some personal information in the introduction and end. Please remove them before use.
*/

#include
#include
#include
#include
#include
#include
#include
#include
#include

class lib
{
public:
    char name[20];
    int clas, rollno;

    void get()
    {
        cout << "******* enter the details of the student:" << endl;
        cin >> clas;
        cout << "enter the rollno:";
        cin >> rollno;
    }

    void show()
    {
        cout << "******** DETAILS ADDED ARE ***********:" << endl;
    }
};

int main()
{
    int x;
    cin >> x;
    switch (x)
    {
    case 1:
        {
            char ch = 'y';
            lib s;
            fstream t;
            t.open("navi.txt", ios::binary | ios::out | ios::app | ios::in);
            while (ch == 'y' || ch == 'Y')
            {
                s.get();
                t.write((char*)&s, sizeof(lib));
                cout << "do you want to add more(y/n)....:";
                cin >> ch;
            }
        }

    case 2:
        {
            lib s;
            fstream t;
            t.open("navi.txt", ios::binary | ios::out | ios::app | ios::in);
            t.seekg(0);
            while (t.read((char*)&s, sizeof(lib)))
            {
                s.show();
            }
        }
        break;

    case 3:
        {
            int a[20];
            lib s;
            fstream t;
            t.open("navi.txt", ios::binary | ios::out, ios::app | ios::in);
            t.seekg(0);
            cout << "enter the name you want to search:";
            cin >> a[i];
            while (t.read((char*)&s, sizeof(lib)))
            {
                s.show();
            }
            cout << "name not found:";
        }
    }
}