How to create a database in C++ using file handling

#include<stdio.h>

#include<iostream.h>

#include<conio.h>

#include<fstream.h>

#include<string.h>

#include<stdlib.h>

#include<iomanip.h>

class date

{

int dd,mm,yy;

public:

void setdate()

{

cout<<"\nEnter date(dd): ";

cin>>dd;

cout<<"\nEnter month(mm): ";

cin>>mm;

cout<<"\nEnter year(yyyy): ";

cin>>yy;

}

void dispdate()

{

cout<<"Entered Date is "<<dd<<"-"<<mm<<"-"<<yy;

}

};

class patient

{

public:

char name[30];

date doa;

char disease[30];

char add[50];

long int phn;

date dod;

void patientdata()

{

cout<<"\n\t\t\tCreate New Patient Database";

cout<<"\n\t\t--------------------------------------------";

cout<<"\nEnter Name: ";

cin>>name;

cout<<"\nEnter Date of Admission:";

doa.setdate();

cout<<"\nEnter Disease ";

cin>>disease;

cout<<"Enter Address: ";

cin>>add;

cout<<"\nEnter Contact No. ";

cin>>phn;

cout<<"\nEnter Date of Discharge:";

dod.setdate();

}

void disp()

{

cout<<"\nPatient Name: "<<name;

cout<<"\nDate of Admission of Patient is:\n";

doa.dispdate();

cout<<"\nPatient Disease: "<<disease;

cout<<"\nPatient Address: "<<add;

cout<<"\nPatient Contact No.: "<<phn;

cout<<"\nDate of Discharge of Patient is:\n";

dod.dispdate();

}

};

class age:public patient

{

public:

int ag;

void page()

{

cout<<"\nEnter Patient Age: ";

cin>>ag;

}

void display()

{

cout<<"\nPatient Age: "<<ag;

}

};

void main()

{

clrscr();

patient p;

age a;

char s;

z:

clrscr();

fstream f;

f.open("patient.txt",ios::in|ios::out|ios::app||ios::ate);

cout<<"\n---------------------------------------------------";

cout<<"\n\t\tHospital Management";

cout<<"\n---------------------------------------------------";

cout<<"\n1. Enter Patient Data\n2. Display Patient Data\n3. Search by Disease\n4. Exit";

int ch;

cout<<"\nEnter your choice ";

f.seekg(0);

cin>>ch;

char x;

switch(ch)

{

case 1:clrscr();

       fstream ft;

       ft.open("patient.txt",ios::in|ios::out|ios::ate|ios::app);

       char ans;

       a.patientdata();

       a.page();

       ft.write((char *)&a,sizeof(a));

       getch();

       cout<<"\nDo you want to continue(y/n) ";

       cin>>ans;

       if(ans=='Y'||ans=='y')

       {

       goto z;

       }

       else

       {

       break;

       }

case 2:clrscr();

       fstream fs;

       fs.open("patient.txt",ios::in|ios::out|ios::ate|ios::app);

       char answ;

       fs.seekg(0);

       int ctr=0;

       while(fs.read((char *)&a,sizeof(a)))

       {

       a.disp();

       a.display();

       if(fs.eof()==1)

       {

       break;

       }

       }

       f.close();

       cout<<"Do you want to continue(y/n) ";

       answ=getchar();

       if(answ=='Y'||answ=='y')

       goto z;

       else

       {

       exit(1);

       }

       break;

case 3:clrscr();

       cout<<"\t\t-------------------------";

       cout<<"\n\t\t\tSearch Patient";

       cout<<"\n\t\t-------------------------";

       fstream sf;

       age aobj;

       char disease[30];

       char answer;

       sf.open("patient.txt",ios::in);

       cout<<"\nEnter patient disease ";

       cin>>disease;

       do

       {

       sf.read((char *)&aobj,sizeof(aobj));

       if(sf.eof()==1)

       {

       break;

       }

       if(strcmp(aobj.disease,disease)==0)

       {

       cout<<"\nPatient Name: "<<aobj.name;

       cout<<"\nPatient Address: "<<aobj.add;

       cout<<"\nPatient Phone: "<<aobj.phn;

       cout<<"\nPatient Age: "<<aobj.ag;

       sf.close();

       }

       else

       {

       cout<<"\nPatient does not exist";

       }

       }while(sf);

       cout<<"\nDo you want to continue(y/n) ";

       answer=getchar();

       if(answer=='Y'||answer=='y')

       {

       goto z;

       }

       break;

case 4:exit(1);

}

getch();

}