This document contains C++ code for a student and teacher database management system. It defines classes for students and teachers with attributes like name, ID, etc. and methods to input, output, modify and delete records from data files. There are menus defined for student and teacher modules to allow adding, viewing and modifying records by interacting with text files for each. The code includes functions for reading/writing to files, getting user input, displaying output and updating records in the data files.

1. #include<iostream>
#include<conio.h>
#include<process.h>
#include<windows.h>
#include<string.h>
#include<stdio.h>
#include<fstream>
using namespace std;
void student_input(char);
void student_output(char);
void st_delete(char);
void modify(char);
void tfileinput();
void ttmodify() ;
void tfileoutput();
void tdelet();
class student
{
int rollno , year ;
// student data to be entered
long long contactno;
char name[40] , father_name[50] , gender ,course[50] ,dob[20] ,
hometown[50] ;
public:
student();
void input();
void output();
void smodify();
int getrollno();
void menu();
void displaylist();
};
class teacher
{
int teacher_id , age;
float salary;
//teacher data to be entered
char name[40] , gender , subject[70];
public:
teacher();
void input();
void output();
void tmodify();
int get_teacher_id();
void menu();
void displaylist();
};
/****************************************STUDENT
CONSTRUCTOR***************************************/
student::student()
{
rollno=year=contactno=0;
strcpy(name,"NULL");
strcpy(father_name,"NULL");
strcpy(course,"NULL");
strcpy(course,"NULL");
strcpy(dob,"NULL");
strcpy(hometown,"NULL");
gender='0';
}
/********************************************TEACHER
CONSTRUCTOR*******************************************************/
teacher::teacher()

2. {
teacher_id=age=salary=0;
strcpy(name,"NULL");
gender='0';
strcpy(subject,"NULL");
}
void display()
{
for(int i=0;i<3;i++)
{
cout<<"nnnttSTUDENT AND TEACHER DATABASEn";
cout<<"nnnntttLOADINGt";
for(int j=0;j<3;j++)
{
cout<<" . ";
Sleep(350);
}
system("cls");
}
}
/***********************************STUDENT
MENU********************************************************************/
void student::menu()
{
char c,ch,n;
system("cls");
cout<<"ntEnter year whose records to be maintainednFor First year press
1nFor Second year press 2nFor Third year press 3n";
cin>>n;
do
{
system("cls");
cout<<"ntttEnter choice:n";
cout<<"ntt1. Student Detailsn";
cout<<"ntt2. Add new recordn";
cout<<"ntt3. Modify a recordn";
cout<<"ntt4. Delete a recordn";
cout<<"ntt5. Return to main menun";
cout<<"ntt6. Exit from programn";
cin>>c;
cout<<"n";
switch(c)
{
case '1': student_output(n);
break;
case '2': student_input(n);
break;
case '3': modify(n);
break;
case '4': st_delete(n);
break;
case '5': return;
case '6': system("cls");
cout<<"nHave a nice day :)n";

3. getch();
exit(0);
}
cout<<"ntDo you want to continuen";
cin>>ch;
}while(ch=='y'||ch=='Y');
}
/***********************************TEACHER
MENU********************************************************************/
void teacher::menu()
{
char c,ch;
do
{
system("cls");
cout<<"nttEnter choice:n";
cout<<"ntt1. Teacher Detailsn";
cout<<"ntt2. Add new recordn";
cout<<"ntt3. Modify a recordn";
cout<<"ntt4. Delete a recordn";
cout<<"ntt5. Return to main menun";
cout<<"ntt6. Exit from programn";
cin>>c;cout<<"n";
switch(c)
{
case '1': tfileoutput();
break;
case '2': tfileinput();
break;
case '3': ttmodify();
break;
case '4': tdelet();
break;
case '5': return ;
case '6': system("cls");
cout<<"nHave a nice day :)n";
getch();
exit(0);
}
cout<<"ntDo you want to continuen";
cin>>ch;
}while(ch=='y'||ch=='Y');
}
void student_input(char q)
//writing student records in file
{
student s;
int n;
ofstream fout;
cout<<"nHow many records do u want to Entern";
cin>>n;
switch(q)
{
case '1':fout.open("stud1.txt",ios::app);

4. break;
case '2':fout.open("stud2.txt",ios::app);
break;
case '3':fout.open("stud3.txt",ios::app);
break;
}
while(n--)
{
s.input();
fout.write((char*)(&s),sizeof(s));
}
fout.close();
}
void tfileinput()
//writing teacher record in file
{
teacher t;
int n;
ofstream fout;
cout<<"nHow many records do u want to entern";
cin>>n;
fout.open("teacher.txt",ios::app);
while(n--)
{
t.input();
fout.write((char*)(&t),sizeof(t));
}
fout.close();
}
void student::displaylist()
//STUDENT DISPLAY LIST
{
cout<<rollno<<"tt"<<name<<"n";
}
void teacher::displaylist()
//TEACHER DISPLAY LIST
{
cout<<teacher_id<<"tt"<<name<<"n";
}
void student_output(char q)
{
system("cls");
ifstream fin;
//output
student
student s;
int f=0;
switch(q)
{
case '1': fin.open("stud1.txt");
break;
case '2': fin.open("stud2.txt");

5. break;
case '3': fin.open("stud3.txt");
break;
}
cout<<"ntttSTUDENT LISTn"<<"nRoll No. "<<"t Namen";
while(fin.read((char*)(&s),sizeof(s)))
//To print student details list
s.displaylist();
int n;
fin.close();
switch(q)
{
case '1':fin.open("stud1.txt");
break;
case '2':fin.open("stud2.txt");
break;
case '3':fin.open("stud3.txt");
break;
}
cout<<"nnttEnter Roll no. whose record you want to See ('-1' to go back
to previous menu)n";
cin>>n;
if(n==-1)
{
system("cls");
return;
}
system("cls");
while(fin.read((char*)(&s),sizeof(s)))
//To print student file details
{
if(n==s.getrollno())
{
s.output();
f=1;
}
}
if(f==0)
cout<<"nStudent record not found !!!n";
fin.close();
}
/***************************TEACHER READ FROM FILE
FUNCTION******************************************************************/
void tfileoutput()
{
system("cls");
ifstream fin;
teacher t;
int f=0;
fin.open("teacher.txt");
cout<<"ttTEACHER LISTnn";
cout<<"IDtt"<<"Namenn";
while(fin.read((char*)(&t),sizeof(t)))
t.displaylist();
int n;
fin.close();
cout<<"nnEnter Teacher ID whose record you want to see ('-1' to go back to

6. previous menu)n";
cin>>n;
if(n==-1)
{
system("cls");
return;
}
system("cls");
fin.open("teacher.txt");
while(fin.read((char*)(&t),sizeof(t)))
{
if(n==t.get_teacher_id())
{
t.output();
f=1;
}
}
if(f==0)
cout<<"nEntered ID not Foundn";
fin.close();
}
/************************************STUDENT MODIFY
FUNCTION************************************************/
void modify(char q)
{
fstream fio;
switch(q)
{
case '1':fio.open("stud1.txt");
break;
case '2':fio.open("stud2.txt");
break;
case '3':fio.open("stud3.txt");
break;
}
int no;
long pos;
student s;
char found='f';
cout<<"nntEnter the roll no. whose record is to be modified n ";
cin>>no;
fio.seekg(0);
while(!fio.eof())
{
pos=fio.tellg();
fio.read((char *)&s, sizeof(s));
if(s.getrollno()==no)
{
fio.seekg(pos);
system("cls");
s.output();
s.smodify();
fio.write((char*) &s, sizeof(s));
found='t';
break ;
}
}
if(found=='f')
cout<<"nntRecord not found !!n";
fio.close();
getch();

7. }
void student::smodify()
{
int srollno , syear ; //
temporary data storages
long long scontactno;
char sname[40] , sfather_name[50] , sgender , scourse[50] , sdob[20] ,
shometown[50] ;
cout<<"nEnter New Detailsn";
cout<<"nRoll No. (-1 to retain old one)n";
cin>>srollno;
cout<<"nName ('.' to retain old one )n";
cin.ignore(40,'n');
cin.getline(sname,40,'n');
cout<<"nFather'sName ('.' to retain old one )n";
//cin.ignore(40,'n');
cin.getline(sfather_name,40,'n');
cout<<"nDate of birth ('.' to retain old one )n";
cin.getline(sdob,20,'n');
cout<<"nGender (M/F) ('.' to retain old one )n";
cin>>sgender;
cout<<"nContact no. (-1 to retain old one)n";
cin>>scontactno;
cout<<"nCourse ('.' to retain old one )n";
cin.ignore(50,'n');
cin.getline(scourse,50,'n');
cout<<"nHometown ('.' to retain old one )n";
//cin.ignore(50,'n');
cin.getline(shometown,50,'n');
cout<<"Year (-1 to retain old one)n";
cin>>syear;
if(srollno != -1)
rollno=srollno;
if(scontactno != -1)
contactno=scontactno;
if(syear != -1)
year=syear;
if(strcmp(sname,".") != 0)
strcpy(name,sname);
if(sgender != '.')
gender=sgender;
if(strcmp(sfather_name,".") != 0)
strcpy(father_name,sfather_name);
if(strcmp(shometown,".") != 0)
strcpy(hometown,shometown);
if(strcmp(sdob,".") != 0)

8. strcpy(dob,sdob);
if(strcmp(scourse,".") != 0)
strcpy(course,scourse);
}
/*************************************************TEACHER MODIFY
FUNCTION*******************************************************/
void ttmodify()
{
system(" cls ");
fstream fio;
int no;
long pos;
teacher t;
char found='f';
fio.open("teacher.txt",ios::in|ios::out);
cout<<"nntEnter the ID whose record is to be modified n ";
cin>>no;
fio.seekg(0);
while(!fio.eof())
{
pos=fio.tellg();
fio.read((char *)&t, sizeof(t));
if(t.get_teacher_id()==no)
{
fio.seekg(pos);
system("cls");
t.output();
t.tmodify();
fio.write((char*) &t, sizeof(t));
found='t';
break ;
}
}
if(found=='f')
cout<<"nntRecord not found !!n";
fio.close();
getch();
}
void teacher::tmodify()
{
int tteacher_id , tage;
float tsalary;
//temporary teacher data to be entered
char tname[40] , tgender , tsubject[70];
cout<<"nnEnter New Detailsnn";
cout<<"Enter New Teacher ID ('-1' to retain old one )n";
cin>>tteacher_id;
cout<<"nName ('.' to retain old one )n";
cin.ignore(40,'n');
cin.getline(tname,40,'n');
cout<<"nAge ('-1' to retain old one )n";
cin>>tage;
cout<<"nEnter gender(M/F) ('.' to retain old one )n";
cin>>tgender;
cout<<"nEnter Subject ('.' to retain old one )n";

9. cin.ignore(40,'n');
cin.getline(tsubject,70,'n');
cout<<"nEnter salary ('-1' to retain old one )n";
cin>>tsalary;
if(tteacher_id != -1)
teacher_id=tteacher_id;
if(strcmp(tname,".") != 0)
strcpy(name,tname);
if(strcmp(tsubject,".") != 0)
strcpy(subject,tsubject);
if(tsalary != -1)
salary=tsalary;
if(tage != -1)
age=tage;
if(tgender != '.')
gender=tgender;
}
/*************************************STUDENT RECORD DELETE FUNCTION
FUNCTION*********************************************/
void st_delete(char q)
{
int n;
char ch,f;
student s;
ifstream fin;
ofstream fout;
fout.open("temp.txt");
switch(q)
{
case '1':fin.open("stud1.txt");
break;
case '2':fin.open("stud2.txt");
break;
case '3':fin.open("stud3.txt");
break;
}
cout<<"nEnter roll no. whose record you want to DELETEn";
cin>>n;
system("cls");
while(fin.read((char*)(&s),sizeof(s)))
{
if(n==s.getrollno())
{
f='y';
s.output();
cout<<"nCONFIRM DELETE(Y/N)n";
cin>>ch;
if(ch=='y'||ch=='Y')
{
cout<<"nRECORD DELETEDn";
getch();
continue;
}

10. }
fout.write((char*)&s,sizeof(s));
}
if(f!='y')
cout<<"nstudent record not foundn";
fin.close();
fout.close();
switch(q)
{
case '1':remove("stud1.txt");
rename("temp.txt","stud1.txt");
break;
case '2':remove("stud2.txt");
rename("temp.txt","stud2.txt");
break;
case '3':remove("stud3.txt");
rename("temp.txt","stud3.txt");;
break;
}
}
/*************************************TEACHER RECORD DELETE FUNCTION
FUNCTION*********************************************/
void tdelet()
{ int n;
char ch,f;
teacher t;
ifstream fin;
ofstream fout;
fin.open("teacher.txt");
fout.open("temp.txt");
cout<<"nttEnter Teacher id whose record you want to DELETEn";
cin>>n;
system("cls");
while(fin.read((char*)(&t),sizeof(t)))
{if(n==t.get_teacher_id())
{ f='y';
t.output();
cout<<"nCONFIRM DELETE(Y/N)n";
cin>>ch;
if(ch=='y'||ch=='Y')
{
cout<<"nRECORD DELETEDn";
getch();
continue;
}
}
fout.write((char*)&t,sizeof(t));
}
if(f!='y')
cout<<"nteacher record not foundn";
fin.close();
fout.close();
remove("teacher.txt");
rename("temp.txt","teacher.txt");
}
/**********************************STUDENT DATA INPUT
FUNCTION**************************************************************/
void student::input()
{

11. system("cls");
cout<<"Enter Roll No.n";
cin>>rollno;
cout<<"nEnter Name n";
cin.ignore(40,'n');
cin.getline(name,40,'n');
cout<<"nFather's namen";
cin.getline(father_name,50,'n');
cout<<"nEnter Date of birthn";
cin.getline(dob,20,'n');
cout<<"nEnter Gender(M/F)n";
cin>>gender;
cout<<"nEnter Contact no.n";
cin>>contactno;
cout<<"nHometownn";
cin.ignore(50,'n');
cin.getline(hometown,50,'n');
cout<<"nEnter Coursen";
cin.getline(course,50,'n');
cout<<"nEnter year of admissionn";
cin>>year;
}
/*************************************STUDENT OUTPUT
FUNCTION*******************************************/
void student::output()
{
cout<<"tttSTUDENT DETAILSn" ;
cout<<"nttRoll No.t";
cout<<rollno;
cout<<"nnttName tt";
cout<<name;
cout<<"nnttFather's namet";
cout<<father_name;
cout<<"nnttGendertt";
cout<<gender<<endl;
cout<<"nttContact No.t";
cout<<contactno;
cout<<"nnttHometownt";
cout<<hometown;
cout<<"nnttCoursett";
cout<<course<<endl;
cout<<"nttYeartt";
cout<<year<<endl;
}
/*************************************TEACHER INPUT
FUNCTION*******************************************/
void teacher::input()
{

12. system("cls");
cout<<"Enter Teacher IDn";
cin>>teacher_id;
cout<<"nEnter Name n";
cin.ignore(40,'n');
cin.getline(name,40,'n');
cout<<"nEnter agen";
cin>>age;
cout<<"nEnter gender(M/F)n";
cin>>gender;
cout<<"nEnter Subjectn";
cin.ignore(40,'n');
cin.getline(subject,70,'n');
cout<<"nEnter salaryn";
cin>>salary;
}
/*************************************TEACHER OUTPUT
FUNCTION*******************************************/
void teacher::output()
{
system("cls");
cout<<"ntttTEACHER DETAILSn";
cout<<"nttTeacher IDt"<<teacher_id;
cout<<"nnttName tt"<<name<<"n";
cout<<"nttAgett"<<age<<"n";
cout<<"nttGendertt"<<gender<<"n";
cout<<"nttSubjecttt"<<subject<<"n";
cout<<"nttSalaryttRs."<<salary<<"n";
}
int teacher::get_teacher_id()
//Reutrning teacher id
{return teacher_id;}
int student::getrollno()
//Returning student roll no.
{return rollno;}
int main() //MAIN
FUNCTION
{
display();
student s;
teacher t;
int c,ch;
do{
system("cls");
cout<<"ntttMain Menu n" ;
cout<<"nttEnter choice whose data to be maintainedn";
cout<<"ntt1. Studentn";
cout<<"ntt2. Teachern";
cout<<"ntt3. Exitn";
cin>>c;
cout<<"n";
switch(c)
{case 1:s.menu();
break;

13. case 2:t.menu();
break;
case 3:cout<<"nHave a Nice Day :)n";
getch();
exit(0);
}
}while(1);
getch();
}