This project report describes a telephone billing system that allows users to add, modify, delete, display, and list customer records stored in a file. The system calculates telephone bills based on the number of calls, customer type (residential or office), and applies taxes and late fees. It uses classes and functions to manage input/output with data files and provide a menu-driven interface for common operations like viewing bills, modifying customer data, and generating reports of all customers.

1. ……………………………………………………..
………………………………………………..……
Project Report
On
TELEPHONE BILLING
SYSTEM
In the partial fulfillment of All India Senior School
Certificate Examination for the session ……………..
conducted by Central Board Of Secondary Education.
…………………….
CLASS--…………

2. ACKNOWLEDGEMENT
I would like to convey my heartful thanks to
……………….. (Computer Science) who always gave
valuable suggestions & guidance for completion of my
project.
He helped me to understand & remember important
details of the project. My project has been a success
only because of his guidance.
I am especially indented & I am also beholden to my
friends. And finally I thank to the members of my
family for their support & encouragement.

3. CERTIFICATE
This is to certify that ……………….. of class
……… of
…………………………………………………
… has completed her project under my
supervision. She has taken proper care & shown
sincerity in completion of this project.
I certify that this project is up to my
expectation & as per the guideline issued by
CBSE.
…………………………….
(Computer Science faculty )

4. Content
1. Introduction
2. Source Code
3. Output
4. Requirement
5. Advantages and disadvantages
6. Conclusion
7. System design

5. This project TELEPHONE BILLING SYSTEM includes some facilities
of travel such as registration, search, display, modification,
delete etc. This software searches the client data which is store
in the record.
The software used for small schools for maintaining there
records related to library and cost savings.

7. //***************************************************************
// HEADER FILE USED IN PROJECT
//****************************************************************
#include <process.h>
#include <ctype.h>
#include <dos.h>
#include <dir.h>
#include <fstream.h>
void show()
{
clrscr();
gotoxy(1,5);
cout<<"**************************WELCOME TO MY PROJECT*******************************";
gotoxy(1,8);
cout<<"**********************************ON******************************************";
gotoxy(1,10);
cout<<" *********************TELEPHONE BILLING**************************";
gotoxy(1,20);
cout<<"------SUBMITTED BY: …………………………………………--------";
gotoxy(1,22);
cout<<"------…………………………………………………………………….”;
gotoxy(15,24);
cout<<"---------------PRESS ANY KEY-----------------------";
getch();
clrscr();
}
//***************************************************************
// CLASS USED IN PROJECT
//****************************************************************
// CLASS HAVING THE RECORD OF CUSTOMER
class customer
{ char name[30];
char add[40];
char ph[15];
char type;
public :
void append();
void display();
void deleter();
void modify();
void list();
void help();
}cust;
// FUNCTION TO DISPLAY THE MESSAGE AT THE BOTTOM OF THE SCREEN
void message(char mess[80])
{
int l,d;
l=strlen(mess);
d=l/2;

8. gotoxy(2,24);
//textcolor(WHITE+BLINK);
//textbackground(BLACK);
cout<<" ";
gotoxy(40-d,24);
clrscr();
cout<<mess;
//textcolor(BLACK);
//textbackground(WHITE);
}
// MAIN FUNCTION HAVING THE MAIN MENU
void main()
{
//textcolor(BLACK);
//textbackground(WHITE);
show();
char ch,ch1;
while(1)
{
clrscr();
gotoxy(1,2);
cout<<"*******************************************************************************";
gotoxy(25,4);
cout<<"MAHANAGAR TELEPHONE NIGAM LTD.";
gotoxy(1,6);
cout<<"*******************************************************************************";
gotoxy(25,8);
cout<<" D - Display a Bill";
gotoxy(25,10);
cout<<" L - List of customers";
gotoxy(25,12);
cout<<" H - Help";
gotoxy(25,14);
cout<<" M - Modify a record";
gotoxy(25,16);
cout<<" Q - Quit";
gotoxy(30,18);
cout<<"Select Your Choice:";
//message("Select your choice");
gotoxy(50,18);
ch =getch();
ch = toupper(ch);
switch(ch)
{
case ('Q') : //textcolor(WHITE);
//textbackground(BLACK);
clrscr();
gotoxy(25,30);
cout<<"***********THANKS FOR WATCHING****************";
exit(1);
case ('D') : cust.display();
break;

9. case ('L') : cust.list();
break;
case ('H') : cust.help();
break;
case ('M') :
ch1 = 'A' ;
while(ch1 != 'Q')
{
clrscr();
gotoxy(1,2);
cout<<"*******************************************************************************";
gotoxy(25,4);
cout<<"MAHANAGAR TELEPHONE NIGAM LTD.";
gotoxy(1,6);
cout<<"*******************************************************************************";
gotoxy(25,9);
cout<<" A - Append a record";
gotoxy(25,11);
cout<<" D - Delete a record";
gotoxy(25,13);
cout<<" M - Change a record";
gotoxy(25,15);
cout<<" Q - Quit";
gotoxy(30,18);
cout<<"Select your option";
gotoxy(50,18);
ch1 = getch();
ch1 = toupper(ch1);
switch(ch1)
{
case ('A') : cust.append();
break;
case ('D') : cust.deleter();
break;
case ('M') : cust.modify();
break;
}
}
}
}
}
// FUNCTION TO ADD THE CUSTOMER RECORD IN THE FILE
void customer :: append()
{
char choice;
fstream fp;
fp.open("tphone.dat",ios::out);
if (!fp)
{
cout<<"Unable to open FILE.";
getch();
return;
}
while(1)
{

10. clrscr();
gotoxy(3,3);
cout<<"Customer Record #";
cout<<"Enter the customer record";
while(1)
{
cout<<"Enter the name";
gotoxy(3,5);
cout<<"Name : ";
gotoxy(25,5);
cin>>name;
if(strlen(name)==0)
{
gotoxy(2,23);
clrscr();
//textcolor(WHITE+BLINK);
//textbackground(BLACK);
cout<<"Name cannot be left blanka";
//textcolor(BLACK);
}
else
break;
}
while(1)
{
cout<<"Enter the address";
gotoxy(3,6);
cout<<"Address : ";
gotoxy(25,6);
gets(add);
if (strlen(add) != 0)
break;
}
while(1)
{
gotoxy(3,7);
cout<<"Assigned Ph. No. : ";
gotoxy(25,7);
cin>>ph;
if (ph != 0 )
break;
else
{
gotoxy(25,7);
clrscr();
}
}
cout<<"Enter O for Office and R for residential phone";
gotoxy(3,8);
cout<<"catagory ( O/R ) : ";
cin>>type;
gotoxy(4,10);
cout<<"1 : Save & Exit 2 : Save & Cont. 0 : Exit without save";
gotoxy(4,11);
cout<<"? ";
cin>>choice;
switch(choice)
{

11. case ('1') : fp.write((char *) this,sizeof(cust));
fp.close();
return;
case ('2') : fp.write((char *) this,sizeof(cust));
break;
case ('0') : fp.close();
return;
default : fp.close();
return;
}
}
}
// FUNCTION TO DISPLAY THE CUSTOMER RECORD AND CALCULATE THE BILL
void customer :: display()
{
char p[10];
char choice=NULL;
int found=0;
int no;
float bill=0.0, tax=0.0, fine=0.0, bbill=0.0, abill=0.0;
fstream fp;
fp.open("tphone.dat", ios::in);
if (!fp)
{
cout<<"Unable to open a file";
getch();
fp.close();
return;
}
while(choice != '0')
{
clrscr();
gotoxy(3,20);
cout<<"Please enter the Phone No. ";
cin>>p;
if (!strcmp(p,"0"))
return;
found = 0;
fp.seekg(0);
while (fp.read((char *)this ,sizeof(cust)))
{
if (found==1)
break;
if (!strcmp(ph,p))
{
clrscr();
gotoxy(1,1);
cout<<"*******************************************************************************";
gotoxy(28,2);
cout<<"MAHANAGAR TELEPHONE BILL";
gotoxy(1,3);
cout<<"*******************************************************************************";
gotoxy(3,4);
cout<<"Name : ";
cout<<name;
gotoxy(35,5);

12. cout<<"Address : ";
cout<<add;
gotoxy(35,4);
cout<<"Assigned Ph. No. : ";
cout<<ph;
gotoxy(3,5);
cout<<"Catagory ( O/R ) : ";
cout<<type;
gotoxy(1,6);
cout<<"===========================================================================";
gotoxy(23,8);
cout<<"___________";
gotoxy(10,8);
cout<<"No. of calls ";
cin>>no;
if ( no <= 150 )
bill = 0 ;
else
{
no = no - 150;
if (toupper(type) == 'O')
bill = no * 1.00 ;
else
bill = no * .80;
}
gotoxy(10,9);
cout<<"Bill";
gotoxy(70,9);
cout<<bill;
tax = (5*bill)/100;
gotoxy(10,10 );
cout<<"5% Tax";
gotoxy(70,10);
cout<<tax;
gotoxy(10,11);
cout<<"Duties";
gotoxy(70,11);
cout<<"100";
int dd,mm,yy;
struct date d; // Getting system Date
getdate(&d);
dd = d.da_day;
mm = d.da_mon;
yy = d.da_year;
gotoxy(1,13);
cout<<"===========================================================================";
gotoxy(10,15) ;
cout<<"TOTAL BILL before " ;
cout<<dd<<"/"<<mm<<"/"<<yy;
bbill = bill+tax+100;
gotoxy(70,15);
cout<<bbill;
gotoxy(1,16);
cout<<"===========================================================================";
gotoxy(10,17);
cout<<"Late Fine";
fine = (bbill*5)/100;
gotoxy(70,17);

13. cout<<fine;
gotoxy(10,21);
cout<<"TOTAL BILL after ";
cout<<dd<<"/"<<mm<<"/"<<yy;
abill = bbill+fine;
gotoxy(70,21);
cout<<abill;
found = 1;
gotoxy(10,23);
cout<<"*************************Press a Key********************************";
getch();
}
}
cout<<"Enter 1 or 2 to cont.";
gotoxy(4,22);
cout<<"1 : Cont. 0 : Exit ";
cout<<"? ";
cin>>choice;
switch(choice)
{
case ('1') :
break;
case ('0') : return;
default : return;
}
}
fp.close();
}
// FUNCTION TO DISPLAY THE LIST OF THE CUSTOMERS
void customer :: list()
{
clrscr();
fstream fp;
int r;
fp.open("tphone.dat", ios::in);
if (!fp)
{
cout<<"Unable to open";
getch();
fp.close();
return;
}
gotoxy(35,2);
cout<<"List of Customers";
gotoxy(35,3);
cout<<"*****************";
gotoxy(5,4);
cout<<"Name";
gotoxy(40,4);
cout<<"Phone No.";
gotoxy(65,4);
cout<<"Catagory";
gotoxy(1,5);
cout<<"*******************************************************************************";
r=6;
while (fp.read((char *) this, sizeof(cust)))

14. {
if (r >= 21)
{
cout<<"Press a key";
getch();
clrscr();
gotoxy(35,2);
cout<<"List of customers";
gotoxy(35,3);
cout<<"*****************";
gotoxy(5,4);
cout<<"Name";
gotoxy(40,4);
cout<<"Phone No.";
gotoxy(65,4);
cout<<"Catagory";
gotoxy(1,5);
cout<<"*******************************************************************************";
r=6;
}
gotoxy(5,r);
cout<<name;
gotoxy(40,r);
cout<<ph;
gotoxy(65,r);
if (toupper(cust.type) == 'O')
cout<<"Office";
else
cout<<"Residential";
r++;
}
gotoxy(1,r);
cout<<"*******************************************************************************";
gotoxy(35,r+1);
cout<<"Press a key";
getch();
fp.close();
}
// FUNCTION TO DELETE THE RECORD OF CUSTOMER FROM THE FILE
void customer :: deleter()
{
char ch;
char p[10];
fstream temp,fp;
fp.open("tphone.dat", ios::in);
if (!fp)
{
cout<<"Unable to open Telephone file";
getch();
fp.close();
return;
}
temp.open("temp.dat", ios::out);
if (!temp)
{

15. cout<<"Unable to open Temporary file";
getch();
temp.close();
return;
}
clrscr();
gotoxy(5,3);
cout<<"Enter the Phone No. to be deleted : ";
cin>>p;
if(!strcmp(p,"0"))
return;
int found=0;
while (fp.read((char *) this, sizeof(cust)))
{
if (!strcmp(p,ph))
{
found = 1;
gotoxy(5,5);
cout<<"Name "<<name;
gotoxy(5,6);
cout<<"Address " <<add;
gotoxy(5,7);
cout<<"Catagory "<<type;
gotoxy(6,10);
cout<<"Delete this record (Y/N) ";
cin>>ch;
if (toupper(ch) == 'N')
temp.write((char *) this,sizeof(cust));
}
else
temp.write((char *) this,sizeof(cust));
}
fp.close();
temp.close();
if (toupper(ch) == 'N')
return;
if (!found)
{
cout<<"nnTelephone no. not found";
getch();
return;
}
fp.open("tphone.dat", ios::out);
temp.open("temp.dat", ios::in);
while (temp.read((char *) this, sizeof(cust)))
fp.write((char *) this, sizeof(cust));
fp.close();
temp.close();
}
// FUNCTION TO MODIFY THE RECORD OF CUSTOMER FROM THE FILE
void customer :: modify()
{
char ch;
char p[10];
fstream temp,fp;

16. fp.open("tphone.dat", ios::in);
if (!fp)
{
cout<<"Unable to open Telephone file";
getch();
fp.close();
return;
}
temp.open("temp.dat", ios::out);
if (!temp)
{
cout<<"Unable to open Temporary file";
getch();
temp.close();
return;
}
clrscr();
gotoxy(5,3);
cout<<"Enter the Phone No. to be Modify : ";
cin>>p;
if(!strcmp(ph,"0"))
return;
int found=0;
while (fp.read((char *) this, sizeof(cust)))
{
if (!strcmp(p,ph))
{
found = 1;
gotoxy(5,5);
cout<<"Name "<<name;
gotoxy(5,6);
cout<<"Address " <<add;
gotoxy(5,7);
cout<<"Catagory "<<type;
gotoxy(6,10);
cout<<"Modify this record (Y/N) ";
cin>>ch;
if (toupper(ch) == 'Y')
{
gotoxy(3,13);
cout<<"Customer Record #";
cout<<"Enter the customer record";
while(1)
{
gotoxy(3,15);
cout<<"Name : ";
gets(name);
if (strlen(name) != 0)
break;
}
gotoxy(3,16);
cout<<"Address : ";
gets(add);
while(1)
{
gotoxy(3,17);
cout<<"Assigned Ph. No. : ";
cin>>ph;

17. if (ph != 0 )
break;
}
cout<<"Enter O for Office and R for residential phone";
gotoxy(3,18);
cout<<"catagory ( O/R ) : ";
cin>>type;
}
}
temp.write((char *) this,sizeof(cust));
}
fp.close();
temp.close();
if (toupper(ch) == 'N')
return;
if (!found)
{
cout<<"nnTelephone no. not found";
getch();
return;
}
fp.open("tphone.dat", ios::out);
temp.open("temp.dat", ios::in);
while (temp.read((char *) this, sizeof(cust)))
fp.write((char *) this, sizeof(cust));
fp.close();
temp.close();
}
// FUNCTION TO DISPLAY THE DISCRIPTION FOR THE PROJECT WORKING
void customer :: help()
{
clrscr();
gotoxy(35,2);
cout<<" HELP ";
gotoxy(8,5);
cout<<"This software is used to create a telephone bill for the customers. ";
gotoxy(8,7);
cout<<"There are two catagories of the customers. First catagories is of";
gotoxy(8,9);
cout<<"Residential phones and second catagories is of Office phones. Both";
gotoxy(8,11);
cout<<"the catagories have different charges of the telephone bill. Charges";
gotoxy(8,13);
cout<<"of residential phones are 80 Paise per call and Charges of Office ";
gotoxy(8,15);
cout<<"office phones are Rs. 1 per call. 150 call are free for each catogory";
gotoxy(8,17);
cout<<"Total bill for is equal to 5% tax plus 100 rupees charges for other";
gotoxy(8,19);
cout<<"charges. If bill is not paid before the paticular date then penalty ";
gotoxy(8,21);
cout<<"should also be given.";
getch();
}

18. IF CHOICE IS 'M'

19. IF CHOICE IS 'A' NEW RECORD OF CUSTOMER IS ADDED
IF CHOICE IS 'M' MODIFY THE RECORD OF CUSTOMER
IF CHOICE IS 'D' DELETE THE RECORD OF CUSTOMER IS ADDED
IF CHOICE 'L' IS SELECTED:
CUSTOMER LIST
*******************************************************************************
NAME ADDRESS PHONE NUMBER
*******************************************************************************
ABC XXXXXX 5656XXXXXX
XYZ HXXXXX 8958XXXXXX
******************************************************************************
IF CHOICE 'D' IS SELECTED:
Please enter the phone number:5656xxxxxxx

20. REQUIREMENTS
HARDWARE REQUIRED
• Printer, to print the required documents of the project
• Compact Drive
• Processor : intel
• Ram : 512 MB or more than 512MB
• Harddisk : 80 GB or more than 80GB.
SOFTWARE REQUIRED
• Operating system : Windows XP
• Turbo C++, for execution of program and Ms word, for
presentation of output.

21. ADVANTAGES
• It allows effective and easy management of customers' payments in a quick and timely manner. Any
inefficiency should be greatly reduced.
• The system can be custom built to suit the specific needs of the company. This further allows for a smooth
billing process.
• A reduction in human error will occur. This should reduce cost and time spent correcting errors.
• All these benefits combined mean that in the long run a computerised billing system should be more cost
effective for a business when compared to a manual one.
DISADVANTAGES
• The initial cost of installing the system can be high - especially if the business requires extra features added
to the software.
• There can also be other unforeseen costs - staff training, for instance.
• As with all computer systems, there is always the chance of associated hardware and/or software problems.
Data can be lost through power failures or accidental deletion. Problems can also occur with viruses,
hacking and fraud.
• Online facility is not available.

22. CONCLUSION
After entering into the project, user is left with several options via –
a) The user can take new connections.
b) The user can view the existing lists of customers, which already have telephone
connections.
c) The user can of course see bills & take billing statements.
d) The user can also do several administrative works like managing rates of calls,
addition or modification of metered calls & customer entries.
It is a computerized system, which can be used very easily & effectively by the
administrators of the telephone billing system.

23. SYSTEM DESIGN
Then we began with the design phase of the system. System design is a solution, a
“HOW TO” approach to the creation of a new system. It translates system
requirements into ways by which they can be made operational. It is a
translational from a user oriented document to a document oriented
programmers. For that, it provides the understanding and procedural details
necessary for the implementation. Here we use Flowchart to supplement the
working of the new system. The system thus made should be reliable, durable and
above all should have least possible maintenance costs. It should overcome all the
drawbacks of the Old existing system and most important of all meet the user
requirements.
START
MAHANAGAR TELEPHONE NIGAM
D DISPLAY ABILL
L LIST OF CUSTOMERS
M RECORDS OF CUSTOMER
Q QUIT
IF CHOICE = 'D
IF CHOICE= 'L'
IF CHOICE = 'M'
IF CHOICE ='Q'
STOP
DISPLAY THE BILLAMOUNT
OF CUSTOMER
DISPLAY LIST OF CUSTOMER
DETAILS
NEW/MODIFY/DELETE
RECORD
QUIT

24. BIBLIOGRAPHY
The great help from our faculty members and my project guide that led the successful
completion of the project. Besides that, I took the help of some books and websites to
develop the project. They are : --
Sumita Arora – Computer Science with C++
E. Balagurusami – C++
Robert Lafore – Turbo C++
website : www.cppforschool.com