Mini Project in C Telecom Billing System

Features of Telecom Billing System in C:

Simple functions have been used in co-ordination with data structure and file handling. As the project is relatively short, you can thoroughly go through the whole source code; this will help you understand data structure and file handling if you know their fundamentals. You’ll also get the basic idea regarding “how to develop a C mini project” in a very simple manner.

The functions and features used in this project are listed below:

• Add new records: add new data into file with name, phone number and amount to be paid
• View list of records – lists all telephone billing records (as shown in screenshot 3)
• Modify records – edit the added records; name, phone number and/or amount of payment can be edited
• View payment – shows amount to be paid
• Search records – search for added/updated records in file
• Delete records – removes data permanently from file

This project is limited to the functions aforementioned. You can add new features as you like to make this project a better one.

CODE:

#include<stdio.h>

#include<conio.h>

#include<ctype.h>

#include<windows.h>

#include<stdlib.h>

struct subscriber

{

char phonenumber[20];

char name[50];

float amount;

}s;

void addrecords();

void listrecords();

void modifyrecords();

void deleterecords();

void searchrecords();

void payment();

char get;

int main()

{ int password;

int phonenumber;

char choice;

system("cls");

printf("\n\n\n\n\n\n\n\n\n**************************************************************");

printf("\n\t\t------WELCOME TO THE TELECOM BILLING MANAGEMENT SYSTEM---");

printf("\n\t\t****************************************************************");

Sleep(2000);

getch();

    system("cls");

while (1)

{

system("cls");

printf("\n Enter\n A : for adding new records.\n L : for list of records");

printf("\n M : for modifying records.\n P : for payment");

printf("\n S : for searching records.");

printf("\n D : for deleting records.\n E : for exit\n");

choice=getche();

choice=toupper(choice);

switch(choice)

{

case 'P':

payment();break;

case 'A':

addrecords();break;

case 'L':

listrecords();break;

case 'M':

modifyrecords();break;

case 'S':

searchrecords();break;

case 'D':

deleterecords();break;

case 'E':

system("cls");

printf("\n\n\t\t\t\tTHANK YOU");

printf("\n\n\n\n\n:\n\tFOR USING OUR SERVICE");

Sleep(2000);

exit(0);

break;

default:

system("cls");

printf("Incorrect Input");

printf("\nAny key to continue");

getch();

}

}

}

void addrecords()

{

FILE *f;

char test;

f=fopen("c:/file.ojs","ab+");

if(f==0)

{   f=fopen("c:/file.ojs","wb+");

system("cls");

printf("please wait while we configure your computer");

printf("/npress any key to continue");

getch();

}

while(1)

{

system("cls");

printf("\n Enter phone number:");

scanf("%s",&s.phonenumber);

printf("\n Enter name:");

fflush(stdin);

scanf("%[^\n]",&s.name);

printf("\n Enter amount:");

scanf("%f",&s.amount);

fwrite(&s,sizeof(s),1,f);

fflush(stdin);

system("cls");

printf("1 record successfully added");

printf("\n Press esc key to exit, any other key to add other record:");

test=getche();

if(test==27)

break;

}

fclose(f);

}

void listrecords()

{

FILE *f;

int i;

if((f=fopen("c:/file.ojs","rb"))==NULL)

exit(0);

system("cls");

printf("Phone Number\t\tUser Name\t\t\tAmount\n");

for(i=0;i<79;i++)

printf("-");

while(fread(&s,sizeof(s),1,f)==1)

{

printf("\n%-10s\t\t%-20s\t\tRs. %.2f /-",s.phonenumber,s.name,s.amount);

}

printf("\n");

for(i=0;i<79;i++)

printf("-");

fclose(f);

getch();

}

void deleterecords()

{

FILE *f,*t;

int i=1;

char phonenumber[20];

if((t=fopen("c:/temp.ojs","w+"))==NULL)

exit(0);

if((f=fopen("c:/file.ojs","rb"))==NULL)

exit(0);

system("cls");

printf("Enter the phone number to be deleted from the Database");

fflush(stdin);

scanf("%[^\n]",phonenumber);

while(fread(&s,sizeof(s),1,f)==1)

{

if(strcmp(s.phonenumber,phonenumber)==0)

{       i=0;

continue;

}

else

fwrite(&s,sizeof(s),1,t);

}

if(i==1)

{       system("cls");

printf("Phone number \"%s\" not found",phonenumber);

remove("c:/file.ojs");

rename("c:/temp.ojs","c:/file.ojs");

getch();

fclose(f);

fclose(t);

main();

}

remove("c:/file.ojs");

rename("c:/temp.ojs","c:/file.ojs");

system("cls");

printf("The Number %s Successfully Deleted!!!!",phonenumber);

fclose(f);

fclose(t);

getch();

}

void searchrecords()

{

FILE *f;

char phonenumber[20];

int flag=1;

f=fopen("c:/file.ojs","rb+");

if(f==0)

exit(0);

fflush(stdin);

system("cls");

printf("Enter Phone Number to search in our database");

scanf("%s", phonenumber);

while(fread(&s,sizeof(s),1,f)==1)

{

if(strcmp(s.phonenumber,phonenumber)==0)

{ system("cls");

printf(" Record Found ");

printf("\n\nPhonenumber: %s\nName: %s\nAmount: Rs.%0.2f\n",s.phonenumber,s.name,s.amount);

flag=0;

break;

}

else if(flag==1)

{ system("cls");

printf("Requested Phone Number Not found in our database");

}

}

getch();

fclose(f);

}

void modifyrecords()

{

FILE *f;

char phonenumber[20];

long int size=sizeof(s);

if((f=fopen("c:/file.ojs","rb+"))==NULL)

exit(0);

system("cls");

printf("Enter phone number of the subscriber to modify:");

scanf("%[^\n]",phonenumber);

fflush(stdin);

while(fread(&s,sizeof(s),1,f)==1)

{

if(strcmp(s.phonenumber,phonenumber)==0)

{

system("cls");

printf("\n Enter phone number:");

scanf("%s",&s.phonenumber);

printf("\n Enter name: ");

fflush(stdin);

scanf("%[^\n]",&s.name);

printf("\n Enter amount: ");

scanf("%f",&s.amount);

fseek(f,-size,SEEK_CUR);

fwrite(&s,sizeof(s),1,f);

break;

}

}

fclose(f);

}

void payment()

{

FILE *f;

char phonenumber[20];

long int size=sizeof(s);

float amt;

int i;

if((f=fopen("c:/file.ojs","rb+"))==NULL)

exit(0);

system("cls");

printf("Enter phone number of the subscriber for payment");

scanf("%[^\n]",phonenumber);

fflush(stdin);

while(fread(&s,sizeof(s),1,f)==1)

{

if(strcmp(s.phonenumber,phonenumber)==0)

{

system("cls");

printf("\n Phone No.: %s",s.phonenumber);

printf("\n Name: %s",s.name);

printf("\n Current amount: %f",s.amount);

printf("\n");

for(i=0;i<79;i++)

printf("-");

printf("\n\nEnter amount of payment :");

fflush(stdin);

scanf(" %f",&amt);

s.amount=s.amount-amt;

fseek(f,-size,SEEK_CUR);

fwrite(&s,sizeof(s),1,f);

break;

}

}

system("cls");

printf("THANK YOU %s FOR YOUR TIMELY PAYMENTS",s.name);

getch();

fclose(f);

}