Telecom Billing Management System

This Mini project is compile in gcc compiler with code::blocks IDE. This project can be a good reference for those student who are doing there school project in c.Architecture of this project is very simple and easy to understand the code. Just file handling is used to store the data and corresponding function are made to manipulate the data.

The tasks provide in this program are:-
1. A : for adding new records.
2. L : for list of records.
3. M : for modifying records.
4. P : for payment.
5. S : for searching records.
6. D : for deleting records.
User are provide the above tasks.They can add records,modify and view records. Searching and deleting facilities is also provided.

Here is the complete source code , copy and compile it in code::blocks.You can also download the project form below

#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);
               getch();
               fwrite(&s,sizeof(s),1,f);
               break;
          }
     }
     system("cls");
     printf("THANK YOU %s FOR YOUR TIMELY PAYMENTS",s.name);
     fclose(f);
}