C++ Project on Telephone Billing System

Telephone Billing System

Aim: To create a Telephone Billing System in C++ that manages consumer records including call charges, rent, taxes, and net payable amounts.

#include "graphics.h"
#include
#include
#include
#include
#include
#include
#include
#include
#include

void proj_name(void);
void created(void);

class consumer
{
  public:
    long unsigned int tel_no;
    long unsigned int con_no;
    char name[60];
    char add[300];
    char city[40];
    long unsigned int op_rdg;
    long unsigned int cl_rdg;
    long unsigned int met_calls;
    long unsigned int free_calls;
    long unsigned int charge_calls;
    float met_charge;
    float rent;
    float debits;
    float tax;
    float credits;
    float gross_amt;
    float surcharge;
    long unsigned int net_amt_bef;
    long unsigned int net_amt_aft;
  public:
    void get_data(void);
    void show_data(void);
};

void consumer::get_data(void)
{
  setfillstyle(1,BLACK);
  bar(0,0,680,480);
  consumer g1; int a; char ch;
  setlinestyle(0,0,3);
  setcolor(BROWN);
  settextstyle(1,0,5);
  outtextxy(90,20,"ENTER THE RECORD:-");
  setfillstyle(1,BLACK);
  bar(50,100,550,400);
  rectangle(50,100,550,400);
  gotoxy(10,10);
  cout<<"TELEPHONE NO.    :";
  cout>>op_rdg;
  gotoxy(10,20);
  cout<<"CLOSING READING  :";
  cin>>cl_rdg;
  met_calls=cl_rdg-op_rdg;
  free_calls=150;
  rent=360;
  if(met_calls>debits;
  tax=(rent+met_charge+debits)/20;
  gross_amt=(met_charge+rent+tax+debits);
  gotoxy(10,24);
  cout<<"CREDITS          :";
  cin>>credits;
  if(credits>gross_amt)
    net_amt_bef=0;
  else
    net_amt_bef=gross_amt-credits;
  if(credits>=gross_amt)
    surcharge=0;
  else
    surcharge=20;
  net_amt_aft=net_amt_bef+surcharge;
}

void consumer::show_data(void)
{
  bar(0,0,660,480);
  setcolor(RED);
  settextstyle(8,0,3);
  outtextxy(55,10,"BHARAT SANCHAR NIGAM LIMITED");
  setlinestyle(1,0,3);
  line(51,40,486,40);
  gotoxy(10,5);
  settextstyle(3,0,1);
  setcolor(BROWN);
  outtextxy(15,55,"TELEPHONE NO.");
  outtextxy(330,55,"CONSUMER NO.");
  outtextxy(15,170,"OPENING READING  ");
  outtextxy(15,205,"CLOSING READING  ");
  outtextxy(15,235,"METERED CALLS    ");
  outtextxy(15,268,"FREE CALLS       ");
  outtextxy(15,300,"CHARGABLE CALLS  ");
  setcolor(BROWN);
  outtextxy(330,170,"METERED CALLS   ");
  outtextxy(330,205,"DEBITS          ");
  outtextxy(330,235,"TAXES           ");
  outtextxy(330,268,"GROSS AMOUNT    ");
  outtextxy(330,300,"CREDITS         ");
  outtextxy(330,140,"RENTAL                             ");
  setcolor(MAGENTA);
  outtextxy(15,327,"AMOUNT PAYABLE IF PAID ON OR BEFORE ");
  setcolor(BROWN);
  outtextxy(15,350,"SURCHARGE                           ");
  setcolor(MAGENTA);
  outtextxy(15,377,"AMOUNT PAYABLE IF PAID ON OR AFTER  ");
  setcolor(RED);
  setlinestyle(0,0,3);
  bar(70,90,320,160);
  rectangle(70,90,320,160);
  gotoxy(20,5);
  cout>>a;
  setfillstyle(1,0);

  // TO ADD NEW RECORD
  if(a==1)
  {
    do
    {
      setfillstyle(1,LIGHTMAGENTA);
      bar(0,0,679,679);
      settextstyle(1,0,4);
      setcolor(BLUE);
      outtextxy(90,10,"ENTER THE RECORD:-");
      gotoxy(40,9);
      long unsigned int tel_no;
      outtextxy(50,110,"TELEPHONE_NO :");
      cin>>tel_no;
      fin.seekg(0);
      do
      {
        fin.read((char*)&g1,sizeof(g1));
        if(fin.eof())
          break;
        if(g1.tel_no==tel_no)
        {
          bar(0,0,679,679);
          settextstyle(1,0,3);
          setfillstyle(1,LIGHTCYAN);
          bar(20,200,610,250);
          outtextxy(20,220,"PERSON WITH THIS TELEPHONE_NO ALREADY EXISTS");
          delay(2000);
          goto u;
        }
      }while(!fin.eof());
      fin.close();
      fin.open("m.dat",ios::app|ios::out|ios::in|ios::ate|ios::binary);
      fin.seekg(0,ios::end);
      long unsigned int r=fin.tellg();
      long unsigned int t=(r/sizeof(g1))+1;
      con_no=t;
      g1.tel_no=tel_no;
      g1.con_no=con_no;
      g1.get_data();
      fin.write((char*)&g1,sizeof(g1));
      setcolor(RED);
      settextstyle(8,0,4);
      outtextxy(12,420,"ENTER ANY OTHER RECORD(Y/N)");
      setfillstyle(1,4);
      bar(250,450,270,470);
      gotoxy(37,35);
      answer=getche();
    }
    while((answer=='Y')||(answer=='y'));
    goto u;
  }

  // TO SEE THE RECORDS
  else if(a==2)
  {
    fin.seekg(0);
    fin.read((char*)&g1,sizeof(g1));
    do
    {
      clrscr();
      g1.show_data();
      fin.read((char*)&g1,sizeof(g1));
      getch();
    }
    while(!fin.eof());
    fin.close();
    goto i;
  }

  // FOR ENQUIRY
  else if(a==3)
  {
    long unsigned int tel_no1;
    bar(0,0,679,679);
    setcolor(GREEN);
    outtextxy(70,150,"ENTER THE TELEPHONE_NO OF PERSON :");
    gotoxy(35,15);
    cin>>tel_no1;
    bar(0,0,679,679);
    fin.seekg(0);
    do
    {
      fin.read((char*)&g1,sizeof(g1));
      if(fin.eof())
        goto y;
      else if(g1.tel_no==tel_no1)
        break;
    }
    while(fin);
    g1.show_data();
    getch();
    goto u;
  }

  // FOR MODIFICATION
  else if(a==4)
  {
    long unsigned int tel_no2;
    long unsigned int con_no;
    char name[60];
    char add[300];
    char city[40];
    long unsigned int op_rdg;
    long unsigned int cl_rdg;
    long unsigned int met_calls;
    long unsigned int free_calls;
    long unsigned int charge_calls;
    float met_charge;
    float rent;
    float debits;
    float tax;
    float credits;
    float gross_amt;
    float surcharge;
    long unsigned int net_amt_bef;
    long unsigned int net_amt_aft;
    bar(0,0,679,679);
    setcolor(MAGENTA);
    outtextxy(100,150,"ENTER THE TELEPHONE_NO OF PERSON ");
    outtextxy(100,180,"        TO BE MODIFIED           ");
    gotoxy(35,17);
    cin>>tel_no2;
    setfillstyle(1,0);
    fin.seekg(0);
    do
    {
      fin.read((char*)&g1,sizeof(g1));
      if(fin.eof())
      {
        setfillstyle(1,LIGHTMAGENTA);
        bar(0,0,679,679);
        setfillstyle(1,LIGHTCYAN);
        bar(40,200,565,250);
        setcolor(BLUE);
        settextstyle(1,0,3);
        outtextxy(70,220,"DESIRED TELEPHONE_NO DOES NOT EXISTS");
        delay(2000);
        setfillstyle(1,0);
        goto u;
      }
      if(g1.tel_no==tel_no2)
      {
        char ch;
        long unsigned int b=fin.tellg();
        long unsigned int s=sizeof(g1);
        fin.close();
        fin.open("m.dat",ios::out|ios::ate|ios::binary);
        fin.seekp(b-s);
        setfillstyle(1,BLACK);
        bar(0,0,680,480);
        setlinestyle(0,0,3);
        setcolor(BROWN);
        settextstyle(1,0,5);
        outtextxy(90,20,"ENTER THE RECORD:-");
        setfillstyle(1,BLACK);
        bar(50,100,550,400);
        rectangle(50,100,550,400);
        gotoxy(10,10);
        cout<<"TELEPHONE NO.    :";
        cout>>op_rdg;
        gotoxy(10,20);
        cout<<"CLOSING READING  :";
        cin>>cl_rdg;
        met_calls=cl_rdg-op_rdg;
        free_calls=150;
        rent=360;
        if(met_calls>debits;
        tax=(rent+met_charge+debits)/20;
        gross_amt=(met_charge+rent+tax+debits);
        gotoxy(10,24);
        cout<<"CREDITS          :";
        cin>>credits;
        if(credits>gross_amt)
          net_amt_bef=0;
        else
          net_amt_bef=gross_amt-credits;
        if(credits>=gross_amt)
          surcharge=0;
        else
          surcharge=20;
        net_amt_aft=net_amt_bef+surcharge;
        g1.con_no=g1.con_no;
        strcpy(g1.name,name);
        strcpy(g1.add,add);
        strcpy(g1.city,city);
        g1.op_rdg=op_rdg;
        g1.cl_rdg=cl_rdg;
        g1.met_calls=met_calls;
        g1.free_calls=free_calls;
        g1.charge_calls=charge_calls;
        g1.met_charge=met_charge;
        g1.rent=rent;
        g1.debits=debits;
        g1.tax=tax;
        g1.credits=credits;
        g1.gross_amt=gross_amt;
        g1.surcharge=surcharge;
        g1.net_amt_bef=net_amt_bef;
        g1.net_amt_aft=net_amt_aft;
        fin.write((char*)&g1,sizeof(g1));
        goto kk;
      }
    }while(fin);

kk:
    setfillstyle(1,LIGHTMAGENTA);
    bar(0,0,679,679);
    setfillstyle(1,LIGHTCYAN);
    bar(35,200,550,250);
    setcolor(BLUE);
    settextstyle(1,0,3);
    outtextxy(80,220,"RECORD OF THIS PERSON IS MODIFIED");
    delay(4000);
    setfillstyle(1,0);
    goto u;
  }

  // FOR EXIT
  else
  {
    exit(0);
  }

u:
  fin.close();
  bar(0,0,680,480);
  goto i;

y:
  setfillstyle(1,LIGHTMAGENTA);
  bar(0,0,679,679);
  settextstyle(TRIPLEX_FONT,0,3);
  setfillstyle(1,LIGHTCYAN);
  bar(150,200,490,245);
  setcolor(BLUE);
  outtextxy(210,220,"RECORD NOT FOUND");
  setfillstyle(1,0);
  fin.close();
  delay(2000);
  goto u;
}

void proj_name(void)
{
  fflush(stdin);
  int midx,midy;
  midx=getmaxx()/2;
  midy=getmaxy()/2;
  int i,j;
  setcolor(RED);
  setlinestyle(1,0,3);
  setfillstyle(1,CYAN);
  bar(2,1,660,660);
  rectangle(2,1,660,660);
  setcolor(RED);
  setfillstyle(1,WHITE);
  bar(25,75,575,425);
  rectangle(25,75,575,425);
  setfillstyle(1,CYAN);
  bar(50,100,550,400);
  rectangle(50,100,550,400);
  setcolor(RED);
  setfillstyle(1,WHITE);
  bar(75,125,525,375);
  rectangle(75,125,525,375);
  setcolor(RED);
  setfillstyle(1,CYAN);
  bar(100,150,500,350);
  rectangle(100,150,500,350);
  setcolor(RED);
  settextstyle(0,0,1);
  settextstyle(1,0,6);
  settextjustify(CENTER_TEXT,CENTER_TEXT);
  for(i=170;i<=172;i++)
  {
    sleep(1);
    outtextxy(291,i,    "TELEPHONE");
    outtextxy(301,i+70, " BILLING ");
    outtextxy(331,i+140,"SYSTEM  ");
  }
}

void created(void)
{
  fflush(stdin);
  setfillstyle(1,LIGHTCYAN);
  rectangle(2,1,660,660);
  bar(2,1,660,660);
  setcolor(RED);
  setlinestyle(1,0,3);
  settextstyle(1,0,8);
  settextjustify(LEFT_TEXT,TOP_TEXT);
  line(10,110,380,110);
  outtextxy(10,20,"C");
  settextstyle(4,0,8);
  outtextxy(47,20,"reated By:-");
  settextstyle(1,0,6);
  settextjustify(LEFT_TEXT,CENTER_TEXT);
  outtextxy(275,250,"MOHIT & ROHIT");
  sleep(1);
  sleep(1);
  clrscr();
}