Super Market Billing Project In C++

//***************************************************************
//                   HEADER FILE USED IN PROJECT
//****************************************************************

#include<conio.h>
#include<stdio.h>
#include<process.h>
#include<fstream.h>

//***************************************************************
//                   CLASS USED IN PROJECT
//****************************************************************

class product
{
 int pno;
 char name[50];
 float price,qty,tax,dis;
 public:
void create_product()
{
cout<<"\nPlease Enter The Product No. of The Product ";
cin>>pno;
cout<<"\n\nPlease Enter The Name of The Product ";
gets(name);
cout<<"\nPlease Enter The Price of The Product ";
cin>>price;
cout<<"\nPlease Enter The Discount (%) ";
cin>>dis;
}

void show_product()
{
cout<<"\nThe Product No. of The Product : "<<pno;
cout<<"\nThe Name of The Product : ";
puts(name);
cout<<"\nThe Price of The Product : "<<price;
cout<<"\nDiscount : "<<dis;
}

  int  retpno()
  {return pno;}

  float retprice()
  {return price;}

  char* retname()
  {return name;}

  int retdis()
  {return dis;}

};         //class ends here



//***************************************************************
//    global declaration for stream object, object
//****************************************************************

 fstream fp;
 product pr;


//***************************************************************
//    function to write in file
//****************************************************************

void write_product()
   {
    fp.open("Shop.dat",ios::out|ios::app);
    pr.create_product();
    fp.write((char*)&pr,sizeof(product));
    fp.close();
    cout<<"\n\nThe Product Has Been Created ";
    getch();
   }


//***************************************************************
//    function to read all records from file
//****************************************************************


void display_all()
{
    clrscr();
    cout<<"\n\n\n\t\tDISPLAY ALL RECORD !!!\n\n";
    fp.open("Shop.dat",ios::in);
    while(fp.read((char*)&pr,sizeof(product)))
{
pr.show_product();
cout<<"\n\n====================================\n";
getch();
}
    fp.close();
    getch();
}


//***************************************************************
//    function to read specific record from file
//****************************************************************


void display_sp(int n)
{
    int flag=0;
    fp.open("Shop.dat",ios::in);
    while(fp.read((char*)&pr,sizeof(product)))
{
if(pr.retpno()==n)
{
clrscr();
pr.show_product();
flag=1;
}
}
    fp.close();
if(flag==0)
 cout<<"\n\nrecord not exist";
    getch();
}


//***************************************************************
//    function to modify record of file
//****************************************************************


void modify_product()
{
    int no,found=0;
    clrscr();
    cout<<"\n\n\tTo Modify ";
    cout<<"\n\n\tPlease Enter The Product No. of The Product";
    cin>>no;
    fp.open("Shop.dat",ios::in|ios::out);
    while(fp.read((char*)&pr,sizeof(product)) && found==0)
   {
    if(pr.retpno()==no)
   {
    pr.show_product();
    cout<<"\nPlease Enter The New Details of Product"<<endl;
    pr.create_product();
    int pos=-1*sizeof(pr);
    fp.seekp(pos,ios::cur);
    fp.write((char*)&pr,sizeof(product));
    cout<<"\n\n\t Record Updated";
    found=1;
   }
     }
    fp.close();
    if(found==0)
    cout<<"\n\n Record Not Found ";
    getch();
}


//***************************************************************
//    function to delete record of file
//****************************************************************


void delete_product()
   {
    int no;
    clrscr();
    cout<<"\n\n\n\tDelete Record";
    cout<<"\n\nPlease Enter The product no. of The Product You Want To Delete";
    cin>>no;
    fp.open("Shop.dat",ios::in|ios::out);
    fstream fp2;
    fp2.open("Temp.dat",ios::out);
    fp.seekg(0,ios::beg);
    while(fp.read((char*)&pr,sizeof(product)))
{
if(pr.retpno()!=no)
{
fp2.write((char*)&pr,sizeof(product));
}
}
    fp2.close();
    fp.close();
    remove("Shop.dat");
    rename("Temp.dat","Shop.dat");
    cout<<"\n\n\tRecord Deleted ..";
    getch();
    }


//***************************************************************
//    function to display all products price list
//****************************************************************

    void menu()
    {
     clrscr();
     fp.open("Shop.dat",ios::in);
     if(!fp)
     {
       cout<<"ERROR!!! FILE COULD NOT BE OPEN\n\n\n Go To Admin Menu to create File";
       cout<<"\n\n\n Program is closing ....";
       getch();
       exit(0);
     }

     cout<<"\n\n\t\tProduct MENU\n\n";
  cout<<"====================================================\n";
  cout<<"P.NO.\t\tNAME\t\tPRICE\n";
  cout<<"====================================================\n";

      while(fp.read((char*)&pr,sizeof(product)))
{
   cout<<pr.retpno()<<"\t\t"<<pr.retname()<<"\t\t"<<pr.retprice()<<endl;
}
     fp.close();
}




//***************************************************************
//    function to place order and generating bill for Products
//****************************************************************

   void place_order()
   {
    int  order_arr[50],quan[50],c=0;
    float amt,damt,total=0;
    char ch='Y';
    menu();
    cout<<"\n============================";
    cout<<"\n    PLACE YOUR ORDER";
    cout<<"\n============================\n";
    do{
cout<<"\n\nEnter The Product No. Of The Product : ";
cin>>order_arr[c];
cout<<"\nQuantity in number : ";
cin>>quan[c];
c++;
cout<<"\nDo You Want To Order Another Product ? (y/n)";
cin>>ch;
    }while(ch=='y' ||ch=='Y');
    cout<<"\n\nThank You For Placing The Order";getch();clrscr();
      cout<<"\n\n********************************INVOICE************************\n";
      cout<<"\nPr No.\tPr Name\tQuantity \tPrice \tAmount \tAmount after discount\n";
      for(int x=0;x<=c;x++)
{
fp.open("Shop.dat",ios::in);
fp.read((char*)&pr,sizeof(product));
  while(!fp.eof())
{
if(pr.retpno()==order_arr[x])
{
amt=pr.retprice()*quan[x];
damt=amt-(amt*pr.retdis()/100);
cout<<"\n"<<order_arr[x]<<"\t"<<pr.retname()<<"\t"<<quan[x]<<"\t\t"<<pr.retprice()<<"\t"<<amt<<"\t\t"<<damt;
total+=damt;
}
fp.read((char*)&pr,sizeof(product));
}

fp.close();
}
       cout<<"\n\n\t\t\t\t\tTOTAL = "<<total;
    getch();
    }

//***************************************************************
//    INTRODUCTION FUNCTION
//****************************************************************

void intro()
{
 clrscr();
 gotoxy(31,11);
 cout<<"SUPER MARKET";
 gotoxy(35,14);
 cout<<"BILLING";
 gotoxy(35,17);
 cout<<"PROJECT";
 cout<<"\n\nMADE BY : ANUJ KUMAR";
 cout<<"\n\nSCHOOL : RYAN INTERNATIONAL SCHOOL";
 getch();

}




//***************************************************************
//    ADMINSTRATOR MENU FUNCTION
//****************************************************************
void admin_menu()
{
  clrscr();
  char ch2;
  cout<<"\n\n\n\tADMIN MENU";
  cout<<"\n\n\t1.CREATE PRODUCT";
  cout<<"\n\n\t2.DISPLAY ALL PRODUCTS";
  cout<<"\n\n\t3.QUERY ";
  cout<<"\n\n\t4.MODIFY PRODUCT";
  cout<<"\n\n\t5.DELETE PRODUCT";
  cout<<"\n\n\t6.VIEW PRODUCT MENU";
  cout<<"\n\n\t7.BACK TO MAIN MENU";
  cout<<"\n\n\tPlease Enter Your Choice (1-7) ";
  ch2=getche();
  switch(ch2)
  {
    case '1': clrscr();
      write_product();
      break;
    case '2': display_all();break;
    case '3':
       int num;
       clrscr();
       cout<<"\n\n\tPlease Enter The Product No. ";
       cin>>num;
       display_sp(num);
       break;
      case '4': modify_product();break;
      case '5': delete_product();break;
      case '6': menu();
getch();
      case '7': break;
      default:cout<<"\a";admin_menu();
   }
}


//***************************************************************
//    THE MAIN FUNCTION OF PROGRAM
//****************************************************************


void main()
{
  char ch;
  intro();
  do
    {
  clrscr();
  cout<<"\n\n\n\tMAIN MENU";
  cout<<"\n\n\t01. CUSTOMER";
  cout<<"\n\n\t02. ADMINISTRATOR";
  cout<<"\n\n\t03. EXIT";
  cout<<"\n\n\tPlease Select Your Option (1-3) ";
  ch=getche();
  switch(ch)
  {
case '1': clrscr();
   place_order();
   getch();
   break;
  case '2': admin_menu();
    break;
  case '3':exit(0);
  default :cout<<"\a";
}
    }while(ch!='3');
}

//***************************************************************
//    END OF PROJECT
//***************************************************************