Mini project supermarket billing system in c++ source code download

This mini project is written in C++ where you find mainly two classes one class item another class amount and class amount is inheritance form class item.It is simple console application without graphics. From this project you learn file handling in c++ and use of stream class.And main defect of this program is that goto label  is used to jump form one menu to another menu and separate function for editing  and deleting items are not used.So,if you want to make it your school project or college mini project then modify it ,make separate function for editing and deleting and also try to use while loop instead of goto label .Any suggestion and help for this project is appreciated .
Here is the source code ,copy and compile it in gcc with code::blocks IDE or Download project from GitHub.

//program for creating bill in a supermarket

#include<iostream>

#include<windows.h>

#include<conio.h>

#include<fstream>

#include<cstring>

#include<cstdio>

#include<cstdlib>

#include<iomanip>

using namespace std;

//global variable declaration

int k=7,r=0,flag=0;

COORD coord = {0, 0};

void gotoxy(int x, int y)

{

 COORD coord;

 coord.X = x;

 coord.Y = y;

 SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), coord);

}

struct date

{int mm,dd,yy;};

ofstream fout;

ifstream fin;

class item

{

int itemno;

char name[25];

date d;

public:

void add()

{

cout<<"\n\n\tItem No: ";

cin>>itemno;

cout<<"\n\n\tName of the item: ";

cin>>name;

//gets(name);

cout<<"\n\n\tManufacturing Date(dd-mm-yy): ";

cin>>d.mm>>d.dd>>d.yy;

}

void show()

{

cout<<"\n\tItem No: ";

cout<<itemno;

cout<<"\n\n\tName of the item: ";

cout<<name;

cout<<"\n\n\tDate : ";

cout<<d.mm<<"-"<<d.dd<<"-"<<d.yy;

}

void report()

{

gotoxy(3,k);

cout<<itemno;

gotoxy(13,k);

puts(name);

}

int retno()

{

    return(itemno);

}

};

class amount: public item

{

float price,qty,tax,gross,dis,netamt;

public:

void add();

void show();

void report();

void calculate();

void pay();

float retnetamt()

{

    return(netamt);

}

}amt;

void amount::add()

{

item::add();

cout<<"\n\n\tPrice: ";

cin>>price;

cout<<"\n\n\tQuantity: ";

cin>>qty;

cout<<"\n\n\tTax percent: ";

cin>>tax;

cout<<"\n\n\tDiscount percent: ";

cin>>dis;

calculate();

fout.write((char *)&amt,sizeof(amt));

fout.close();

}

void amount::calculate()

{gross=price+(price*(tax/100));

netamt=qty*(gross-(gross*(dis/100)));

}

void amount::show()

{fin.open("itemstore.dat",ios::binary);

fin.read((char*)&amt,sizeof(amt));

item::show();

cout<<"\n\n\tNet amount: ";

cout<<netamt;

fin.close();

}

void amount::report()

{item::report();

gotoxy(23,k);

cout<<price;

gotoxy(33,k);

cout<<qty;

gotoxy(44,k);

cout<<tax;

gotoxy(52,k);

cout<<dis;

gotoxy(64,k);

cout<<netamt;

k=k+1;

if(k==50)

{gotoxy(25,50);

cout<<"PRESS ANY KEY TO CONTINUE...";

getch();

k=7;

system("cls");

gotoxy(30,3);

cout<<" ITEM DETAILS ";

gotoxy(3,5);

cout<<"NUMBER";

gotoxy(13,5);

cout<<"NAME";

gotoxy(23,5);

cout<<"PRICE";

gotoxy(33,5);

cout<<"QUANTITY";

gotoxy(44,5);

cout<<"TAX";

gotoxy(52,5);

cout<<"DEDUCTION";

gotoxy(64,5);

cout<<"NET AMOUNT";

}

}

void amount::pay()

{show();

cout<<"\n\n\n\t\t*********************************************";

cout<<"\n\t\t                 DETAILS                  ";

cout<<"\n\t\t*********************************************";

cout<<"\n\n\t\tPRICE                     :"<<price;

cout<<"\n\n\t\tQUANTITY                  :"<<qty;

cout<<"\n\t\tTAX PERCENTAGE              :"<<tax;

cout<<"\n\t\tDISCOUNT PERCENTAGE         :"<<dis;

cout<<"\n\n\n\t\tNET AMOUNT              :Rs."<<netamt;

cout<<"\n\t\t*********************************************";

}

int main()

{

cout.setf(ios::fixed);

cout.setf(ios::showpoint);

cout<<setprecision(2);

fstream tmp("temp.dat",ios::binary|ios::out);

menu:

system("cls");

gotoxy(25,2);

cout<<"Super Market Billing ";

gotoxy(25,3);

cout<<"===========================\n\n";

cout<<"\n\t\t1.Bill Report\n\n";

cout<<"\t\t2.Add/Remove/Edit Item\n\n";

cout<<"\t\t3.Show Item Details\n\n";

cout<<"\t\t4.Exit\n\n";

cout<<"\t\tPlease Enter Required Option: ";

int ch,ff;

float gtotal;

cin>>ch;

switch(ch)

{case 1:ss:

system("cls");

gotoxy(25,2);

cout<<"Bill Details";

gotoxy(25,3);

cout<<"================\n\n";

cout<<"\n\t\t1.All Items\n\n";

cout<<"\t\t2.Back to Main menu\n\n";

cout<<"\t\tPlease Enter Required Option: ";

int cho;

cin>>cho;

if(cho==1)

{system("cls");

gotoxy(30,3);

cout<<" BILL DETAILS ";

gotoxy(3,5);

cout<<"ITEM NO";

gotoxy(13,5);

cout<<"NAME";

gotoxy(23,5);

cout<<"PRICE";

gotoxy(33,5);

cout<<"QUANTITY";

gotoxy(44,5);

cout<<"TAX %";

gotoxy(52,5);

cout<<"DISCOUNT %";

gotoxy(64,5);

cout<<"NET AMOUNT";

fin.open("itemstore.dat",ios::binary);

if(!fin)

{cout<<"\n\nFile Not Found...";

goto menu;}

fin.seekg(0);

gtotal=0;

while(!fin.eof())

{fin.read((char*)&amt,sizeof(amt));

if(!fin.eof())

{amt.report();

gtotal+=amt.retnetamt();

ff=0;}

if(ff!=0) gtotal=0;

}gotoxy(17,k);

cout<<"\n\n\n\t\t\tGrand Total="<<gtotal;

getch();

fin.close();

}

if(cho==2)

{goto menu;}

goto ss;

case 2:

db:

system("cls");

gotoxy(25,2);

cout<<"Bill Editor";

gotoxy(25,3);

cout<<"=================\n\n";

cout<<"\n\t\t1.Add Item Details\n\n";

cout<<"\t\t2.Edit Item Details\n\n";

cout<<"\t\t3.Delete Item Details\n\n";

cout<<"\t\t4.Back to Main Menu ";

int apc;

cin>>apc;

switch(apc)

{

case 1:fout.open("itemstore.dat",ios::binary|ios::app);

amt.add();

cout<<"\n\t\tItem Added Successfully!";

getch();

goto db;

case 2:

int ino;

flag=0;

cout<<"\n\n\tEnter Item Number to be Edited :";

cin>>ino;

fin.open("itemstore.dat",ios::binary);

fout.open("itemstore.dat",ios::binary|ios::app);

if(!fin)

{cout<<"\n\nFile Not Found...";

goto menu;

}

fin.seekg(0);

r=0;

while(!fin.eof())

{fin.read((char*)&amt,sizeof(amt));

if(!fin.eof())

{int x=amt.item::retno();

if(x==ino)

{flag=1;

fout.seekp(r*sizeof(amt));

system("cls");

cout<<"\n\t\tCurrent Details are\n";

amt.show();

cout<<"\n\n\t\tEnter New Details\n";

amt.add();

cout<<"\n\t\tItem Details editted";

}

}r++;

}

if(flag==0)

{cout<<"\n\t\tItem No does not exist...Please Retry!";

getch();

goto db;

}

fin.close();

getch();

goto db;

case 3:flag=0;

cout<<"\n\n\tEnter Item Number to be deleted :";

cin>>ino;

fin.open("itemstore.dat",ios::binary);

if(!fin)

{cout<<"\n\nFile Not Found...";

goto menu;

}

//fstream tmp("temp.dat",ios::binary|ios::out);

fin.seekg(0);

while(fin.read((char*)&amt, sizeof(amt)))

{int x=amt.item::retno();

if(x!=ino)

tmp.write((char*)&amt,sizeof(amt));

else

{flag=1;}

}

fin.close();

tmp.close();

fout.open("itemstore.dat",ios::trunc|ios::binary);

fout.seekp(0);

tmp.open("temp.dat",ios::binary|ios::in);

if(!tmp)

{cout<<"Error in File";

goto db;

}

while(tmp.read((char*)&amt,sizeof(amt)))

fout.write((char*)&amt,sizeof(amt));

tmp.close();

fout.close();

if(flag==1)

cout<<"\n\t\tItem Succesfully Deleted";

else if (flag==0)

cout<<"\n\t\tItem does not Exist! Please Retry";

getch();

goto db;

case 4:

goto menu;

default: cout<<"\n\n\t\tWrong Choice!!! Retry";

getch();

goto db;

}

case 3:system("cls");

flag=0;

int ino;

cout<<"\n\n\t\tEnter Item Number :";

cin>>ino;

fin.open("itemstore.dat",ios::binary);

if(!fin)

{cout<<"\n\nFile Not Found...\nProgram Terminated!";

goto menu;

}

fin.seekg(0);

while(fin.read((char*)&amt,sizeof(amt)))

{int x=amt.item::retno();

if(x==ino)

{amt.pay();

flag=1;

break;

}

}

if(flag==0)

cout<<"\n\t\tItem does not exist....Please Retry!";

getch();

fin.close();

goto menu;

case 4:system("cls");

gotoxy(20,20);

cout<<"ARE YOU SURE, YOU WANT TO EXIT (Y/N)?";

char yn;

cin>>yn;

if((yn=='Y')||(yn=='y'))

{gotoxy(12,20);

system("cls");

cout<<"************************** THANKS **************************************";

getch();

exit(0);

}

else if((yn=='N')||(yn=='n'))

goto menu;

else{goto menu;}

default:cout<<"\n\n\t\tWrong Choice....Please Retry!";

getch();

goto menu;

}

return 0;

}