C++ project on sales management

/* ****************************
*  SALES MANAGEMENT SYSTEM *
****************************
*/
#include<fstream .h>
#include<stdio .h>
#include<conio .h>
#include<string .h>
#include<dos .h>
#include<iomanip .h>
#include<ctype .h>
#include<stdlib .h>

struct date_rec // record to get date
{
short int day;
short int month;
int year;
}current_date;

struct node // structure to make an index of the record nos.
{
int rec_no;
node *link;
};
node *start,*ptr;

// DECLAIRING CLASS HERE
//      this class defines data related to items

class item_list
{
private:
int item_code,qty_in_stock; //item code and quantity in stock
char item_name[30];
float item_rate;
public:
item_list() //no argument constructor
{
item_code=0;
memset(item_name,0,30);
item_rate=0.0;
qty_in_stock=0;
}
void get_item(); //this function reads the private member of item file
int vallidate(int item_code,int qty);
//this function verifies item code correponding qty in stock
float update_on_sale(int ic1,int ic2,int ic3,int ic4,int ic5,
    int iq1,int iq2,int iq3,int iq4,int iq5);
//this function updates the qty whenever item is purchased

void update_on_purchase(item_list temp_item);
void purchase_order();
//to generate purchase order list if stock is less than 20

node* create_list();   //create an index of objects
void items_available(); //display the item available
}item;           //object list

//      this class defines the data and member function related to
// sales of an item.

class sales_list
{
private:
int cash_memo_num;
date_rec cash_memo_date;
int item_code1,i_qty1;
int item_code2,i_qty2;
int item_code3,i_qty3;
int item_code4,i_qty4;
int item_code5,i_qty5;
float total_amount;

public:
char ch;
sales_list() // constructor
{
item_code1=i_qty1=0;
item_code2=i_qty2=0;
item_code3=i_qty3=0;
item_code4=i_qty4=0;
item_code5=i_qty5=0;
total_amount=0.0;
}

//  this function checks for availability of an item and its quantity
int vallidate_item(int item_code,int qty);

//  this function generates record number automatically
int get_memo_no(struct date_rec current_date);
//  this function collects information to prepare cash memo
void get_chmo_info();
void show_data(); //  this function displays data

//   this function adds a record to the master file
void update_sales_file(int memo_num,int ic1,int ic2,int ic3,int ic4,int ic5,
      int iq1,int iq2,int iq3,int iq4,int iq5,float amount);
void daily_sales_report(struct date_rec current_date);
}cash_memo; //  object list

//  DECLARING MEMBER FUNCTIONS HERE

//  this member function reads the private members of class itemfile
void item_list::get_item()
{
gotoxy(20,5);
cout<<"ENTER THE ITEM CODE ------------>";
cin>>item_code;
gotoxy(20,6);
cout<<"ENTER THE ITEM NAME ------------>";
gets(item_name);
gotoxy(20,7);
cout<<"ENTER THE ITEM RATE ------------>";
cin>>item_rate;
gotoxy(20,8);
cout<<"ENTER THE QUANTITY ------------->";
cin>>qty_in_stock;
}

//  this member function enters a new item in itemfile, calls get_item();

void item_list::update_on_purchase(item_list temp_item)
{
fstream item_file;
//item.get_item();
item_file.open("itemfile.dat",ios::app | ios::in | ios::out);
// open file in append mode
int found=0;
item_file.seekg(0);
item_file.read((char*)&item,sizeof(item));
int n=item_file.tellg();
while(!item_file.eof())
   {
     if(item.item_code==temp_item.item_code)
{
  item.item_rate=temp_item.item_rate;
  item.qty_in_stock=item.qty_in_stock+temp_item.qty_in_stock;
  item_file.seekg(n-sizeof(item));
  item_file.write((char*)&item,sizeof(item));
  found=1;
}
     item_file.read((char*)&item,sizeof(item)); // write in the file
     n=item_file.tellg();
   }
item_file.close();
if(found==0)
   {
   item_file.open("itemfile.dat",ios::app,ios::out);
   item_file.seekg(0,ios::end);
   item_file.write((char*)&temp_item,sizeof(temp_item));
   item_file.close();
   }
}

//  this member function checks for the availability of item and quantity

int item_list::vallidate(int i_code,int i_qty)
{
  item_list temp_item;
  fstream item_file;
  int ret=0;
  item_file.open("itemfile.dat",ios::in);
  item_file.seekg(0);
  item_file.read((char*)&temp_item,sizeof(temp_item));
while(!item_file.eof())
  {
    if(temp_item.item_code==i_code&&temp_item.qty_in_stock>=i_qty)
ret=1;
    item_file.read((char*)&temp_item,sizeof(temp_item));
  }
item_file.close();
return ret;
}

float item_list::update_on_sale(int ic1,int ic2,int ic3,int ic4,int ic5,
int iq1,int iq2,int iq3,int iq4,int iq5)
{
fstream item_file;
float amount=0;
item_file.open("itemfile.dat",ios::in);
item_file.seekg(0);//set file pointer to the begining of the file
item_file.read((char*)&item,sizeof(item));
int n=item_file.tellg();
while(!item_file.eof())
  {
    if(item.item_code==ic1)
    {
      if(item.vallidate(ic1,iq1))
      {
       gotoxy(59,9);
       cout<<setiosflags(ios::fixed)   //fixed
       <<setiosflags(ios::showpoint)   //always show point
       <<setprecision(2)           //two decimal places
       <<item.item_rate;
       item.qty_in_stock=item.qty_in_stock-iq1;
       if(item.qty_in_stock<=0)
 item.qty_in_stock=0;
       amount=amount+(item.item_rate*iq1);
       item_file.seekg(n-sizeof(item));
       item_file.write((char*)&item,sizeof(item));
       }
     else
     {
       gotoxy(59,9);
       cout<<"NOT AVAILABLE";
       }
      }
    if(item.item_code==ic2)
    {
      if(item.vallidate(ic2,iq2))
{
gotoxy(59,10);
cout<<setiosflags(ios::fixed)
<<setiosflags(ios::showpoint)<<setprecision(2)<<item.item_rate;
item.qty_in_stock=item.qty_in_stock-iq2;
if(item.qty_in_stock<=0)
item.qty_in_stock=0;
amount=amount+(item.item_rate*iq2);
item_file.seekg(n-sizeof(item));
item_file.write((char*)&item,sizeof(item));
    }
    else
    {
    gotoxy(59,10);
    cout<<"NOT AVAILABLE";
    }
  }
      if(item.item_code==ic3)
    {
      if(item.vallidate(ic3,iq3))
{
gotoxy(59,11);
cout<<setiosflags(ios::fixed)
<<setiosflags(ios::showpoint)<<setprecision(2)<<item.item_rate;
item.qty_in_stock=item.qty_in_stock-iq3;
if(item.qty_in_stock<=0)
item.qty_in_stock=0;
amount=amount+(item.item_rate*iq3);
item_file.seekg(n-sizeof(item));
item_file.write((char*)&item,sizeof(item));
    }
else
  {
   gotoxy(59,11);
   cout<<"NOT AVAILABLE";
   }
 }
 if(item.item_code==ic4)
 {
   if(item.vallidate(ic4,iq4))
  {
  gotoxy(59,12);
  cout<<setiosflags(ios::fixed)  //fixed
      <<setiosflags(ios::showpoint)//always show point
      <<setprecision(2)//two decimal places
      <<item.item_rate;
      item.qty_in_stock=item.qty_in_stock-iq4;
      if(item.qty_in_stock<=0)
      item.qty_in_stock=0;
      amount=amount+(item.item_rate*iq4);
      item_file.seekg(n-sizeof(item));
      item_file.write((char*)&item,sizeof(item));
    }
    else
    {
    gotoxy(59,12);
    cout<<"NOT AVAILABLE";
    }
 }
 if(item.item_code==ic5)
 {
 if(item.vallidate(ic5,iq5))
 {
 gotoxy(59,13);
 cout<<setiosflags(ios::fixed)
     <<setiosflags(ios::showpoint)
     <<setprecision(2)
     <<item.item_rate;
 item.qty_in_stock=item.qty_in_stock-iq5;
 if(item.qty_in_stock<=0)
    item.qty_in_stock=0;
 amount=amount+(item.item_rate*iq5);
 item_file.seekg(n-sizeof(item));
 item_file.write((char*)&item,sizeof(item));
 }
 else
 {
 gotoxy(59,13);
 cout<<"NOT AVAILABLE";
 }
}
  item_file.read((char*)&item,sizeof(item));
  n=item_file.tellg();
  }
  item_file.close();
  return amount;
   }
     void item_list::purchase_order()
       {
       fstream item_file;
       int found=0;
       gotoxy(20,2);
       cout<<"PURCHASE ORDER LIST ON:"<<current_date.day<<"-"<<
       current_date.month<<"-"<<current_date.year;
       gotoxy(20,3);
       cout<<"--------------------------------------";
       gotoxy(22,5);
       cout<<"ITEM CODE";
       gotoxy(22,6);
       cout<<"--------------------";
       gotoxy(40,5);
       cout<<"CURRENT STOCK";
       gotoxy(40,6);
       cout<<"--------------------";
       int y=7;
       item_file.open("itemfile.date",ios::in);
       item_file.seekg(0);
       item_file.read((char*)&item,sizeof(item));
       while(!item_file.eof())
{                        int lt;
if(item.qty_in_stock&&lt>20)
 {
  gotoxy(25,y);
  cout<<item.item_code;
  gotoxy(43,y);
  cout<<item.qty_in_stock;
  y++;
  found=1;
 }
item_file.read((char*)&item,sizeof(item));
       }
       item_file.close();
       if(found==0)
{
gotoxy(15,15);
cout<<"NONE OF THE ITEMS ARE LESS THAN 20 IN STOCK";
gotoxy(20,16);
cout<<"NO PURCHASE ORDER";
}
       }
       node*item_list::create_list()
       {
       fstream item_file;
       item_file.open("itemfile.dat",ios::in); //open file in input mode
       item_file.seekg(0); //set the pointer to the begining of the file
       start=ptr=new node; //get new node from operating system
       item_file.read((char*)&item,sizeof(item)); //read first record
       while(!item_file.eof())
{
ptr->rec_no=item.item_code; //save record no. in the index
ptr->link=new node; //get new node for the record
ptr=ptr->link;
item_file.read((char*)&item,sizeof(item));    //read the next record
}
ptr->link=NULL; //end of the list
item_file.close();
return start;
}
void item_list::items_available()
{
fstream item_file;
clrscr();
gotoxy(20,2);
cout<<"ITEM AVAILABLE";
gotoxy(20,3);
cout<<"--------------";
gotoxy(10,5);
cout<<"ITEM CODE";
gotoxy(10,6);
cout<<"---------";
gotoxy(20,5);
cout<<"STOCK";
gotoxy(20,6);
cout<<"-----";
gotoxy(30,5);
cout<<"ITEM NAME";
gotoxy(30,6);
cout<<"---------";
gotoxy(40,5);
cout<<"ITEM RATE";
gotoxy(40,6);
cout<<"---------";
int y=7;
item_file.open("itemfile.dat",ios::in);
item_file.seekg(0);
item_file.read((char*)&item,sizeof(item));
while(!item_file.eof())
{
gotoxy(10,y);
cout<<item.item_code;
gotoxy(20,y);
cout<<item.qty_in_stock;
gotoxy(30,y);
cout<<item.item_name;
gotoxy(40,y);
cout<<item.item_rate;
y++;
item_file.read((char*)&item,sizeof(item));
}
item_file.close();
}
int sales_list::get_memo_no(date_rec current_date)
{
fstream sales_file;
int num;
sales_file.open("cashmemo.dat",ios::in);
sales_file.seekg(-sizeof(cash_memo),ios::end);
sales_file.read((char*)&cash_memo,sizeof(cash_memo));
if (cash_memo.cash_memo_date.day==current_date.day
&&cash_memo.cash_memo_date.month==current_date.month
&&cash_memo.cash_memo_date.year==current_date.year)
num=cash_memo_num+1;
else
num=1;
sales_file.close();
return num;
}
//this function enters an new item into a itemfile, calls gets_item()
void sales_list::update_sales_file(int memo_num,int ic1,int ic2,
int ic3,int ic4,int ic5,int iq1,int iq2,int iq3,int iq4,int iq5,float amount)
{
fstream sales_file;
cash_memo.cash_memo_num=memo_num;
cash_memo.cash_memo_date=current_date;
cash_memo.item_code1=ic1;
cash_memo.item_code2=ic2;
cash_memo.item_code3=ic3;
cash_memo.item_code4=ic4;
cash_memo.item_code5=ic5;
cash_memo.i_qty1=iq1;
cash_memo.i_qty2=iq2;
cash_memo.i_qty3=iq3;
cash_memo.i_qty4=iq4;
cash_memo.i_qty5=iq5;
cash_memo.total_amount=amount;
sales_file.open("cashmemo.dat",ios::out | ios::app);
//open file in attend mode
sales_file.seekg(0,ios::end);
sales_file.write((char*)&cash_memo,sizeof(cash_memo));
//write in the file
sales_file.close(); //close file
}

void sales_list::daily_sales_report(struct date_rec current_date)
{
fstream sales_file;
gotoxy(20,2);
cout<<"------------------";
gotoxy(20,3);
cout<<"SALES ON:"<<current_date.day<<"-"<<current_date.month<<" -"
<<current_date.year;
gotoxy(20,4);
cout<<"---------------------------";
gotoxy(20,6);
cout<<"ITEM CODE";
gotoxy(20,7);
cout<<"-----------";
gotoxy(40,6);
cout<<"QUANTITY SOLD";
gotoxy(40,7);
cout<<"---------------";
int y=8;
//sales_file.open("cashmemo.dat",ios::in);
ptr=start;
while(ptr->link!=NULL)
{
int qty=0;
sales_file.open("cashmemo.dat",ios::in);
sales_file.seekg(0,ios::beg);
sales_file.read((char*)&cash_memo,sizeof(cash_memo));
while(!sales_file.eof())
{
if(current_date.day==cash_memo_date.day&&current_date.month==
cash_memo_date.month&&current_date.year==cash_memo_date.year)
{
if(ptr->rec_no==cash_memo.item_code1)
 qty=qty+cash_memo.i_qty1;
if (ptr->rec_no==cash_memo.item_code2)
 qty=qty+cash_memo.i_qty2;
if(ptr->rec_no==cash_memo.item_code3)
 qty=qty+cash_memo.i_qty3;
if (ptr->rec_no==cash_memo.item_code4)
 qty=qty+cash_memo.i_qty4;
if(ptr->rec_no==cash_memo.item_code5)
 qty=qty+cash_memo.i_qty5;
}
sales_file.read((char*)&cash_memo,sizeof(cash_memo));
}
sales_file.close();
gotoxy(20,y);
cout<<ptr->rec_no;
gotoxy(40,y);
cout<<qty;
y++;
ptr=ptr->link;
}
//sales_file.close();
}


// MAIN FUNCTION
void main()
{
char ch;  int lt;
int key,main_choice,valid=0;
do
{
clrscr(); //clear screen
if (valid!=0)
{
gotoxy(25,11);
cout<<"INVALID DATE";
gotoxy(25,12);
cout<<"PRESS ANY KEY TO TRY AGAIN";
getch();
clrscr();
}
gotoxy(22,10);
cout<<"ENTER CURRENT DATE(dd/mm/yyyy)";
gotoxy(25,11);
cin>>current_date.day>>ch>>current_date.month>>
ch>>current_date.year;
valid=(current_date.day&lt>0)||(current_date.day>31)
 ||(current_date.month>12)||(current_date.month<=0)
 ||(current_date.year&lt>1998); //validate date
}while(valid !=0);

do
{
clrscr();
gotoxy(20,5);
cout<<"ABC DEPARTMENTAL STORE";
gotoxy(20,7);
cout<<"----------------";
gotoxy(20,7);
cout<<"-----------------";
gotoxy(22,10);
cout<<"SUPERVISOR ..........S";
gotoxy(22,12);
cout<<"CASHMEMO ...........C";
gotoxy(22,14);
cout<<"QUIT ...........Q";
main_choice=toupper(getch());
switch(main_choice)
{
case 'S':int s_choice;
do
{
clrscr();
gotoxy(28,2);
cout<<"---------------";
gotoxy(28,3);
cout<<"SUPERVISOR MODE";
gotoxy(28,4);
cout<<"----------------";
gotoxy(20,6);
cout<<"UPDATE STOCK ON PURCHASE     .....1";
gotoxy(20,8);
cout<<"TODAY'S SALES REPORT     .....2";
gotoxy(20,10);
cout<<"LIST OF ITEM AVAILABLE     .....3";
gotoxy(20,12);
cout<<"PURCHASE ORDER LIST     .....4";
gotoxy(20,14);
cout<<"EXIT SUPERVISOR MODE     .....5";
gotoxy(20,16);
cout<<"ENTER YOUR CHOICE ----------------->";
cin>>s_choice;
switch(s_choice)
{
case 1:int key;
do
{
item_list temp_item;
clrscr();
temp_item.get_item();
temp_item.update_on_purchase(temp_item);
gotoxy(18,24);
cout<<"CONTINUE:C QUIT:Q";
key=toupper(getch());
}
while(key!='Q');
break;
case 2: clrscr();
item.create_list();
cash_memo.daily_sales_report(current_date);
getch();
break;
case 3: item.items_available();
getch();
break;
case 4: clrscr();
item.purchase_order();
getch();
break;
case 5: break;
}
}
while(s_choice !=5);
break;
case 'C': do
{
int memo_num;
memo_num=cash_memo.get_memo_no(current_date);
clrscr();
gotoxy(24,1);
cout<<"------------------------------";
gotoxy(24,2);
cout<<"ABC DEPARTMENTAL STORE";
gotoxy(24,3);
cout<<"------------------------------";
gotoxy(30,5);
cout<<"CASHMEMO";
gotoxy(30,6);
cout<<"--------------------------------";
gotoxy(10,7);
textbackground(RED+BLINK);
cprintf("DATE:");
cout<<current_date.day<<"/"<<current_date.month<<"/"
<<current_date.year;
gotoxy(52,7);
cout<<"NO:"<<memo_num;
gotoxy(10,9);
cout<<"ITEM CODE  1:";
gotoxy(35,9);
cout<<"QTY:";
gotoxy(52,9);
cout<<"RATE";
gotoxy(10,10);
cout<<"ITEM CODE  2:";
gotoxy(35,10);
cout<<"QTY:";
gotoxy(52,10);
cout<<"RATE";
gotoxy(10,11);
cout<<"ITEM CODE  3:";
gotoxy(35,11);
cout<<"QTY:";
gotoxy(52,11);
cout<<"RATE:";
gotoxy(10,12);
cout<<"ITEM CODE  4:";
gotoxy(35,12);
cout<<"QTY:";
gotoxy(52,12);
cout<<"RATE:";
gotoxy(10,13);
cout<<"ITEM CODE  5:";
gotoxy(35,13);
cout<<"QTY:";
gotoxy(52,13);
cout<<"RATE:";
gotoxy(10,15);
cout<<"TOTAL AMOUNT:";
int ic1,ic2,ic3,ic4,ic5;
int iq1,iq2,iq3,iq4,iq5;
ic1=ic2=ic3=ic4=ic5=0;
iq1=iq2=iq3=iq4=iq5=0;
gotoxy(24,9);
cin>>ic1;
gotoxy(41,9);
cin>>iq1;
gotoxy(24,10);
cin>>ic2;
gotoxy(41,10);
cin>>iq2;
gotoxy(24,11);
cin>>ic3;
gotoxy(41,11);
cin>>iq3;
gotoxy(24,12);
cin>>ic4;
gotoxy(41,12);
cin>>iq4;
gotoxy(24,13);
cin>>ic5;
gotoxy(41,13);
cin>>iq5;
float total_amount=0;
total_amount=
total_amount=item.update_on_sale(ic1,ic2,ic3,ic4,ic5,
      iq1,iq2,iq3,iq4,iq5);
gotoxy(25,15);
cout<<setiosflags(ios::fixed)
<<setiosflags(ios::showpoint)
<<setprecision(2)<<total_amount;
cash_memo.update_sales_file(memo_num,ic1,ic2,ic3,ic4,
      ic5,iq1,iq2,iq3,iq4,iq5,total_amount);
gotoxy(22,24);
cout<<"QUIT CASHMEMO:Q    CONTINUE:C";
key=toupper(getch());
}
while(key!='Q');
break;
case'Q':  exit(0);
break;
}
}
while(main_choice!='Q');
getch();
}