can you please tell me what's wrong with this program

[rishabh 2212]

#include<conio.h>
#include<iostream.h>
#include<stdio.h>
#include<process.h>
#include<fstream.h>
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;
}
};
fstream fp;
product pr;
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();
}
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";

}
fp.close();
getch();
}
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();
}
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();
}
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();
}
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();
}
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();
}
void intro()
{
clrscr();
gotoxy(31,11);
cout<<"CLASSIC ELECTRICALS";
gotoxy(35,14);
cout<<"BILLING";
gotoxy(35,17);
cout<<"PROJECT";
cout<<"\n\nMADE BY : RISHABH JAIN";
cout<<"\n\nSCHOOL : SICA SS SCHOOL";
getch();
}
void admin_menu()
{
clrscr();
{
int pass=12345,passch;
cout<<"\n_____ENTER THE PASSWORD-_____\n";
cin>>passch;
if(passch==pass)
{
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=getch();
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();
}
}
else
{
cout<<"ENTER CORRECT PASSWORD ";
exit(0);
}
}
class employee
{
int b_salary;
char name[20],address[30];
public:
float net_salary;
void getdata()
{
cout<<"name of the employee-";
cout<<"address of the employee-";
}
void getsalary()
{
cout<<"salary of the employee=";
}
float cal()
{
float da,hra,md;
da=(40*b_salary)/100;
hra=(10*b_salary)/100;
md=(5*b_salary)/100;
float net_salaray=b_salary=da=hra=md;
return net_salary;
}
void display()
{
cout<<name<<"has the following address and salary\n";
cout<<address<<endl;
cout<<cal();
}
};
void main()
{
char ch;
intro();
do
{
clrscr();
cout<<"\n\n\n\tMAIN MENU";
cout<<"\n\n\t01. CUSTOMER";
cout<<"\n\n\t02. EMPLOYEE";
cout<<"\n\n\t03. ADMINISTRATOR";
cout<<"\n\n\t04. EXIT";
cout<<"\n\n\tPlease Select Your Option (1-4) ";
ch=getche();
switch(ch)
{
case 1:
clrscr();
place_order();
break;
case 2:
admin_menu();
break;
case 3:
employee compfu[100];
int n;
cin>>n;
for(int i=0;i<n;i++)
{
cout<<Enter number<<i<<"details:\n\n";
comfu[i].getdata();
compfu[i].getsalary();
}
for(int i=0;i<=100)
{
compfu[i].display();
}
break;
case 4:
exit(0);
default :
cout<<"\a";
}
}while(ch!='4');

getch();
}

[ShiftLeft]

After fixing #include's to point to proper headers, there are 89 errors. So pretty much everything is wrong with your program.