Question

You has been requested to design and develop a food ordering system in C++ language based on following requirements:

The system shall allow the user to place an order for the food(s), view the food details, modify or delete the details of the food if necessary. Your program should be menu driven, giving the user various choices. You shall design the system by demonstrating the full understanding of object-oriented and use of list/link-list concept.

For every food order, the following information will be stored: Order ID (Auto assigned, unique ID), Food Code, flavor (example: Strawberry, chocolate), weight (Kg), Unit Price, Qty and customer information who order this cake. The customer information consists of customer ID, name, address and contact number. The order ID shall be automatically assigned with a unique ID when new order is added. The system shall display additional information that is amount (unit price * qty) when viewing the order details.

Answer 1

#include<iostream>
#include<fstream>
#include<string.h>
#include<conio.h>
#include<cstdio>
#include<stdlib.h>
using namespace std;
struct r{
    char dish[50];
    int key;
    float price;
}r;
class Resturant
{
public:
    void create();
    void query();
    void display();
    void update();
    void delet();
    void admin();
};
void Resturant::create()
{
    char a;
    int k;
    fstream obj;
    top:
    do {
        obj.open("resturant.txt",ios::in|ios::binary);
        cout<<"enter the dish key:";
        cin>>k;
         while(obj.read((char*)&r,sizeof(r)))
            {
                if(r.key==k)
                {
                    cout<<"key is already exist"<<endl;
                    obj.close();
                goto top;
                }
            }
        obj.close();
        obj.open("resturant.txt",ios::app|ios::binary);
        r.key=k;
        cin.ignore();
        cout<<"ENTER THE DISH NAME:";
        gets(r.dish);
        cout<<"ENTER THE DISH PRICE:";
        cin>>r.price;
        obj.write((char*)&r,sizeof(r));
        cout<<"do you want to add an other [y/n]:";
        cin>>a;
        obj.close();
    }
    while(a!='n');
}
void Resturant::display()
{
      int c=0;
     fstream obj;
     obj.open("resturant.txt",ios::in|ios::binary);
    cout<<"\tKey\t\tDISH NAME\t\tPRICE"<<endl;
    while(obj.read((char*)&r,sizeof(r)))
    {
            cout<<"\t"<<r.key<<"\t\t"<<r.dish<<"\t\t\t"<<r.price<<endl;
            c++;
    }
    if(c==0)
    {
        cout<<"list is empty"<<endl;
    }
    obj.close();
}
void Resturant::query()
{
     int a,c=0;
     fstream obj;
     obj.open("resturant.txt",ios::in);
    cout<<"enter the dish key:";
    cin>>a;
    while(obj.read((char*)&r,sizeof(r)))
    {
           if(r.key==a)
           {
            cout<<"\t"<<r.key<<"\t\t"<<r.dish<<"\t\t\t"<<r.price<<endl;
            c++;
           }
    }
    if(c==0)
    {
        cout<<"not found"<<endl;
    }
    obj.close();
}
void Resturant::update()
{
     int a,p,c=0;
     fstream obj;
     obj.open("resturant.txt",ios::in|ios::out|ios::binary);
    cout<<"enter the dish key:";
    cin>>a;
    obj.seekg(0);
    while(obj.read((char*)&r,sizeof(r)))
    {
        if(r.key==a)
        {
            cout<<"destinatio record:"<<endl;
            cout<<"\t"<<r.key<<"\t\t"<<r.dish<<"\t\t\t"<<r.price<<endl;
            p=obj.tellg()-(sizeof(r));
            obj.seekp(p);
            cout<<"enter the dish key:";
            cin>>r.key;
            cin.ignore();
            cout<<"ENTER THE DISH NAME:";
             gets(r.dish);
            cout<<"ENTER THE DISH PRICE:";
            cin>>r.price;
            obj.write((char*)&r,sizeof(r));
            c++;
           }

        }
        if(c==0)
        {
            cout<<"not found"<<endl;
        }

    obj.close();
}
void Resturant::delet()
{
     int a,c;
     fstream obj,obj1;
     obj.open("resturant.txt",ios::in|ios::binary);
     obj1.open("temp.txt",ios::app|ios::binary);
    cout<<"enter the dish key:";
    cin>>a;
    while(obj.read((char*)&r,sizeof(r)))
    {
        if(r.key==a)
        {
            c++;
            cout<<"\t"<<r.key<<"\t\t"<<r.dish<<"\t\t\t"<<r.price<<endl;
            cout<<"destination record is deleted"<<endl;
        }
        if(r.key!=a)
        {
            obj1.write((char*)&r,sizeof(r));
           }
    }
    obj.close();
    obj1.close();
    if(c==0)
       {
         cout<<"not found"<<endl;
       }
    remove("resturant.txt");
    rename("temp.txt","resturant.txt");
}
 void Resturant::admin()
{
char a;
    do{

            cout<<"\n\t\t\t\t\t\t|||||||||||||||||||||||||"<<endl;
            cout<<"\t\t\t\t\t\t|                       |"<<endl;
            cout<<"\t\t\t\t\t\t|  1) ADD DISH          |"<<endl;
            cout<<"\t\t\t\t\t\t|  2) Display           |"<<endl;
            cout<<"\t\t\t\t\t\t|  3) QUERY             |"<<endl;
            cout<<"\t\t\t\t\t\t|  4) UPDATE            |"<<endl;
            cout<<"\t\t\t\t\t\t|  5) DELETE            |"<<endl;
            cout<<"\t\t\t\t\t\t|  0) EXIT TO MAIN MANU |"<<endl;
            cout<<"\t\t\t\t\t\t|                       |"<<endl;
            cout<<"\t\t\t\t\t\t|||||||||||||||||||||||||"<<endl;
            cout<<"\t\t\t\t\t\tselect the key";
            cin>>a;
            switch(a)
            {
            case '0':
                break;
            case '1':
                system("CLS");
               create();
                break;
            case '2':
                system("CLS");
               display();
                break;
            case '3':
                system("CLS");
               query();
                break;
            case '4':
                system("CLS");
               update();
                break;
            case '5':
                system("CLS");
             delet();
                break;
            }
    }
    while(a!='0');
}
struct {
char d[50];
float p,amount;
int qty;
}rd;
class custmer:public Resturant
{
public:
    void bill();
    void showbill();
    void dish_menu();
};
void custmer::bill()
{
     int a,c=0;
     char ch;
     float total=0;
    fstream obj,obj1;
    dish_menu();
    obj1.open("bill.txt",ios::out|ios::binary);
     do{
    obj.open("resturant.txt",ios::in|ios::binary);
    cout<<"enter the dish key:";
    cin>>a;
    while(obj.read((char*)&r,sizeof(r)))
    {
           if(r.key==a)
           {
            c++;
            cout<<"enter the quantity:";
            cin>>rd.qty;
            rd.amount=rd.qty*r.price;
            cout<<"\t"<<r.dish<<"\t\t"<<r.price<<"*"<<rd.qty<<"\t\t"<<rd.amount<<endl;
            strcpy(rd.d,r.dish);
            rd.p=r.price;
            obj1.write((char*)&rd,sizeof(rd));
            total=total+rd.amount;
           }
        }
        if(c==0)
     {
        cout<<"not found"<<endl;
     }

    cout<<"do you want to order more [y/n]";
    cin>>ch;
    obj.close();
     }
     while(ch!='n');
    obj1.close();
    cout<<"||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||"<<endl;
    cout<<"|||||||||||||||||||||||||||||||||||||||||||||||| BILL  |||||||||||||||||||||||||||||||||||||||||||||||||||||||"<<endl;
     cout<<"||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||"<<endl;
    showbill();
    cout<<"||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||"<<endl;
    cout<<"|||\t\t\t\t\t\t\t   TOTAL="<<total<<"\t\t\t\t\t   |||"<<endl;
    cout<<"||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||"<<endl;
}
 void custmer::showbill(){
    fstream obj;
    obj.open("bill.txt",ios::in|ios::binary);
    cout<<"\tDISH NAME\t\tPRICE\t\tQTY\t\tAMOUNT"<<endl;
    while(obj.read((char*)&rd,sizeof(rd)))
    {

            cout<<"\t"<<rd.d<<"\t\t\t"<<rd.p<<"\t\t"<<rd.qty<<"\t\t"<<rd.amount<<endl;


    }
    obj.close();
 }
 void custmer::dish_menu()
 {
      fstream obj;
     obj.open("resturant.txt",ios::in|ios::binary);
    while(obj.read((char*)&r,sizeof(r)))
    {


            cout<<"\t\t"<<r.key<<") "<<r.dish<<"-------RS  "<<r.price<<endl;
    }
    obj.close();
 }
int main()
{
    char a;
    custmer obj;
    do
    {
        cout<<"\n\t\t\t\t\t\t||||||||||||||||||||"<<endl;
        cout<<"\t\t\t\t\t\t|                  |"<<endl;
        cout<<"\t\t\t\t\t\t|    1)Admin       |"<<endl;
        cout<<"\t\t\t\t\t\t|    2)custmer     |"<<endl;
        cout<<"\t\t\t\t\t\t|    0)Exit        |"<<endl;
        cout<<"\t\t\t\t\t\t|                  |"<<endl;
        cout<<"\t\t\t\t\t\t||||||||||||||||||||"<<endl;
        cout<<"\t\t\t\t\t\tselect the manu";
        cin>>a;
        switch(a)
        {
        case '0':
            break;
        case '1':
             system("CLS");
            obj.admin();
            break;
        case '2':
             system("CLS");
            obj.bill();
            break;
        }
    }
    while(a!='0');

}