Task:

Design a vending machine which does the following:

Accepts coins of 1, 5, 10, 25, 50 cents or notes of 1 and 2

User selections: Candy, snacks, nuts, Coke, Pepsi and soda

Allow user by cancelling the request, returns the product and change,

Note : i understand the need of using std::cin/std::cout etc,. Just for simplicity i have not made this one particular change. Will start making this change with my future codes.

Also please if you can rate this code out of 10 for usage of design principles and where all i can apply them and which one.

Also i have been asked to use pointers and memory management.

#include <iostream>     using namespace std;      class product         {             public :             const int MAX_STOCK = 10;              string *name = new string;             int *price = new int,                 *remaining_stock = new int;              product(string n, int p)                 {                     *price = p;                     *name = *name + n;                     *remaining_stock = MAX_STOCK;                 }             ~product()                 {                     delete price;                     delete name;                     delete remaining_stock;                 }         }; 

Class for money :

  class money         {             public :              int *max = new int;             int *accepted_values = new int[10];             int i;             money()                 {                 }             money(int *a, int how_many)                 {                     *max = how_many;                     //cout<<"\n this is max now : "<<*max;                         for (i=0; i<how_many; i++)                             {                                 *(accepted_values + i) = a[i];                                 //cout<<"\n inside money : "<<i<<" accepted value is "<<*(accepted_values + i)<<" value is a is :"<<a[i]<<endl;                             }                            }             int check(int value, int loop_max)                 {                     //cout<<"\nInside money checker, the value of max is :"<<loop_max;                     bool present = 0;                     //cout<<"\nInside money checker, the value of present is :"<<present;                     for(i=0; i< loop_max; i++)                         {                             //cout<<"\n Accepted values - "<<i<<" is : "<<*(accepted_values + i)<<" value is :"<<value;                             if (value == *(accepted_values + i))                             {                                 //cout<<"\n value present!";                                 present = 1;                             }                         }                     if(!present)                         {                             //cout<<"\n not present and present is now : "<<present;                             value = 0;                         }                     return value;                 }             ~money()                 {                     delete max;                     delete accepted_values;                 }         }; 

Class vending machine :

    class Vending_machine         {             public :              product *candy = new product("Candy",10);             product *snack = new product("Snack",50);             product *nuts = new product("Nuts",90);             product *coke = new product("Coke",25);             product *soda = new product("Soda",45);              int accepted_coins[5] = {1,5,10,25,50};             int accepted_notes[2] = {1,2};              money *coins = new money(accepted_coins, 5);             money *notes = new money(accepted_notes, 2);              int *amount_deposited = new int;              Vending_machine()                 {                     *amount_deposited = 0;                 }             Vending_machine(bool reset)                 {                        if (reset == true)                         {                             *amount_deposited = 0;                             //delete candy;                             //delete snack;                             //delete nuts;                             //delete coke;                             //delete soda;                             //delete coins;                             //delete notes;                              product *candy = new product("Candy",10);                             product *snack = new product("Snack",50);                             product *nuts = new product("Nuts",90);                             product *coke = new product("Coke",25);                             product *soda = new product("Soda",45);                             }                 }             ~Vending_machine()                 {                     delete candy;                     delete snack;                     delete nuts;                     delete coke;                     delete soda;                     delete coins;                     delete notes;                     delete amount_deposited;                 }             void get_money(int choice,int value)                 {                     switch(choice)                         {                             case(1):                                 //cout<<"\nthis is the value of amount deposited before : "<<*amount_deposited;                                 *amount_deposited = coins->check(value, *coins->max);                                 //cout<<"\nthis is the value of amount deposited after : "<<*amount_deposited;                             break;                             case(2):                                 //cout<<"\nthis is the value of amount deposited before : "<<*amount_deposited;                                 *amount_deposited = notes->check(value, *notes->max) * 100;                                 //cout<<"\nthis is the value of amount deposited after : "<<*amount_deposited;                             break;                             default:                                 *amount_deposited = 0;                         }                 }             void compare_availability(int *remain, int *price)                 {                     try                     {                         if(*remain !=0 && *amount_deposited >= *price)                             {                                 *remain -= 1;;                                 *amount_deposited -= *price;                                 cout<<"\n Dispatched";                                 return_money('Y');                             }                         else if (*amount_deposited < *price)                             {                                 throw "Amount deposited is low";                             }                         else if (*remain == 0)                             {                                 throw "Stock not available";                             }                         else                             {                                 throw "Unknown error";                             }                     }catch (const char* msg)                         {                             cout<<msg<<endl;                         }                 }             void get_selection(int selection)                 {                     switch(selection)                         {                             case (1):                                 compare_availability(candy->remaining_stock, candy->price);                             break;                             case (2):                                 compare_availability(snack->remaining_stock, snack->price);                             break;                             case (3):                                 compare_availability(nuts->remaining_stock, nuts->price);                             break;                             case (4):                                 compare_availability(coke->remaining_stock, coke->price);                             break;                             case (5):                                 compare_availability(soda->remaining_stock, soda->price);                             break;                             default:                                 cout<<"Wrong selection !"<<endl;                         }                 }             void return_money(char choice)             {                 if (*amount_deposited != 0)                     {                          if (choice == 'Y' || choice == 'y')                             {                                 cout<<"\n Your remaining change is : " << *amount_deposited/100.0 <<" $   \n";                                 *amount_deposited = 0;                             }                     }             }         }; 

main :

    int main()          {             int main_select, main_coin_note, main_val;             char change_your_mind;             Vending_machine *a = new Vending_machine(1);             cout<<"Coin(1) or Note(2) : ";             cin>>main_coin_note;             cout<<"Enter your denomination :";             cin>>main_val;             a->get_money(main_coin_note, main_val);              if (*a->amount_deposited == 0)                 {                     cout<<"\n Wrong denomination, Value returned !";                 }             else                 {                     cout<<"\tEnter what product you want :"<<endl<<"\t\t1 for Candy"<<endl<<"\t\t2 for Snack"<<endl<<"\t\t3 for Nuts"<<endl<<"\t\t4 for Coke"<<endl<<"\t\t5 for Soda\n\t :..";                     cin>>main_select;                     cout<<"\n You want to cancel request?(Y/N) :";                     cin>>change_your_mind;                         if (change_your_mind == 'Y' || change_your_mind == 'y')                             {                                 a->return_money(change_your_mind);                             }                         else                             {                                 a->get_selection(main_select);                             }                 }         }