Q)A common place to buy candy is from a machine. A new candy machine has been purchased for the gym, but it is not working properly. The machine sells candies, chips, gum, and cookies. You have been asked to write a program for this candy machine so that it can be put into operation.
 The program should do the following:  Show the customer the different products sold by the candy machine.  Let the customer make the selection.  Show the customer the cost of the item selected.  Accept money from the customer.  Release the item.

#include<iostream>

using namespace std;

class candy_M {

      string items[4];//intialized by constructor the name of the items

      double price[4]; //intilized by constructor the price of items

      int choice; //stores the choice of item to be selected

      double E_amount; //stores the Amount entered by the user

      double r_amount; //stores the reaming amount if the entered amount is greater than the item price

public:

      candy_M(); //constructor

      void menu(); //declaration of a function  display the menu of items

      void set_Choice(int);  //declaration of a function set the choice entered ny the user

      void set_amount(double); //declaration of a function  set the Amount entered ny the user

      void check_Amount()const; //declaration of a function  check wheather the amont entered is ==  or > or < then the items price

};

int main()

{

      int ch;

      double am;

      candy_M M1; //creating object

      M1.menu(); //display menu

      while (!(cin >> ch) || (ch>4 || ch <= 0)) //takes the choice and checking it if it is valid or not

      {

            cin.clear();

            cin.ignore(900, '\n');

            cout << "  Invalid choice!\nAgain Enter the Choice:";

      }

      M1.set_Choice(ch);

      cout << "Enter the Amount :";

      while (!(cin >> am) || (am <= 0)) //takes the Amount and checking it if it is valid or not

      {

            cin.clear();

            cin.ignore(900, '\n');

            cout << "  Invalid Amount!\nAgain Enter the Amount:";

      }

      M1.set_amount(am);

      M1.check_Amount();

      return 0;

}

void candy_M::menu()//function  display the menu of items

{

      cout << "**************CANDY MACHINE*****************\n";

      cout << "\t 1 for Chips          RS 50.\n";

      cout << "\t 2 for Candies        RS 20.\n";

      cout << "\t 3 for Gum            RS 10.\n";

      cout << "\t 4 for Cookies        RS 40.\n";

      cout << "Enter your Choice :";

}

void candy_M::set_Choice(int ch) //function set the choice entered ny the user

{

      choice = ch - 1;

}

void candy_M::set_amount(double p) //function set the Amount entered ny the user

{

      E_amount = p;

}

void candy_M::check_Amount()const //function  check wheather the amont entered is ==  or > or < then the items price

{

      double am = E_amount - price[choice];

      if (am > 0)

      {

            cout << "Take the Remaining Money\n";

            cout << "You the purchased the item\nTake the item\n";

      }

      else if (am == 0)

            cout << "You the purchased the item\nTake the item";

      else

            cout << "\nYou have entered the Amount less than the price of an item\n";

}

candy_M::candy_M() //Constructor

{

      items[0] = "Chips";

      items[1] = "Candies";

      items[2] = "Gum";

      items[3] = "Cookies";

      price[0] = 50;

      price[1] = 20;

      price[2] = 10;

      price[3] = 40;

}