Question

q13 c++
if answering please do not write code in paragrapth form.

13. Drink Machine Simulator Write a program that simulates a soft drink machine. The program should use a structure that stores the following data: Drink Name Drink Cost Number of Drinks in Machine The program should create an array of five structures. The elements should be initialized with the following data: Drink Name Cost Number in Machine Cola .75 20 Root Beer .75 20 Lemon-Lime .75 20 Grape Soda .80 20

Answer 1

#include <iostream>
#include <iomanip>
#include <string>
using namespace std;

// Defines a structure to store drink inventory
struct DrinkMachine
{
// Data member to store drink information
string drinkName;
double cost;
int numberInMachine;
};// End of structure

// Function to display drink information
void showDrinks(DrinkMachine dm[], int len)
{

cout<<"\n\n ******************** Drinks Available ********************\n";
cout<<left<<setw(8)<<"Index"<<setw(20)<<"Drink Name"<<setw(10)<<"Cost"<<setw(20)<<"Number In Machine"<<endl;

// Loops till number of drinks available
for(int c = 0; c < len; c++)
// Displays the current drink
cout<<setw(8)<<(c)<<setw(20)<<dm[c].drinkName<<fixed<<setprecision(2)<<setw(10)<<dm[c].cost
<<setw(20)<<dm[c].numberInMachine<<endl;
}// End of function

// Function to return valid drink name entered by the user
// Returns the index position
int validDrink(DrinkMachine dm[], int len)
{
// To store the number entered by the user
int no;

// Loops till valid index entered by the user
do
{
// Accepts drink name index from the user
cout<<"\n Enter the drink index number: ";
cin>>no;

// Checks if the number is greater than or equals to 0 and less than length
if(no >= 0 && no < len)
// return the index
return no;

// Otherwise displays error message
else
cout<<"\n\t Invalid index. Try again.";
}while(1); // End of do - while loop
}// End of function

// Function to return valid cost entered by the user
double validCost(DrinkMachine dm[], int len, double productCost)
{
// To store the number entered by the user
double amount;

// Loops till valid amount entered by the user
do
{
// Accepts amount from the user
cout<<"\n Enter the amount: ";
cin>>amount;

// Checks if the amount is greater than or equals to 1.0
if(amount >= 1.0)
// Checks if the amount is greater than or equals to the purchased cost
if(amount >= productCost)
// Returns the amount
return amount;
else
cout<<"\n Insufficient amount. Product cost is: $"<<productCost;
// Otherwise displays error message
else
cout<<"\n\t Invalid cost. Try again.";
}while(1); // End of do - while loop
}// End of function

// main function definition
int main()
{
// Creates an array of object and assigns data
DrinkMachine dm[] =
{
{"Cola", 75.0, 20}, {"Root Beer", 75.0, 20}, {"Lemon Lime", 75.0, 20},
{"Grape Soda", 80.0, 20}, {"Cream", 80.0, 20}
};// End of initialization

// Calculates number of records
int len = sizeof(dm) / sizeof(dm[0]);

int choice;
int index;
double amount;

// Loops till user choice is not 2
do
{
// Calls the function to display drinks information
showDrinks(dm, len);

// Displays menu and accepts user choice
cout<<"\n 1 - Pick a drink. \n 2 - Exit. \n\t What is your choice? ";
cin>>choice;

// Checks if choice is 2 then stop the loop
if(choice == 2)
break;

// Otherwise checks if choice is 1
else if(choice == 1)
{
// Calls the function to accept valid drink
// Stores the return index
index = validDrink(dm, len);

// Checks if required drink quantity is not 0
if(dm[index].numberInMachine != 0)
{
// Calls the function to accept valid amount
amount = validCost(dm, len, dm[index].cost);

// Subtracts one quantity
dm[index].numberInMachine--;

// Checks if amount paid is greater than the product cost
if(amount > dm[index].cost)
// Calculates and displays change returned
cout<<"\n Take your change: $"<<(amount - dm[index].cost);
}// End of if condition

// Otherwise quantity is 0. Display error message
else
cout<<"\n Product is sold out.";
}// End of else if condition

// Otherwise invalid choice
else
cout<<"\n Invalid choice!!";

}while(1);// End of do - while loop
return 0;
}// End of main function

Sample Output:

Index 1 2 3 4 Drink Name Cola Root Beer Lemon Lime Grape Soda Cream Drinks Available Cost Number In Machine 75.00 20 75.00 20 75.00 20 80.00 20 80.00 20 Index 0 1 12 13 14 *** Drinks Available ****** Drink Name Cost Number In Machine Cola 75.00 20 Root Beer 75.00 20 Lemon Lime 75.00 20 Grape Soda 80.00 20 Cream 80.00 19 1 - Pick a drink. 2 - Exit. What is your choice? 9 Invalid choice!! 1 - Pick a drink. 2 - Exit. What is your choice? 2 Index Drink Name Cola Root Beer Lemon Lime Grape Soda Cream Drinks Available Cost Number In Machine 75.00 20 75.00 20 75.00 20 80.00 20 80.00 20 2 3 4 1 - Pick a drink. 2 - Exit. What is your choice? 1 Enter the drink index number: 7 Invalid index. Try again. Enter the drink index number: 4 Enter the amount: 20 Insufficient amount. Product cost is: $80.00 Enter the amount: 0 Invalid cost. Try again. Enter the amount: 90 Take your change: $10.00