Question

Drink Machine Simulator

The purpose of this exercise is to give you practice with abstract data types, namely structures and arrays of structures.Write a program that simulates a softdrink 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
Coca-Cola .75 20
Root Beer .75 20
Sprite .75 20
Spring Water .80 20
Apple Juice .80 20

Please see the input file ("DrinkMachineInventory.txt"). Each time the program runs, it should read the data from the input file and then enter a loop thatperforms the following steps: A list of drinks is displayed on the screen. The user should be allowed to either quit the program or pick a drink. If the userselects a drink, he or she will next enter the amount of money that is to be inserted into the drink machine. The program should display the amount of change thatwould be returned and subtract one from the number of that drink left in the machine. If the user selects a drink that has sold out, a message should be displayed.The loop then repeats. When the user chooses to quit the program it should display the total amount of money the machine earned.
Input Validation: Only accept positive values for the amount of money. Also, do not accept values greater than $1.00.
Your code should be modular (use functions) and pass variables (by value/by reference) where appropriate. Also, use named constants whereappropriate

DrinkMachineInventory.txt-
Coca-Cola 0.75 20
Root Beer 0.75 20
Sprite 0.75 20
Spring Water 0.80 20
Apple Juice 0.95 20

Answer 1

// C++ program for Drink Machine Simulator:

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

struct Machine
{
string name;
double cost;
int num;
};

void init(Machine []);
int menu(Machine[]);
void payment(double);

int main()
{
Machine drink[5];
int choice;
double made=0;
init(drink);
choice=menu(drink);
while(choice!=5)
{
payment(drink[choice].cost);
made+=drink[choice].cost;
drink[choice].num--;
choice=menu(drink);
}
cout<<"Today the machine has made $"<<setprecision(2)<<fixed<<made<<endl;
system("pause");
return 0;
}

void payment(double p)
{
double pay;
cout<<"Your drink costs $"<<setprecision(2)<<fixed<<p<<endl;
cout<<"Enter payment: ";
cin>>pay;
while(pay<0||pay>1.||pay<p)
{
cout<<"please insert the correct amount for your drink!n";
cout<<"maximum payment is $1.00n";
cout<<"Enter payment: ";
cin>>pay;
}
cout<<"Your change is: $"<<setprecision(2)<<fixed<<pay-p<<endl;
return;
}

void init(Machine d[])
{
ifstream infile("DrinkMachineInventory.txt");

if(infile.fail())
{
cout << "Could not find the file DrinkMachineInventory.txt n";
cout << "Exiting the programn";
exit(0);
}

int i=0;
char ch;
string word= "";

while(!infile.eof())
{
word= "";
ch = infile.get();
while(true)
{
if(isdigit(ch) || ch == 'n')
break;
else
word += ch;
ch = infile.get();
}

if(word != "")
{
d[i].name = word;
infile >> d[i].cost >> d[i].num ;
i++;
}
}

infile.close();
}

int menu(Machine d[])
{
int choice=8,i;
bool soldout=true;
while((choice<1||choice>6)||soldout)
{
soldout=false;
cout<<"Menun";
cout<<" Drink Costtleftn";
for(i=0;i<5;i++)
{
cout<<i+1<<". "<<setw(15)<<left<<d[i].name<<setw(5);
cout<<setprecision(2)<<fixed<<d[i].cost<<"t"<<d[i].num<<endl;
}
cout<<"6. Exitn";
cout<<"Enter Choice ";
cin>>choice;
if(choice<1||choice>6)
cout<<"invalid entryn";
else
if(d[choice-1].num==0)
{cout<<"sold outn";
soldout=true;
}
}
return choice-1;
}

DrinkMachineInventory.txt file:

Sample output:

I hope this would helpful for you......