Question

NOTE #1: NO GLOBALS, In addition programs with infinite while(true) loops or improper breaks etc.

NOTE #2: MAKE YOUR PROGRAM AS EFFICIENT AS POSSIBLE.

Drink Machine Simulator - Based on Structures Lecture

Write a c++ program that simulates a soft drink machine. The program should use a structure named Drink that contains the following information:

the drink name

the drink cost

the number of drinks in the machine

The program should then create an array of 5 Drink structures. The elements should be initialized with the following data.

Drink Name	Cost	Number in Machine
Cola	.65	20
Root Beer	.70	20
Lemon-Lime	.75	20
Grape Soda	.85	20
Water	.90	20

Every time the program runs it should enter a loop that performs the following steps. A list of drinks is displayed on the screen. The user should be allowed to quit the program or select a drink. You can have the user select a drink any way you want. One way would be to have the menu display with a number next to each drink.

If the user selects 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 that would be returned and subtract one from the number of that drink left in the machine. If the user selects a drink that is sold out a message should be displayed. The loop then repeats asking the user if they want to quit or select another drink. When the user choose the quit the program it should display the total amount of money the machine earned.

Input Validation: When the user enters an amount of money do not accept negative values or values greater than $1.00.

View required output

Test Case 1

Standard Input
1ENTER .9ENTER 7ENTER 7ENTER 1ENTER .5ENTER 1ENTER 4ENTER 1ENTER 2ENTER 1ENTER 5ENTER .95ENTER 3ENTER .2ENTER .8ENTER 6

SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.25\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Invalid selection. Please try again.\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Invalid selection. Please try again.\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: Please enter an amount between $0.00 and $1.00.\n
It should also be equal to or greater than the drink price : \n
CHANGE : $0.35\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.15\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.30\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.05\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: Please enter an amount between $0.00 and $1.00.\n
It should also be equal to or greater than the drink price : \n
CHANGE : $0.05\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: \n
SOFT DRINK MACHINE REPORT\n
--------------------------\n
Total amount earned: $4.50\n
\n

Test Case 2

Standard Input
1ENTER .9ENTER 1ENTER .9ENTER 1ENTER .9ENTER 1ENTER .9ENTER 1ENTER .9ENTER 1ENTER .9ENTER 1ENTER .9ENTER 1ENTER .9ENTER 1ENTER .9ENTER 1ENTER .9ENTER 1ENTER .9ENTER 1ENTER .9ENTER 1ENTER .9ENTER 1ENTER .9ENTER 1ENTER .9ENTER 1ENTER .9ENTER 1ENTER .9ENTER 1ENTER .9ENTER 1ENTER .9ENTER 1ENTER .9ENTER 1ENTER 1ENTER 1ENTER 1ENTER 1ENTER 1ENTER 2ENTER 1ENTER 3ENTER 1ENTER 6

SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.25\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.25\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.25\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.25\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.25\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.25\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.25\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.25\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.25\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.25\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.25\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.25\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.25\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.25\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.25\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.25\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.25\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.25\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.25\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.25\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Sorry. This drink is sold out.\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Sorry. This drink is sold out.\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Sorry. This drink is sold out.\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Sorry. This drink is sold out.\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Sorry. This drink is sold out.\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Sorry. This drink is sold out.\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.30\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: Please enter the amount you want to insert: \n
CHANGE : $0.25\n
\n
SOFT DRINK MACHINE\n
------------------\n
1) Cola ($0.65)\n
2) Root Beer ($0.70)\n
3) Lemon-Lime ($0.75)\n
4) Grape Soda ($0.85)\n
5) Water ($0.90)\n
6) Quit Program\n
\n
Please make a selection: \n
SOFT DRINK MACHINE REPORT\n
--------------------------\n
Total amount earned: $14.45\n
\n

Answer 1

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

// Drink structure
struct Drink
{
string name;
double cost;
int number;
};

// Method which displays menu
// Asks user to enter a choice
// Validates the choice
// And returns it
int menu()
{
int choice;
cout<<"SOFT DRINK MACHINE\n"<<endl;
cout<<"------------------\n"
"1) Cola ($0.65)\n"
"2) Root Beer ($0.70)\n"
"3) Lemon-Lime ($0.75)\n"
"4) Grape Soda ($0.85)\n"
"5) Water ($0.90)\n"
"6) Quit Program\n"<<endl;

cout<<"Please make a selection: ";
cin>>choice;

// If entered choice is not between 1-6, ask user to enter it again
while(choice<1 || choice>6)
{
cout<<"Invalid selection. Please try again."<<endl;
cout<<"Please make a selection: ";
cin>>choice;
}
return choice;
}

int main()
{
// Create 5 drink structures
// Assign values to their variables
Drink d1,d2,d3,d4,d5;
d1.name = "Cola";
d1.cost = 0.65;
d1.number = 20;

d2.name = "Root Beer";
d2.cost = 0.70;
d2.number = 20;

d3.name = "Lemon-Lime";
d3.cost = 0.75;
d3.number = 20;

d4.name = "Grape Soda";
d4.cost = 0.85;
d4.number =20;

d5.name = "Water";
d5.cost = 0.90;
d5.number = 20;

// Initialize the array of structure with above drink structures
Drink drinkArray[5] = {d1,d2,d3,d4,d5};

// Local Variables
double total_amount_earned = 0;
int choice = menu();

// Iterate while loop till choice is not 6
while(choice!=6)
{
// Get the number of available drinks for selected drink
int number_of_drink_available = drinkArray[choice-1].number;

// If it's 0, display message
if(number_of_drink_available==0)
{
cout<<"Sorry. This drink is sold out.\n"<<endl;
}
// Else,
else
{
// Get the cost of selected drink
double drink_cost = drinkArray[choice-1].cost;

// Ask user to enter amount
double amount;
cout<<"Please enter the amount you want to insert:";
cin>>amount;

// If entered amount is not between 0-1
// and if it's less than cost of drink
// Ask user to enter the amount again
while(amount<0 || amount>1 || amount<drink_cost)
{
cout<<"Please enter an amount between $0.00 and $1.00.\n"
"It should also be equal to or greater than the drink price :";
cin>>amount;
}

// Add drink_cost to total_amount_earned
// Decrement number of drinks by 1
// Calculate change
// Display change
total_amount_earned+=drink_cost;
drinkArray[choice-1].number-=1;
double change = amount-drink_cost;
cout<<"CHANGE: $"<<fixed<<setprecision(2)<<change<<"\n"<<endl;
}
// Call menu again
choice = menu();
}

// Print total amount earned by machine
cout<<"SOFT DRINK MACHINE REPORT\n--------------------------"<<endl;
cout<<"Total amount earned: $"<<fixed<<setprecision(2)<<total_amount_earned<<endl;
return 0;
}

OUTPUT-