Question

Code the FSM in C++, and show that the program works.

Construct a Finite State Machine that models an old-fashioned soda machine that accepts nickels, dimes, and

quarters. The soda machine accepts change until 35 cents have been put in. It gives change back

for any amount greater than 35 cents. Then the customer can push buttons to receive either a

cola, a root beer, or a ginger ale.

Answer 1

• I have pasted the code and screenshot of successful run below.
• In case of any doubts just comment down.
• The code have following functions.
  acceptMoney() - to keep getting coins until the value is greater than or equal to 35 cents.
  chooseProduct() - to allow customer to choose any given product.
  giveBackChange() - to give the extra money back to customer
  giveProduct() - to give the final product to customer.

-----------------------------Screenshot-----------------------------

-----------------------------Code-----------------------------

#include <iostream>

using namespace std;

string products[] = {"Cola", "Root Beer", "Ginger Ale"};

int acceptMoney(){
   int money = 0;
   while(money<35){
       cout << "Add Money: ";
       int temp; cin >> temp;
       if(temp<0) continue;
       money += temp;
   }
   return money;
}

int chooseProduct(){
   int i = 0;
   cout << i << ". " << products[i++] << endl;
   cout << i << ". " << products[i++] << endl;
   cout << i << ". " << products[i++] << endl;
   int ind = -1;
   while(ind>2 || ind<0){
       cout << "Choose product(0/1/2) : ";
       cin >> ind;
   }
   return ind;
}

void giveBackChange(int money){
   if(money>35){
       cout << "Giving back " << money-35 << "." << endl;
   }
}

void giveProduct(int ind){
   cout << "Giving product: " << products[ind] << endl;
}

int main(){
   while(true){
       cout << endl << "Soda machine is ready!!" << endl;
       int money = acceptMoney();
       int ind = chooseProduct();
       giveBackChange(money);
       giveProduct(ind);
   }
}