class DrinksMachineC implements DrinksMachine
{
// A drinks machine with a count on the number of cans left

 private int balance,price;
 private int cokes,fantas;

 public DrinksMachineC(int p)
 {
  price=p;
  cokes=0;
  fantas=0;
 }

 public void addMoney(int pence)
 // Simulates putting a coin in the slot of the machine
 {
  balance+=pence;
 }

 public int showMoney()
 // Simulates the display of the amount put in so far
 {
  return balance;
 }

 public int showPrice()
 // Simulates the display of the current price of a can.
 // Assumes all drinks are the same price.
 {
  return price;
 }

 public String pressCoke()
 // Simulates pressing the button to deliver a can of Coke
 // Returns "Coke" normally, but "Nothing" if there are no Coke cans
 // left or not enough money has been entered
 {
  if(cokes==0||balance<price)
     return "Nothing";
  else
     {
      cokes--;
      balance-=price;
      return "Coke";
     }
 }

 public String pressFanta()
 // Simulates pressing the button to deliver a can of Fanta
 // Returns "Fanta" normally, but "Nothing" if there are no Fanta cans
 // left or not enough money has been entered
 {
  if(fantas==0||balance<price)
     return "Nothing";
  else
     {
      fantas--;
      balance-=price;
      return "Fanta";
     }
 }

 public String pressChange()
 // Simulates pressing the button to return any money that has been
 // put in and not spent. 
 // Assumes an unlimited supply of change is available
 {
  int change=balance;
  balance=0;
  return change+"p";
 }

 public void changePrice(int newprice)
 // Simulates changing the price of a can. Assumes all drinks are the same 
 // price.
 {
  price=newprice;
 }

 public void loadFantas(int num)
 // Simulates loading the machine with more cans of Fanta
 {
  fantas+=num;
 }

 public void loadCokes(int num)
 // Simulates loading the machine with more cans of Coke
 {
  cokes+=num;
 }

}