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Source Code
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#include <iostream>
#include <limits>
class CashRegister {
private:
int cashOnHandCents;
public:
CashRegister() : cashOnHandCents(500) {}
explicit CashRegister(int initialCents) : cashOnHandCents(initialCents) {}
int getCurrentBalance() const {
return cashOnHandCents;
}
void acceptAmount(int amountCents) {
cashOnHandCents += amountCents;
}
};
class Dispenser {
private:
int numberOfItems;
int costCents;
public:
Dispenser() : numberOfItems(50), costCents(50) {}
Dispenser(int costInCents, int itemCount) : numberOfItems(itemCount), costCents(costInCents) {}
int getNoOfItems() const {
return numberOfItems;
}
int getCost() const {
return costCents;
}
bool isInStock() const {
return numberOfItems > 0;
}
void makeSale() {
if (numberOfItems > 0) {
--numberOfItems;
}
}
};
static int readInt(const char* prompt) {
int value = 0;
while (true) {
std::cout << prompt;
if (std::cin >> value) {
return value;
}
std::cout << "Invalid input. Please enter a number.\n";
std::cin.clear();
std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
}
}
static void showMenu() {
std::cout << "*** Welcome to the Candy Shop ***\n"
<< "To select an item, enter:\n"
<< "1 for Candy\n"
<< "2 for Chips\n"
<< "3 for Gum\n"
<< "4 for Cookies\n"
<< "5 to Exit\n";
}
static void dispenseMessage() {
std::cout << "Collect your item at the bottom and enjoy!!\n"
<< "*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*\n\n";
}
static void sellProduct(Dispenser& item, CashRegister& reg) {
const int cost = item.getCost();
std::cout << "Please deposit " << cost << " cents.\n";
int deposited = 0;
while (deposited < cost) {
int add = readInt("Deposit cents: ");
if (add < 0) {
std::cout << "Please deposit a nonnegative amount.\n";
continue;
}
deposited += add;
if (deposited < cost) {
std::cout << "Please deposit another " << (cost - deposited) << " cents.\n";
}
}
item.makeSale();
reg.acceptAmount(deposited);
}
int main() {
CashRegister register1;
Dispenser candy; // default: 50 items, 50 cents
Dispenser chips; // default: 50 items, 50 cents
Dispenser cookies; // default: 50 items, 50 cents
Dispenser gum(10, 50); // 50 items, 10 cents each
int choice = 0;
while (choice != 5) {
showMenu();
choice = readInt("Choice: ");
while (choice < 1 || choice > 5) {
std::cout << "Error, please select a number between 1 and 5.\n";
choice = readInt("Choice: ");
}
switch (choice) {
case 1:
if (candy.isInStock()) {
sellProduct(candy, register1);
dispenseMessage();
} else {
std::cout << "Sorry, this item is sold out.\n\n";
}
break;
case 2:
if (chips.isInStock()) {
sellProduct(chips, register1);
dispenseMessage();
} else {
std::cout << "Sorry, this item is sold out.\n\n";
}
break;
case 3:
if (gum.isInStock()) {
sellProduct(gum, register1);
dispenseMessage();
} else {
std::cout << "Sorry, this item is sold out.\n\n";
}
break;
case 4:
if (cookies.isInStock()) {
sellProduct(cookies, register1);
dispenseMessage();
} else {
std::cout << "Sorry, this item is sold out.\n\n";
}
break;
case 5:
break;
}
}
return 0;
}
Compiling Program...
Standard Input:
Interactive Console
Text
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