#include #include class Item { public: enum class ItemClass { Weapon, Armor, Potion }; public: Item(std::string name, ItemClass itemClass, int maxAmount, int value) :mName(name), mClass(itemClass), mMaxAmount(maxAmount), mValue(value) {} void examine() const { std::string itemClassOutput = classToString(); std::cout << "Examining an item: " << std::endl << "Item's name: " << mName << std::endl << "Item's class: " << itemClassOutput << std::endl << "You can own " << mMaxAmount << " of this " << itemClassOutput << std::endl << "Buy value: " << mValue << " Sell value: " << mValue / 2 << std::endl; } std::string classToString() const { std::string output; switch(mClass) { case ItemClass::Weapon: output = "Weapon"; break; case ItemClass::Armor: output = "Armor"; break; case ItemClass::Potion: output = "Potion"; break; } return output; } std::string getName() const { return mName; } ItemClass getClass() const { return mClass; } int getMax() const { return mMaxAmount; } int getValue() const { return mValue; } private: std::string mName; ItemClass mClass; int mMaxAmount; int mValue; }; class Inventory { public: void showInventory() const { int x = 1; for(const auto &i: mInventory) { std::cout << x++ << " " << i.getName() << std::endl; } } int addItem(const Item &item, int amount = 1) { int i = 0; for(; i < amount; ++i) { if(canAddItem(item)) { mInventory.push_back(item); } else { break; } } //Returns items that were successfully added return i; } bool canAddItem(const Item &item) const { int maxAllowed = item.getMax(); for(const auto &i: mInventory) { if(i.getName() == item.getName()) { if(--maxAllowed == 0) return false; } } return maxAllowed ? true : false; } int getNumberOfItemsOwned(const Item &item) const { int retV = 0; for(const auto &i: mInventory) { if(i.getName() == item.getName()) { ++retV; } } return retV; } bool removeItem(const Item &item) { int x = 0; for(const auto &i: mInventory) { if(i.getName() == item.getName()) { mInventory.erase(mInventory.begin()+x); return true; } ++x; } return false; } bool hasItemInInventory(const Item &item) const { for(const auto &i : mInventory) { if(i.getName() == item.getName()) { return true; } } return false; } private: std::vector mInventory; }; class Player : public Inventory { public: Player(int startingGold) :mGold(startingGold) {} int getGold() const { return mGold; } void addGold(int amount) { mGold += amount; } private: int mGold; }; class ItemShop : public Inventory { public: void buyItem(Player &p, const Item &item, int amountToBuy = 1) { if(!hasItemInInventory(item)) //Same as this->hasItemInInventory(item) { std::cout << "This shop does not sell a " << item.getName() << std::endl; } else if(p.canAddItem(item)) { int itemsAlreadyOwned = p.getNumberOfItemsOwned(item); for(int i = 0; i < amountToBuy && itemsAlreadyOwned < item.getMax(); ++i) { if(hasItemInInventory(item)) { if(p.getGold() >= item.getValue()) { p.addGold(-item.getValue()); p.addItem(item); ++itemsAlreadyOwned; removeItem(item); } else { std::cout << "You do not have enough money to buy a " << item.getName() << std::endl; break; } } else { std::cout << "This shop ran out of " << item.getName() << "'s." << std::endl; break; } } } else { std::cout << "You already own the max amount of " << item.getName() << "!" << std::endl; } } void sellItem(Player &p, const Item &item, int amountToSell = 1) { for(int i = 0; i < amountToSell; ++i) { if(p.removeItem(item)) { p.addGold(item.getValue() / 2); addItem(item); } } } }; std::vector setupItems() { std::vector items; items.push_back(Item("Wooden Sword", Item::ItemClass::Weapon, 1, 200)); items.push_back(Item("Wooden Shield", Item::ItemClass::Armor, 1, 250)); items.push_back(Item("Healing Potion", Item::ItemClass::Potion, 99, 30)); items.push_back(Item("Legendary Sword", Item::ItemClass::Weapon, 1, 10000)); return items; } ItemShop setupBasicShop(const std::vector &inGameItems) { ItemShop shop; shop.addItem(inGameItems[0]); shop.addItem(inGameItems[1]); shop.addItem(inGameItems[2], 4); return shop; } void doShopping(Player &p, ItemShop &shop, const std::vector &inGameItems) { //Buy 1 wooden shield shop.buyItem(p, inGameItems[1]); //Buy 3 healing potions shop.buyItem(p, inGameItems[2], 3); //Sell 1 healing potion shop.sellItem(p, inGameItems[2]); //Attempt to buy a legendary sword, but this shop does not sell it. shop.buyItem(p, inGameItems[3]); } int main() { //Player holding $666 Player player(666); //Setup the items that are ingame const std::vector inGameItems = setupItems(); //Create a shop with basic items ItemShop itemShop = setupBasicShop(inGameItems); //Give the player a free sword player.addItem(inGameItems[0]); //Display Player's inventory std::cout << "Player's inventory before shopping: " << std::endl; player.showInventory(); //Display item Shop's inventory std::cout << std::endl << "Item shop's inventory before shopping: " << std::endl; itemShop.showInventory(); std::cout << std::endl; doShopping(player, itemShop, inGameItems); std::cout << std::endl << "Player's inventory after shopping: " << std::endl; player.showInventory(); std::cout << std::endl << "Player's remaining gold: " << player.getGold() << std::endl; std::cout << std::endl << "Item shop's inventory after shopping: " << std::endl; itemShop.showInventory(); std::cout << std::endl; inGameItems[3].examine(); }

Item Shop example