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軟件設計師案例分析每日一練試題內容（2022/1/31）

[試題5]

閱讀下列說明和C++代碼，回答下列問題。

[說明]

某咖啡店賣咖啡時，可以根據(jù)顧客的要求在其中加入各種配料，咖啡店會根據(jù)所加入的配料來計算費用?？Х鹊晁目Х燃芭淞系姆N類和價格如表2-8所示。

表2-8 咖啡及配料的種類和價格

[C++代碼]

#include ＜iostream＞

#include ＜string＞

using namespace std;

consr int ESPRESSO_PRICE = 25;

const int DRAKROAST_PRICE = 20;

const int MOCHA_PRICE = 10;

const int WHIP_PRICE = 8;

classBeverage {       //飲料

______: string description;

public: ______() {return description;}

______;};

class CondimentDecorator: public Beverage {           //配料

protected: ______;};

classEspresso: public Beverage {                   //蒸餾咖啡

public:

Espresso ()  {description="Espresso"; }

int cost ()  { return ESPRESSO_PRICE; }

};

class DarkRoast: public Beverage {                    //深度烘培咖啡

public: DarkRoast() { description = "DardRoast"; }

int cost(){ return DRAKROAST_PRICE; }

};

class Mocha: public CondimentDecorator { //摩卡

public: Mocha (Beverage*beverage) { this-＞beverage=beverage;}

string getDescription(){ return beverage-＞getDescription()+",Mocha";}

int cost(){ return MOCHA_PRICE+beverage-＞cost();}

};

class Whip: public CondimentDecorator {                //奶泡

public: Whip (Beverage*beverage) { this-＞beverage=beverage;}

string getDescription() { return beverage-＞getDescription()+",Whip";}

int cost(){ return WHIP_PRICE+beverage-＞cost();}

int main(){

Beverage* beverage = new DarkRoast() ;

beverage=new Mocha(______) ;

beverage=new Whip (______) ;

cout＜＜beverage-＞getDescription()＜＜"￥"＜＜beverage-＞cost()end1;

return 0;

}

編譯運行上述程序，其輸出結果為：DarkRoast，Mocha，Whip ￥38。