摘要：对于【程序员】软考考试而言，试题无疑是最重要的学习资料之一。在软考备考过程中，吃透试题、掌握试题所考知识点、熟悉试题的出题思路，对我们提升分数的效果是最明显的，通过对试题的反复练习，还可以查漏补缺。今天，给大家带来【2021年5月程序员模拟题下午（二）】部分试题的详解，一起来看看吧~



1、试题五（15分）阅读下列说明和C++代码，回答问题，将答案填入相应横线处。【说明】某实验室欲建立一个实验室环境监测系统，能够显示实验室的温度、湿度以及洁净度等环境数据。当获取到最新的环境测量数据时，显示的环境数据能够更新现在采用观察者(observer)模式来开发该系统，观察者模式的类图如下图所示。【C++代码】#include <iostream>#include <vector>using namespace std;class Observer {public:    virtual void update(float temp, float humidity, float cleanness)=0;};class Subject {public:    virtual void registerObserver(Observer* o) = 0; //注册对主题感兴趣的观察者    virtual void removeObserver(Observer* o) = 0; //删除观察者       （1）   ;//当主题发生变化时通知观察者};class EnvironmentData : public Subject {private:vector<Observer*> observers;float temperature, humidity, cleanness;public:    void registerObserver(Observer* o) { observers.push_back(o); }    void removeObserver(Observer* o) { /* 代码省略 */ }    void notifyObservers() {for(vector<Observer*>::const_iterator it = observers.begin();            it != observers.end(); it++){(*it)->update(temperature,humidity,cleanness); }}Void measurementsChanged() {notifyObservers(); }void setMeasurements(float temperature, float humidity, float cleanness) {   （2）this->temperature = temperature;   （3） this->humidity = humidity;   （4） this->cleanness = cleanness;    measurementsChanged();    }};class CurrentConditionsDisplay : public Observer() {private:      float temperature, humidity, cleanness;    Subject* envData;public:    CurrentConditionsDisplay(Subject* envData) {        this->envData = envData;           （5）   ;       }void update(float temperature, float humidity, float cleanness)  {this->temperature = temperature;    this->humidity = humidity;    this->cleanness = cleanness;    display();}void display() { /* 代码省略 */ }};int main() {    EnvironmentData* envData = new EnvironmentData();    CurrentConditionsDisplay* currentDisplay = new CurrentConditionsDisplay(envData);    envData->setMeasurements(80, 65, 30.4f);    return 0;}
答案:

（1）virtual void notifyObservers() = 0

（2）this->temperature = temperature

（3）this->humidity = humidity

（4）this->cleanness = cleanness

（5）this->envData->registerObserver(this)

答题解析:无

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