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| #include<iostream>
using namespace std;
class Control{
public:
virtual ~Control() = default;
virtual void start()=0;
virtual void close()=0;
};
class Screen: public Control{
public:
void start(){
cout<<"the screen start!"<<endl;
}
void close(){
cout<<"the screen close!"<<endl;
}
};
class Keyboard: public Control{
public:
void start(){
cout<<"the Keyboard start!"<<endl;
}
void close(){
cout<<"the Keyboard close!"<<endl;
}
};
class Host: public Control{
public:
void start(){
cout<<"the Keyboard start!"<<endl;
}
void close(){
cout<<"the Keyboard close!"<<endl;
}
};
class Computer{
private:
Host host;
Keyboard keyboard;
Screen screen;
public:
void start(){
host.start();
keyboard.start();
screen.start();
}
void close(){
host.close();
keyboard.close();
screen.close();
}
};
int main(){
Computer computer;
computer.start();
computer.close();
}
|
