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本题添加时间：2023/4/3 12:59:00 |
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圆梦客服：王老师 19139051760(微信同号) 19139051760(微信同号) |
[应用题,25分] #include
float const PI=3.14;
class point
{
private:
float x,y,area;
public:
point(float x1=0.0,float y1=0.0)
{
cout<<"point构造函数被调用!\n";
}
virtual ~point()
{
cout<<"point析构函数被调用!\n";}
virtual float getarea(){return 0.0;}
};
class circle:public point
{private:
float r;
public:
circle(float x1,float y1,float Nr):point(x1,y1)
{
r=Nr;
cout<<"circle构造函数被调用!\n ";
}
~circle(){cout<<"circle析构函数被调用!\n";}
float getarea()
{
return PI*r*r;
}
};
void main()
{
point *p,p1(3,4);
p=&p1;
coutcircle c(1,1,1);
p=&c;
cout
}
程序运行结果为：
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答案是:point构造函数被调用! 0 point构造函数被调用!circle构造函数被调用! 3.14 circle析构函数被调用! point析构函数被调用! point析构函数被调用!
出自
许昌学院面向对象程序设计 青书学堂系统
许昌学院
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