用c++编写由圆和高多重继承派生出圆锥类,在主函数中能够实现圆锥体积和表面积的计算

#include
#include
#define N 3.1415
using namespace std;
class Height
{
private:
float h;
public:
Height(float h):h(h)
{}
float getheight()
{
return h;
}
};
class Circle
{
private:
float radius;
public:
Circle(float r):radius(r)
{}
float getradius();
float area();
};
float Circle::getradius()
{
return radius;
}
float Circle::area()
{
return N*radius*radius;
}
class cone:public Height,public Circle
{
private:
float line;
public:
cone(float h,float r):Height(h),Circle(r)
{}
void getline();
float surarea();
float volume();
void show();
};
void cone::getline()
{
float a=getradius();
float b=getheight();
line=sqrt(a*a+b*b);
}
float cone::surarea()
{
return area()+N*getradius()*line;
}
float cone::volume()
{
return area()*getheight()/3;
}
void cone::show()
{
cout