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| #include<iostream>
#include<iomanip>
using namespace std;
class Point
{
friend ostream& operator<<(ostream& output, const Point& p);
protected:
double x;
double y;
public:
Point(double d1 = 0.0, double d2 = 0.0) :x(d1), y(d2) {}
void setPoint(double d1, double d2)
{
x = d1, y = d2;
return;
}
double getX()const { return x; }
double getY()const { return y; }
};
class Circle :public Point
{
friend ostream& operator<<(ostream& output, const Circle& c);
protected:
double radius;
public:
Circle(double r = 0.0, double d1 = 0.0, double d2 = 0.0):radius(r),Point(d1,d2) {}
void setRadius(double r)
{
radius = (r > 0 ? r : 0);
return;
}
double getRadius()const { return radius; }
double area()const
{
return acos(-1) * radius * radius;
}
};
class Cylinder :public Circle
{
friend ostream& operator<<(ostream& output, const Cylinder& c);
protected:
double height;
public:
Cylinder(double h=0.0,double r=0.0,double d1=0.0,double d2=0.0):height(h),Circle(r,d1,d2){}
void setHeight(double h)
{
height = (h > 0 ? h : 0);
return;
}
double getHeight()const { return height; }
double area()const
{
return 2 * Circle::area() + 2 * acos(-1) * radius * height;
}
double volume()const
{
return Circle::area() * height;
}
};
ostream& operator<<(ostream& output, const Point& p)
{
output << "Point: (" << p.x << "," << p.y << ")" << endl << endl;
return output;
}
ostream& operator<<(ostream& output, const Circle& c)
{
output << "Circle:" << endl;
output << "Center: (" << c.x << "," << c.y << ")" << endl;
output << "Radius:" << setiosflags(ios::fixed | ios::showpoint) << setprecision(2) << c.radius << endl;
return output;
}
ostream& operator<<(ostream& output, const Cylinder& c)
{
output << "Cylinder:" << endl;
output << "Center: (" << c.x << "," << c.y << ")" << endl;
output << "Radius:" << setiosflags(ios::fixed | ios::showpoint) << setprecision(2) << c.radius << endl;
output << "Height:" << c.height << endl;
return output;
}
int main()
{
Point p(2.5, 3.5);
cout << "p:" << endl;
cout << p;
p.setPoint(9, 10);
cout << "change Point p:" << endl;
cout << p;
Circle c(8.1, 3.1, 4.1);
cout << "c:" << endl;
cout << c;
cout << "c area:" << c.area() << endl;
cout << endl;
c.setRadius(8);
c.setPoint(1, 2);
cout << "chaneg Circle c:" << endl;
cout << c;
cout << "c area:" << c.area() << endl;
cout << endl;
Cylinder cy(5.5, 2.5, 3.5, 4.5);
cout << "cy:" << endl;
cout << cy;
cout << "cy area:" << cy.area() << endl;
cout << "cy volume:" << cy.area() << endl;
cout << endl;
cy.setHeight(5);
cy.setRadius(2);
cy.setPoint(3, 4);
cout << "chaneg Cylinder cy:" << endl;
cout << cy;
cout << "cy area:" << cy.area() << endl;
cout << "cy volume:" << cy.volume() << endl;
return 0;
}
|
