cylinder.cpp

来自「谭浩强C程序设计习题答案」· C++ 代码 · 共 21 行

//习题12.1中的cylinder.cpp文件
//CYLINDER.CPP
Cylinder::Cylinder(float a,float b,float r,float h)
    :Circle(a,b,r),height(h){}

void Cylinder::setHeight(float h){height=h;}

float Cylinder::getHeight() const {return height;}

float Cylinder::area() const
{ return 2*Circle::area()+2*3.14159*radius*height;}

float Cylinder::volume() const
{return Circle::area()*height;}

ostream &operator<<(ostream &output,const Cylinder& cy)
{output<<"Center=["<<cy.x<<","<<cy.y<<"], r="<<cy.radius<<", h="<<cy.height
       <<"\narea="<<cy.area()<<", volume="<<cy.volume()<<endl;
 return output;
}