11-4.cpp

为初学者提供的最佳的C++程序设计源程序库

#include<iostream.h>
class figure
{
public:
   double height;
   double width;
};
class square:public figure
{
public:
  square(double h,double w);
  void area();
};
class isosceles_triangle:public figure
{
public:
  isosceles_triangle(double h,double w);
  void area();
};
class cylinder:public figure
{
public:
    cylinder(double h,double w);
    void area();
};
square::square(double h,double w)
{
 height=h;
 width=w;
}
isosceles_triangle::isosceles_triangle(double h,double w)
{
  height=h;
  width=w;
}
cylinder::cylinder(double h,double w)
{
  height=h;
  width=w;
}

void square::area()
{
cout<<"The area of square is:"<<width*height<<"\n";
}
void isosceles_triangle::area()
{cout<<"The area of isosceles_tringle is:"
     <<0.5*width*height<<"\n";
}
void cylinder::area()
{
   cout<<"The surface_area of cylinder is:"
       <<(2*3.1416*(width/2)*(width/2))+(3.1416*width*height)<<"\n";
}
main()
{
 square s(10.0,6.0);
 isosceles_triangle i(8.0,6.0);
 cylinder c(5.0,4.0);
 s.area();
 i.area();
 c.area();
 return 0;
}