神马品牌网网上法院起诉:关于c++程序设计
来源：百度文库 编辑：神马品牌网 时间：2024/05/09 09:43:57
是一个矩形的面积，不是两个的面积。是根据坐标算的。
#include<iostream.h>
struct point
{
float x,y;
};
class Rectangle
{
private:
float length,width;
point p1,p2;
float area;
public:
Rectangle()
{
cout << "please input the point 1 (x,y):";
cin >> p1.x >> p1.y;
cout << "please input the point 2 (x,y):";
cin >> p2.x >> p2.y;
length = p2.x -p1.x;
width = p2.y - p1.y;
area=length*width;
}
void Display()
{
cout << endl;
cout << "area:" << area << endl;
}
};
void main()
{
Rectangle obj;
obj.Display();
}
#include<iostream.h>
class Rectangle;
class Circle
{
private:
float radius;
float area;
public:
Circle(float x)
{
radius=x;
area=3.14*radius*radius;
}
friend double area_add(Circle Cobj1,Rectangle Robj1);
};
class Rectangle
{
private:
float length,width;
float area;
public:
Rectangle(float l,float w)
{
length=l;
width=w;
area=length*width;
}
friend double area_add(Circle Cobj1,Rectangle Robj1);
};
double area_add(Circle Cobj1,Rectangle Robj1)
{
return Cobj1.area+Robj1.area;
}
void main()
{
Circle obj1(2);
Rectangle obj2(3,3);
cout<<"两个平面图形的面积之和为："<<area_add(obj1,obj2)<<endl;
}