graph.cc

来自「做为SD0609的一员,我扎实的基础是如何打出来的,来看看我那时连猴子选大王都不」· CC 代码 · 共 96 行

#include <iostream>
using namespace std;

class Graph{
protected:
	int x;
	int y;
public:
	Graph(int x=0, int y=0)
	:x(x),y(y)
	{}
	virtual void input();
	virtual void draw()=0;
	virtual ~Graph(){}
};
void Graph::input()
{
	cout << "input x and y:";
	cin >> x >> y;
}
class Line : public Graph{
protected:
	int endx;
	int endy;
public:
	Line( int a=0, int b=0, int c=0, int d=0 )
	:Graph(a,b),endx(c),endy(d)
	{}
	virtual void input();
	virtual void draw();
	virtual ~Line(){}
};
void Line::input()
{
	cout << "Line, ";
	Graph::input();
	cout << "input x and y of endpoint:";
	cin >> endx >> endy;
}
void Line::draw()
{
	cout << "Line:(" << x << ',' << y << ")-(" << endx << ',' << endy << ')' << endl;
}
class Circle : public Graph{
protected:
	int r;
public:
	Circle(int a=0, int b=0, int c=0)
	:Graph(a,b),r(c)
	{}
	void input();
	void draw();
	~Circle(){}
};
void Circle::input()
{
	cout << "Circle, ";
	Graph::input();
	cout << "input radius:";
	cin >> r;
}
void Circle::draw()
{
	cout << "Circle:(" << x << ',' << y << ")*" << r << endl;
}
int main(int argc, char* argv[])
{
	Line ol;
	Circle oc;
	Graph* p=NULL;
	p = &ol;
	p->input();
	p->draw();
	p = &oc;
	p->input();
	p->draw();
	for(;;)
	{
		cout << "(1)Line\t(2)Circle" <<endl;
		cout << "choose 1 or 2:";
		int choice;
		cin >> choice;
		if( choice==1 )
			p = new Line;
		else if( choice==2 )
			p = new Circle;
		else
			return 0;
		p->input();
		p->draw();
		delete p;
	}
	return 0;
}