#include<iostream.h>
class line
{
	double k,b;
	friend class process;
public:
	line(double kk,double bb)
	{
		k=kk;
		b=bb;
	}
	void print()
	{
		cout<<"y=("<<k<<")*x+("<<b<<")"<<endl;
	}
};
struct point
{
	double x;
	double y;
};
class process
{
    point point1;
public:
	point setpoint(line& p,line& q)
	{
		point1.x=(q.b-p.b)/(p.k-q.k);
		point1.y=(p.k*q.b-q.k*p.b)/(p.k-q.k);
		return point1;
	}
	void disp(point &s)
	{
		cout<<"兩直線交點為：("<<s.x<<","<<s.y<<")."<<endl;
	}
	point getpoint(){return point1;}
};

void main()
{
	double slope1,slope2,section1,section2;
	cout<<"請輸入第一條直線的斜率：";
	cin>>slope1;
    cout<<"請輸入第一條直線的截距：";
    cin>>section1;
	cout<<"請輸入第二條直線的斜率：";
	cin>>slope2;
    cout<<"請輸入第二條直線的截距：";
	cin>>section2;
    line line1(slope1,section1),line2(slope2,section2);
	cout<<"直線方程為："<<endl;
	line1.print();
	line2.print();
	process p1,p2;
	p1.setpoint(line1,line2);
	p2.disp(p1.getpoint());
}