quad.h

这是一个利用VC++编写的求解极值的多元的二次方程程序

#ifndef _quad_h

class quadratic
{
	public:
	
	quadratic();
	quadratic(double a, double b, double c);
	quadratic(const quadratic &a);
	
	double get_a();
	double get_b();
	double get_c();

	double discriminant();
	
	int numxintercept();
	
	double xint1();
	double xint2();
	
	double fun_of_x(double x);
	double deriv_of_x(double x);
	
	double xvertex();
	double yvertex();
	
	bool hasmaxvalue();
	bool hasintercepts(quadratic &a);
	
	double xintercept1(const quadratic &a);
	double xintercept2(const quadratic &a);
	double yintercept1(const quadratic &a);
	double yintercept2(const quadratic &a);
	
	string min_or_max();
	
	private:
	
	double myA,myB,myC;
	
};

#define _quad_h
#endif