vect.h

我学习C++ Primer Plus过程中写下的课后作业的编程代码

// vect.h -- Vector class with <<, mode state
#ifndef VECTOR_H_
#define VECTOR_H_
#include <iostream>
namespace VECTOR
{
	class Vector
	{
	private:
		double x;		// horizontal value
		double y;		// vertical value
		double mag;		//length of vector
		double ang;		// direction of vector
		char mode;		// 'r' = rectangular, 'p' = polar
		// private methods for setting values
		void set_mag();
		void set_ang();
		void set_x();
		void set_y();
	public:
		Vector();
		Vector( double n1, double n2, char form = 'r' );
		void set( double n1, double n2, char form = 'r' );
		~Vector();
		double xval()const { return x; }	// report x value
		double yval()const { return y; }	// report y value
		double magval()const { return mag; }	// report magnitude
		double angval()const { return ang; }	// report angle
		void polar_mode();		// set mode to 'p'
		void rect_mode();		// set mode to 'r'
		// operator overloading
		Vector operator + ( const Vector & b )const;
		Vector operator - ( const Vector & b )const;
		Vector operator - ()const;
		Vector operator * ( double n )const;
		// friends
		friend Vector operator * ( double n, const Vector & a );
		friend std::ostream & operator << ( std::ostream & os, const Vector & v );
	};
}// end namespace VECTOR
#endif