//// File: VECTOR.h//#ifndef _VECTOR_H_#define _VECTOR_H_// This class VECTOR comes from an article about rigid body // animation published on www.gamasutra.com so it may // follow its own license. Please check gamasutra at // http://www.gamasutra.com/features/19990702/data_structures_01.htm// or just write your own to replace it.// A floating point number//typedef float SCALAR;//// A 3D vector//class VECTOR{public:	SCALAR	x, y, z; //x,y,z coordinatespublic:	VECTOR() : x(0), y(0), z(0) {}	VECTOR( const SCALAR& a, const SCALAR& b, const SCALAR& c ) : x(a), y(b), z(c) {}	//index a component	//NOTE: returning a reference allows	//you to assign the indexed element	SCALAR& operator [] ( const long i );//compare	const bool operator == ( const VECTOR& v ) const;	const bool operator != ( const VECTOR& v ) const;//negate	const VECTOR operator - () const;//assign	const VECTOR& operator = ( const VECTOR& v );//increment	const VECTOR& operator += ( const VECTOR& v );//decrement	const VECTOR& operator -= ( const VECTOR& v );//self-multiply	const VECTOR& operator *= ( const SCALAR& s );//self-divide	const VECTOR& operator /= ( const SCALAR& s );//add	const VECTOR operator + ( const VECTOR& v ) const;//subtract	const VECTOR operator - ( const VECTOR& v ) const;//post-multiply by a scalar	const VECTOR operator * ( const SCALAR& s ) const;//pre-multiply by a scalar	friend inline const VECTOR operator * ( const SCALAR& s, const VECTOR& v )	{		return v * s;	}//divide	const VECTOR operator / (SCALAR s) const;//cross product	const VECTOR cross( const VECTOR& v ) const;//scalar dot product	const SCALAR dot( const VECTOR& v ) const;//length	const SCALAR length() const;//unit vector	const VECTOR unit() const;//make this a unit vector	void normalize();//equal within an error e	const bool nearlyEquals( const VECTOR& v, const SCALAR e ) const;};#endif	//_VECTOR_H_