Odd Anoying Runtime error

    
class VECTOR3D
	{
	public:
		float v[3];

	const VECTOR3D operator=  (const VECTOR3D&	vec);
	const VECTOR3D operator+  (const VECTOR3D&	vec);
	const VECTOR3D operator+  (void);
	const VECTOR3D operator+= (const VECTOR3D&	vec);
	const VECTOR3D operator-  (const VECTOR3D&	vec);
	const VECTOR3D operator-  (void);
	const VECTOR3D operator-= (const float&	vec);
	const VECTOR3D operator*= (const float&	s);
	const VECTOR3D operator/= (const float&	s);
	const VECTOR3D operator*  (const float&   s);
	const VECTOR3D operator*  (const VECTOR3D&  vec);
	const VECTOR3D operator/  (float s);
	const bool	   operator== (const VECTOR3D&  vec);
	const bool     operator!= (const VECTOR3D&  vec);

	const float DotProduct(const VECTOR3D &vec);
	const float Length(void);
	const float SquaredDistance(VECTOR3D &vec);
	const VECTOR3D CrossProduct(const VECTOR3D& vec);
	const VECTOR3D Unit(void);
	void Normalize(void);
	void SendToOGL(void);
	void SetProperties(float x, float y, float z);

	VECTOR3D(void)
		{	memset(v[0], 0, sizeof(float[3]));	}
	VECTOR3D(float x, float y, float z);

	~VECTOR3D(void)
		{	}
	};
  

I keeps telling when I run the program that an error has occured in my program. I hit the debug option and it points me a part of the definition of the void SetProperties(float x, float y, float z);

      
void VECTOR3D::
	SetProperties(float x, float y, float z)
	{
		v[0]= x;
		v[1]= y;  //<------POINTS RIGHT HERE

		v[2]= z;
	}