class vector2{

	float x;

	float y;


	constructor( float x, float y ) {

		//printf("constructor has been called.. x: %i, y: %i \n", x, y);

		this->x = x;

		this->y = y;

		// this causes an infinity loop.
		// vector2 a = new vector2( 0, 0 );

		//   this->add( &a );

	}



	vector2 * operator+( vector2 * b ){

		this->add( b );

		return this;

	}

	vector2 * operator+=( struct vector2 * b ) {

		// not proper
		//strcat( this, b );

		//printf("operator += triggered");

		return b;
	}
	
	add( vector2 * a ) {

		this->x += a->x;

		this->y += a->y;

	}

	subtract( vector2 * a ) {

		this->x -= a->x;

		this->y -= a->y;

	}

	int length() {

		return this->x + this->y;

	}

}