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  1. #include <iostream>
  2.  
  3. class Drawable
  4. {
  5. public:
  6.     int x;
  7.     int y;
  8. 	Drawable()
  9. 	{
  10. 		x = 0;
  11. 		y = 0;
  12. 	}
  13. };
  14.  
  15. class Ball : public Drawable
  16. {
  17. public:
  18. 	int xdir;
  19. 	int ydir;
  20. 	Ball()
  21. 	{
  22. 		xdir = 1;
  23. 		ydir = 1;
  24. 	}
  25. 	void move();
  26. };
  27.  
  28. void Ball::move()
  29. {
  30. 	x += xdir;
  31. 	y += ydir;
  32. }
  33.  
  34. class Game
  35. {
  36. public:
  37. 	Drawable* drawables;
  38. 	Game() {}
  39. };
  40.  
  41. class Pong : public Game
  42. {
  43. public:
  44. 	Ball ball;
  45. 	Pong()
  46. 	{
  47. 		drawables = new Drawable[1];
  48. 		drawables[0] = ball;
  49. 	}
  50. };
  51.  
  52. int main()
  53. {
  54. 	Pong pongGame;
  55.  
  56. 	std::cout << pongGame.drawables[0].x << std::endl;
  57. 	std::cout << pongGame.ball.x << std::endl;
  58.  
  59. 	pongGame.ball.move();
  60.  
  61. 	std::cout << pongGame.drawables[0].x << std::endl;
  62. 	std::cout << pongGame.ball.x << std::endl;
  63.  
  64. 	return 0;
  65. }
Success #stdin #stdout 0s 3428KB
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https://ideone.com/uU2Z3x
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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