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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4.  
  5. class Run;
  6.  
  7.  
  8. class Robot{
  9.     friend class Run;	// allows the Run class to access all the private data as if it were its own
  10. 	private:
  11. 		int x;
  12. 	public:
  13. 		Robot() {};
  14. 		void setX(int newX)	{ 	x= newX;	}
  15. 		int getX() 			{	return x;	}
  16. 		void movingRobot()	{	x+=1;	}
  17.  
  18. };
  19.  
  20. class Run{
  21. private:
  22. 	vector<Robot*> robots;
  23. public:
  24. 	Run(){};
  25. 	vector<Robot*> *getRobots()	{	return &robots;	}
  26. 	void createRobot()			{ 	robots.push_back(new Robot()); robots.back()->x =1;	}
  27. 	void movAll()				{	for (int i=0;i<robots.size();i++){ robots[i]->movingRobot();}	}
  28. 	int getX(int robotPosition){	return robots[robotPosition]->x;	}  //uses the friend status to read directly from Robot class instances x
  29. 	void setX(int rpos, int xval){	robots[rpos]->setX(xval);	}
  30. };
  31.  
  32.  
  33. int main()
  34. {
  35. 	Run *Sim = new Run();
  36.     for (int i =0; i< 10; i++)
  37.         {
  38.             Sim->createRobot();
  39.             Sim->setX(i,i); // uses the Run setX
  40.             std::cout << "Robot " << i << "(starting position): " << Sim->getRobots()->at(i)->getX() << std::endl;
  41.         }
  42. 	Sim->movAll();
  43.     // lets move Johnny 5 to 55 as well...
  44.    (Sim->getRobots()->at(4))->setX(55); // uses the robot setx
  45.     for (int i=0; i< 10; i++)
  46.     {
  47.         std::cout << "Robot " << i << "(final position): " << Sim->getRobots()->at(i)->getX()<< std::endl;
  48.     }
  49.  
  50.  
  51. 	return 0;
  52. }
Success #stdin #stdout 0s 3472KB
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stdin
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Standard input is empty
stdout
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Robot 0(starting position): 0
Robot 1(starting position): 1
Robot 2(starting position): 2
Robot 3(starting position): 3
Robot 4(starting position): 4
Robot 5(starting position): 5
Robot 6(starting position): 6
Robot 7(starting position): 7
Robot 8(starting position): 8
Robot 9(starting position): 9
Robot 0(final position): 1
Robot 1(final position): 2
Robot 2(final position): 3
Robot 3(final position): 4
Robot 4(final position): 55
Robot 5(final position): 6
Robot 6(final position): 7
Robot 7(final position): 8
Robot 8(final position): 9
Robot 9(final position): 10
https://ideone.com/9rEDvU
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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