Solved

classes

Posted on 1998-10-15
2
204 Views
Last Modified: 2010-04-02
Lets say I have two classes.
the first class flowers has some functions for the flowers.
To tell if they are dead or alive.
the second class has flowers** ptr in private.
the second class needs to get a flower tell if its
dead or alive and if that flower has already been accessed.
PLEASE HELP..

0
Comment
Question by:strmtrpr
2 Comments
 

Accepted Solution

by:
MostlyWater earned 100 total points
ID: 1175289
You have not stated what to do with this **Flower...
So, I guess you will use an "array of pointers".
is this what you want ?
class TFlower
{
 public :
  TFlower(void) //need a std c´tor for a vector
  { Alive = true; AlreadyAcessed=false; }

  bool isAlive(void) const
  { AlreadyAcessed=true; return Alive; }
  bool isDead(void) const { return ! isAlive(); }
  bool hasAlreadyBeenAcessed(void)const{return AlreadyAcessed;}
  //you need to define what "access" means :
  //  ->asking if dead or not == accessed
  //  ->killing a flower is an access
  //might add this (for the second meaning)
  void kill(void)
  { Alive=false;
    AlreadyAcessed=true; // ?? really ??
                                               //You would not really need "AlreadyAccessed" then
                         //because "Alive" would show if someone
                         //grabbed at the flower.
  }
  //imagine this(probably what you wish to do)
  bool change(whatever parameters)//non-const
  {
   //do your changes here, return true if params are chosen
   //within valid ranges
   AlreadyAcessed=true;
  }

 private :
  bool Alive;
  bool AlreadyAcessed;
};

class TFlowerLst
{
 public :
  TFlowerPtrLst(//well, that depends what you will do with it.
                const int Size);

  killRandom(const int HowMany=1);
  int countAlive(void)const;//returns no of alive flowers
 private :
  TFlower **FlowerPtrs;
  int Size;
}
TFlowerLst::TFlowerLst(const int Size)
{
 FlowerPtrs = new (TFlower *)[Size];
 for(int i=0;i<Size;++i)
 {
  FlowerPtrs[i] = new TFlower();//or whatever c´tor you will define
 }
}
TFlowerLst::countAlive(void) const
{
 int RetVal=0;
 for(int i=0;i<Size;++i)
 {
  if( FlowerPtrs[i] )
  { if( FlowerPtrs[i]->isAlive() )
    { ++RetVal; }
  }
 }
 return RetVal;
}
bool TFlowerLst::killRandom(const int HowMany/*=1*/)
{
 if( countAlive() < HowMany ) return false;//will hang otherwise
 //need to include stdlib.h for random()
 bool KilledOne=false;
 int  Index;
 for(int i=0;i<HowMany;++i)
 {
  while( ! KilledOne )
  { Index = random(Size);
    if( FlowerPtrs[i]->isAlive() )
    { FlowerPtrs[i]->kill();
      KilledOne=true;
    }
  }
 }
 return true;
}

Hope that helps
0
 

Author Comment

by:strmtrpr
ID: 1175290
Thanks
0

Featured Post

3 Use Cases for Connected Systems

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In days of old, returning something by value from a function in C++ was necessarily avoided because it would, invariably, involve one or even two copies of the object being created and potentially costly calls to a copy-constructor and destructor. A…
Introduction This article is a continuation of the C/C++ Visual Studio Express debugger series. Part 1 provided a quick start guide in using the debugger. Part 2 focused on additional topics in breakpoints. As your assignments become a little more …
The goal of the tutorial is to teach the user how to use functions in C++. The video will cover how to define functions, how to call functions and how to create functions prototypes. Microsoft Visual C++ 2010 Express will be used as a text editor an…
The viewer will learn how to pass data into a function in C++. This is one step further in using functions. Instead of only printing text onto the console, the function will be able to perform calculations with argumentents given by the user.

778 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question