// STYC++ in 21 Chapter 14 prog 1
//
//  Example of a static data member of a class
//
//

#include <iostream.h>

class Cat
{
	public:
	Cat(int age): itsAge(age) { howManyCats++; }
	virtual ~Cat() { howManyCats--; }
	virtual int getAge() { return itsAge; }
	virtual void setAge(int age) { itsAge = age; }
	static int howManyCats;

    private:
	int itsAge;
};

int Cat::howManyCats = 0;

int main()
{

   const int maxCats = 5; int i;
   Cat* catHouse[maxCats];

	for (i=0; i<maxCats; i++)
      catHouse[i] = new Cat(i);

	for (i=0; i<maxCats; i++)
      {
	     cout << "There are " << Cat::howManyCats << " cats left!!\n";
		 cout << "Deleting the one which is " << catHouse[i]->getAge();
		 cout << " years old\n";
		 delete catHouse[i];
		 catHouse[i] = 0;
	  }

    return 0;

} // eos

// STYC++ in 21 Chapter 14 prog 2
//
//  Accessing static data mebers w/o a class
//
//

#include <iostream.h>

class Cat
{
	public:
	Cat(int age): itsAge(age) { howManyCats++; }
	virtual ~Cat() { howManyCats--; }
	virtual int getAge() { return itsAge; }
	virtual void setAge(int age) { itsAge = age; }
	static int howManyCats;

    private:
	int itsAge;
};

int Cat::howManyCats = 0;

void telepathicFunction();

int main()
{

   const int maxCats = 5; int i;
   Cat* catHouse[maxCats];

	for (i=0; i<maxCats; i++)
	{
		catHouse[i] = new Cat(i);
		telepathicFunction();
    }


	for (i=0; i<maxCats; i++)
      {
	    delete catHouse[i]; 
		telepathicFunction();
	  }

    return 0;

} // end of main

void telepathicFunction()
{
	cout << "There are " << Cat::howManyCats << " alive!\n";
}

// STYC++ in 21 Chapter 14 prog 3
//
//   Accessing static data w/ non static member funcs  
//
//

#include <iostream.h>

class Cat
{
	public:
	Cat(int age): itsAge(age) { howManyCats++; }
	virtual ~Cat() { howManyCats--; }
	virtual int getAge() { return itsAge; }
	virtual void setAge(int age) { itsAge = age; }
    virtual int getHowMany() { return howManyCats; }


    private:
	int itsAge;
	static int howManyCats;
};

int Cat::howManyCats = 0;


int main()
{

   const int maxCats = 5; int i;
   Cat* catHouse[maxCats];

	for (i=0; i<maxCats; i++)
		catHouse[i] = new Cat(i);
		
	for (i=0; i<maxCats; i++)
      {
	    cout << "There are " << catHouse[i]->getHowMany() << " cats left!!\n";
		cout << "Deleting the one which is " << catHouse[i]->getAge()+2;
		cout << " years old\n";
		delete catHouse[i];
		catHouse[i] = 0;
	  }

    return 0;

} // end of main & source

// STYC++ in 21 Chapter 14 prog 4
//
//  Accessing static data mebers w/ a static member function
//
//

#include <iostream.h>

class Cat
{
	public:
	Cat(int age): itsAge(age) { howManyCats++; }
	virtual ~Cat() { howManyCats--; }
	virtual int getAge() { return itsAge; }
	virtual void setAge(int age) { itsAge = age; }
    static int getHowMany() { return howManyCats; }


    private:
	int itsAge;
	static int howManyCats;
};

int Cat::howManyCats = 0;

void telepathicFunction();

int main()
{

   const int maxCats = 5; int i;
   Cat* catHouse[maxCats];

	for (i=0; i<maxCats; i++)
	{
		catHouse[i] = new Cat(i);
		telepathicFunction();
    }


	for (i=0; i<maxCats; i++)
      {
	    delete catHouse[i]; 
		telepathicFunction();
	  }

    return 0;

} // end of main

void telepathicFunction()
{
	cout << "There are " << Cat::getHowMany() << " alive!\n";
}

// STYC++ in 21  Chapter 14 prog 5
//
//  An example of pointers to functions
//
//

#include <iostream.h>

void square(int&, int&);
void cube(int&, int&);
void swap(int&, int&);
void getVals(int&, int&);
void printVals(int, int);

int main()
{

  void (* pFunc) (int &, int &);
  bool fQuit = false;

  int valOne = 1, valTwo = 2;
  int choice;
  while (fQuit == false) 
   {
    
	  cout << "(0) Quit (1) Change Vals (2) Square (3) Cube (4) Swap\n";
	  cin >> choice;

	  switch(choice)
        {
		   case 1 : pFunc = getVals; break;
	       case 2 : pFunc = square; break;
		   case 3 : pFunc = cube; break;
		   case 4 : pFunc = swap; break;
		   default : fQuit = true; break;
        } // end of switch

		if (fQuit) break;

		printVals(valOne, valTwo);
		pFunc(valOne, valTwo);
        printVals(valOne, valTwo);

    }  // end of while

	return 0;

} // end of main

void printVals( int v1, int v2)
{
   cout << "The value of X : " << v1 << " and Y : " << v2 << endl;
}

void square( int& v1 , int& v2)
{
   v1 *= v1;
   v2 *= v2;
}

void cube(int &v1,int& v2)
{
   v1 = (v1*v1*v1);
   v2 = (v2*v2*v2);
}

void swap(int& v1, int& v2)
{
   int temp;
   temp = v1;
   v1 = v2;
   v2 = temp;
}

void getVals( int& v1, int& v2)
{
   cout << "Enter a new value for X : ";
   cin >> v1;
   cout << "Enter a new value for Y : ";
   cin >> v2;
}

// end of source