Sams Teach Yourself C++ in 21 Days

Answers 839

D

// Fetch then increment

const SimpleCircle SimpleCircle::operator++ (int)

{

// declare local SimpleCircle and initialize to value of *this

SimpleCircle temp(*this);

++(itsRadius);

return temp;

}

5. The following is one possible answer:
   class SimpleCircle
   {
   public:
   SimpleCircle();
   SimpleCircle(int);
   ~SimpleCircle();
   void SetRadius(int);
   int GetRadius();
   const SimpleCircle& operator++();
   const SimpleCircle operator++(int);
   private:
   int *itsRadius;
   };

SimpleCircle::SimpleCircle()

{

itsRadius = new int(5);

}

SimpleCircle::SimpleCircle(int radius)

{

itsRadius = new int(radius);

}

const SimpleCircle& SimpleCircle::operator++()

{

++(*itsRadius);

return *this;

}

// Operator ++(int) postfix.

// Fetch then increment

const SimpleCircle SimpleCircle::operator++ (int)

{

// declare local SimpleCircle and initialize to value of *this

➥SimpleCircle temp(*this);

++(*itsRadius);

return temp;

}

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