Question
Give the definitions for the member function add_value, the copy constructor,
the overloaded assignment operator, and the destructor for the
following class. This class is intended to be a class for a partially filled
array. The member variable number_used contains the number of array
positions currently filled. The other constructor definition is given to help
you get started.
#include <cstdlib>
using namespace std;
class PartFilledArray
{
public:
PartFilledArray(int array_size);
PartFilledArray(const PartFilledArray& object);
~PartFilledArray();
void operator = (const PartFilledArray& right_side);
void add_value(double new_entry);
//There would probably be more member functions
//but they are irrelevant to this exercise.
protected:
double *a;
int max_number;
int number_used;
};
PartFilledArray::PartFilledArray(int array_size)
: max_number(array_size), number_used(0)
{
a = new double[max_number];
}
Answer
void PartFilledArray::add_value(double new_entry)
{
if (number_used == max_number)
{
cout << "Adding to a full array.\n";
exit(1);
}
else
{
a[number_used] = new_entry;
number_used++;
}
}
PartFilledArray::PartFilledArray
(const PartFilledArray& object)
: max_number(object.max_number),
number_used(object.number_used)
{
a = new double[max_number];
for (int i = 0; i < number_used; i++)
a[i] = object.a[i];
}
void PartFilledArray::operator =
(const PartFilledArray& right_side)
{
if (right_side.max_number > max_number)
{
delete [] a;
max_number = right_side.max_number;
a = new double[max_number];
}
number_used = right_side.number_used;
for (int i = 0; i < number_used; i++)
a[i] = right_side.a[i];
}
PartFilledArray::~PartFilledArray()
{
deletet[] a;
}