各位大神好，我在用類別實作Array時出了一點小狀況
很不幸的在做出陣列的時候，陣列的size完全跟輸入的size 不一樣
以下我的程式碼

#include <iostream>
#include <cstdlib>
class CppArray
{
  public:
	CppArray(int, float);										 // Constructor
	CppArray(const CppArray &);									 // Copy constructor
	CppArray &operator=(const CppArray &);						 // Assigner
	~CppArray();												 // Destructor
	float &operator[](int);										 // Subscript operator
	int getSize(void) const;									 // Sizeof array
	float *getHead() const;										 // Get the pointer of head of the array
	friend std::istream &operator>>(std::istream &, CppArray &); // Overload operator >>
	friend std::ostream &operator<<(std::ostream &, CppArray &); // Overload operator <<
  private:
	int size;
	float initvalue;
	float *head = nullptr;
};
CppArray::CppArray(int size = 1, float initValue = 0.0)
{
	std::cout << "Constructor" << std::endl;
	this->head = new float[size];
	for (int i = 0; i < size; ++i)
	{
		*(head + i) = initValue;
	}
}

CppArray::CppArray(const CppArray &cppArr)
{
	std::cout << "Copy constructor" << std::endl;
	this->size = cppArr.size;
	this->head = new float[this->size];
	for (int i = 0; i < this->size; ++i)
	{
		*(this->head + i) = *(cppArr.head + i);
	}
}
CppArray &CppArray::operator=(const CppArray &cppArr)
{
	std::cout << "operator=" << std::endl;
	delete[](this->head);
	this->size = cppArr.getSize();
	this->head = new float[this->size];
	for (int i = 0; i < this->size; ++i)
	{
		*(this->head + i) = *(cppArr.getHead() + i);
	}
	return *this;
}

CppArray::~CppArray()
{
	std::cout << "destructor" << std::endl;
	delete[] head;
}

float &CppArray::operator[](int x)
{
	std::cout << "operator[]" << std::endl;
	if (x >= this->size)
	{
		std::cout << "Index out of range...";
		return (this->head)[0];
	}
	else
	{
		return (this->head)[x];
	}
}

int CppArray::getSize() const
{
	std::cout << "getSize()" << std::endl;
	return this->size;
}

float *CppArray::getHead() const
{
	std::cout << "getHead()" << std::endl;
	return this->head;
}

std::istream &operator>>(std::istream &is, CppArray &cppArr)
{
	std::cout << "operator>>" << std::endl;
	for (int i = 0; i < cppArr.size; i++)
	{
		is >> cppArr.head[i];
	}
	return is;
}

std::ostream &operator<<(std::ostream &os, CppArray &cppArr)
{
	std::cout << "operator<<" << std::endl;
	for (int i = 0; i < cppArr.size; i++)
	{
		os << cppArr.head[i] << std::endl;
	}
	return os;
}

int main(void)
{

	CppArray arr(5, 100);

	std::cout << arr.getSize();
	system("pause");
	return 0;
}

印出的size與初始化的值不同
謝謝大家的幫忙