int main()
{
	int i = 1;
	// 隱式類型轉(zhuǎn)換(意義相近的類型)
	double d = i;
	printf("%d, %.2f\n", i, d);

	int* p = &i;
	// 顯示的強制類型轉(zhuǎn)換(意義不相近的類型，值轉(zhuǎn)換后有意義)
	int address = (int)p;

	printf("%x, %d\n", p, address);

	return 0;
}

int main()
{
	double d = 12.34;
	int a = static_cast<int>(d); // 意義相近的
	cout << a << endl;

	int* p = &a;
	// 不支持的
	//int address = static_cast<int>(p); // 意義不相近
	return 0;
}

int main()
{
	double d = 12.34;
	int a = static_cast<int>(d); // 意義相近
	cout << a << endl;

	int* p = &a;
	// 不支持的
	//int address = static_cast<int>(p);
	int address = reinterpret_cast<int>(p); // 意義不相近
	return 0;
}

int main()
{
	// const int a = 2;
	volatile const int a = 2;
	int* p = const_cast<int*>(&a);
	//int* p = (int*)&a;

	*p = 3;

	cout << a << endl;  // 2
	cout << *p << endl; // 3


	return 0;
}

class A
{
public:
	virtual void f(){}
public:
	int _a = 0;
};

class B : public A
{
public:
	int _b = 1;
};

// A*指針pa有可能指向父類，有可能指向子類
void fun(A* pa)
{
	// 如果pa是指向子類，那么可以轉(zhuǎn)換，轉(zhuǎn)換表達式返回正確的地址
	// 如果pa是指向父類，那么不能轉(zhuǎn)換，轉(zhuǎn)換表達式返回nullptr
	B* pb = dynamic_cast<B*>(pa); // 安全的
	//B* pb = (B*)pa;             // 不安全
	if (pb)
	{
		cout << "轉(zhuǎn)換成功" << endl;
		pb->_a++;
		pb->_b++;
		cout << pb->_a << ":" << pb->_b << endl;
	}
	else
	{
		cout << "轉(zhuǎn)換失敗" << endl;
		pa->_a++;
		cout << pa->_a << endl;
	}
}
// A 是父類   B是子類
int main()
{
	// 父類對象無論如何都是不允許轉(zhuǎn)換成子類對象的
	// A aa;
	// B bb = dynamic_cast<B>(aa); // 不支持
	// B bb = (B)aa;               // 不支持

	A aa;
	B bb;
	A* pa = &bb;

	B* pb = dynamic_cast<B*>(pa);

	//fun(nullptr);
	return 0;
}

class A1
{
public:
	virtual void f(){}
public:
	int _a1 = 0;
};

class A2
{
public:
	virtual void f(){}
public:
	int _a2 = 0;
};

class B : public A1, public A2
{
public:
	int _b = 1;
};

int main()
{
	B bb;
	A1* ptr1 = &bb;
	A2* ptr2 = &bb;
	cout << ptr1 << endl;
	cout << ptr2 << endl << endl;

	
	B* pb1 = (B*)ptr1;
	B* pb2 = (B*)ptr2;
	cout << pb1 << endl;
	cout << pb2 << endl << endl;

	B* pb3 = dynamic_cast<B*>(ptr1);
	B* pb4 = dynamic_cast<B*>(ptr2);
	cout << pb3 << endl;
	cout << pb4 << endl << endl;

	return 0;
}