【Cherno的C++视频】Classes in C++

#include 

class Player
{
public:
	double m_x;
	double m_y;
	double m_speed;

public:
	void Move(double a, double b);
};

int main(void)
{
	Player player;
	player.m_x = 5;
	player.m_y = 4;
	player.Move(-1, -1);

	std::cin.get();
}

void Player::Move(double a, double b)
{
	m_x += a * m_speed;
	m_y += b * m_speed;
}