C++ 画圆

#include <iostream>
#include <cmath>

#define PI 3.14159
 
using namespace std;

class Point
{
public:
	Point() : x(0), y(0){
		
	}
	
	Point(double x1, double y1) : x(x1), y(y1) {
		
	}
	
	double get_x() const {
		return x;
	}
	
	double get_y() const {
		return y;
	}
	
	void move(double dx, double dy) {
		x += dx;
		y += dy;
	}
	
private:
    double x, y;
};

void printMatrix(int arr[80][80]) {
	for(int i = 0; i < 80; i++){
		for(int j = 0; j < 80; j ++){
			if(arr[i][j] == 0){
				cout << ". ";
			}else{
				cout << "@ ";
			}
		}
		cout << endl;
	}
}

int main()
{
	Point center(40, 40);
	
	int arr[80][80] = {0};
	
	double r = 9;
	double angle = 0;
	
	while(angle < 360){
		double x = r * cos(angle / 180 * PI) + center.get_x();
		double y = r * sin(angle / 180 * PI) + center.get_y();
		
		cout << "x = " << x << " y = " << y << endl;
		
		arr[(int)y][(int)x] = 1;
		
		++angle;	
	}
	
	printMatrix(arr);
}