Question

设计一个圆类Circle，具有属性：圆心坐标x和y及圆半径r，除具有设置及获取属性的方法外，还具有计算周长的

要原创啊，我把分全抛出去了。。。。

Answer 1

#define MATH_PI 3.1415926
class Circle
{
public:
Circle():cx(0), cy(0),r(0){};
Circle(double x_in, double y_in, double r_in):cx(x_in), cy(y_in),r(r_in){};
public:
double centerX()const {return cx;};
double centerY()const {return cy;};
double setCenterX(double x_in){cx = x_in;};
double setCenterY(double x_in){cy = y_in;};
double getPerimeter()const{return 2*MATH_PI*r;};
private:
double cx;
double cy;
double r;
}