题目描述
求圆的周长和面积,已知圆类从shape抽象类继承。
要求使用c++ class编写程序。可以创建如下class
#include <iostream>
using namespace std;
const double pi = 3.14;
class Shape{
public:
Shape(){}
~Shape(){}
virtual double getArea() = 0;
virtual double getPerim() = 0;
};
class Circle: public Shape{
public:
Circle(double rad):radius(rad){}
~Circle(){}
/*补充这两个函数*/
double getArea();
double getPerim();
private:
double radius;
};
int main() {
double radius;
cin >> radius;
Circle c(radius);
cout << c.getArea() << " " << c.getPerim() << endl;
}
输入描述
输入圆的半径
输出描述
输出圆的周长和面积
样例输入
10
样例输出
314 62.8
#include <iostream> using namespace std; const double pi = 3.14; class Shape{ public: Shape(){} ~Shape(){} virtual double getArea() = 0; virtual double getPerim() = 0; }; class Circle: public Shape{ public: Circle(double rad):radius(rad){} ~Circle(){} /*补充这两个函数*/ double getArea(); double getPerim(); private: double radius; }; double Circle::getArea(){ return (3.14*radius*radius); } double Circle::getPerim(){ return (2*3.14*radius); } int main() { double radius; cin >> radius; Circle c(radius); cout << c.getArea() << " " << c.getPerim() << endl; }