Question

声明一个circle类,有数据成员Radius,成员函数GetArea(),计算圆的面积,构造一个circle的对象,进行测试

急啊!!!!!!!!!!!!!!!!!!!!!!!

Answer 1

#include <iostream>旦核
using namespace std;

class circle
{
public:
float GetArea();
circle(); //重载构造函模扒掘数
circle(float r);//此袜重载构造函数
public:
float Radius;
};
circle::circle()
{
Radius=1.0;
}
circle::circle(float r)
{
Radius=r;
}
float circle::GetArea()
{
return Radius*Radius*3.14;
}
int main()
{
circle c1;
cout<<"圆1的面积:"<<c1.GetArea()<<endl;

circle c2(10);
cout<<"圆2的面积:"<<c2.GetArea()<<endl;

return 0;
}