编写一个球体Ball类，数据成员有半径，成员函数有构造函数、求体积函数，求表面积函数编写主函数创建两个球对象，计算这两个球体的体积和表面积，并输出每个球体的体积和表面积。

好的，以下是实现代码：

#include <iostream>
using namespace std;

class Ball {
private:
    double radius;
public:
    Ball(double r) : radius(r) {}  // 构造函数
    double getVolume() {  // 求体积
        return 4.0 / 3.0 * 3.14159 * radius * radius * radius;
    }
    double getSurfaceArea() {  // 求表面积
        return 4.0 * 3.14159 * radius * radius;
    }
};

int main() {
    Ball ball1(3.0);
    Ball ball2(4.0);
    cout << "Ball 1: volume = " << ball1.getVolume()
         << ", surface area = " << ball1.getSurfaceArea() << endl;
    cout << "Ball 2: volume = " << ball2.getVolume()
         << ", surface area = " << ball2.getSurfaceArea() << endl;
    cout << "The sum of volumes = " << ball1.getVolume() + ball2.getVolume() << endl;
    cout << "The sum of surface areas = " << ball1.getSurfaceArea() + ball2.getSurfaceArea() << endl;
    return 0;
}

输出结果如下：

Ball 1: volume = 113.097, surface area = 113.097
Ball 2: volume = 268.082, surface area = 201.062
The sum of volumes = 381.179
The sum of surface areas = 314.159