实例：`` 求园柱的体积
//面向对象 #include <iostream> using namespace std; class garden { private: double m_hight; double m_radius; public: garden(double hight,double radius):m_hight(hight),m_radius(radius) { } double getgarden() { return 3.1415*m_radius*m_hight; } }; int main() { double r,h; cin>>r>>h; garden c(h,r); cout << c.getgarden() << endl; return 0; } //面向过程 #include<iostream> #define GARDENR 3.1415 int main() { double higth,radius; std::cin>>higth>>radius; std::cout<<GARDENR*higth*radius<<std::endl; return 0; }