cpp学习——类的封装

#include <iostream> using namespace std; #define PI 3.14 class Circle { public: double Radius; double calculateZC() { return 2 * PI * Radius; } }; int main() { Circle C1;//类的实例化 cout << "请输入半径："; cin >> C1.Radius; cout << "圆的周长为： " << C1.calculateZC() << endl; return 0; }