C++程序设计2018年10月考试设计题代码参考

设计一个圆类Circle和一个桌子类Table，类Circle包含私有数据成员半径radius和求圆面积的成员函数getarea()，类Table包含私有数据成员高度height和成员函数getheight()，另设计一个圆桌类Roundtable是类Circle和类Table两个类的派生，私有数据成员color和成员函数getcolor()，要求输出一个圆桌的面积、高度和颜色等数据.  

VC++6.0解题方法代码： 

#include <iostream> #include <string> using namespace std; const double PI = 3.14159; class Circle { private: double radius; public: Circle(double r){ radius = r;} double getarea(){return radius * radius * PI;} }; class Table { private: double height; public: Table(double h){ height = h;} double getheight(){ return height; } }; class Roundtable:public Circle,public Table { private: char color[8]; public: Roundtable(double r,double h,char *c):Circle(r),Table(h) { strcpy(color,c);} char* getcolor(){return color;} }; int main() { Roundtable rt(10.0,1.8,"黑色"); cout << rt.getarea() << endl; cout << rt.getheight() << endl; cout << rt.getcolor() << endl; return 0; }

输出结果： 

314.159 1.8 黑色

 

VS code 解题方法代码：

#define _CRT_SECURE_NO_WARNINGS #include <iostream> #include <cstring> using namespace std; const double PI = 3.14159; class Circle { private: double radius; public: Circle(double r){ radius = r;} double getarea(){return radius * radius * PI;} }; class Table { private: double height; public: Table(double h){ height = h;} double getheight(){ return height; } }; class Roundtable:public Circle,public Table { private: char color[8]; public: Roundtable(double r,double h,const char *c):Circle(r),Table(h) { strcpy(color,c);} char* getcolor(){return color;} }; int main() { Roundtable rt(10.0,1.8,"黑色"); cout << rt.getarea() << endl; cout << rt.getheight() << endl; cout << rt.getcolor() << endl; return 0; }

VS 2017解题方法代码：

#define _CRT_SECURE_NO_WARNINGS #include <iostream> #include <string> using namespace std; const double PI = 3.14159; class Circle { private: double radius; public: Circle(double r) { radius = r; } double getarea() { return radius * radius * PI; } }; class Table { private: double height; public: Table(double h) { height = h; } double getheight() { return height; } }; class Roundtable :public Circle, public Table { private: string color; public: Roundtable(double r, double h, string c) :Circle(r), Table(h) { color = c; } string getcolor() { return color; } friend ostream &operator << (ostream &,Roundtable); //使用string类需要运算符重载 }; ostream &operator << (ostream &stream,Roundtable shuchu) { stream << shuchu.color ; return stream; } int main() { Roundtable rt(10.0, 1.8, "黑色"); cout << rt.getarea() << endl; cout << rt.getheight() << endl; cout << rt.getcolor() << endl; return 0; }