《面向对象程序设计C++》试卷

【文件属性】：
文件名称：《面向对象程序设计C++》试卷
文件大小：58KB
文件格式：DOC
更新时间：2016-06-27 13:42:18
期末考试必备 #include using namespace std; class base { public: virtual float area() const { return 0; } }; class triangle: public base { protected: float bian,height; public: triangle(float a=0, float h=0) { bian=a; height=h; } virtual float area() const { return bian*height/2; } }; class square: public base { protected: float bian; public: square(float a=0) { bian=a; } virtual float area() const { return bian*bian; } }; class circle: public base { protected: float radius; public: circle(float r=0) { radius=r; } virtual float area() const { return 3.14*radius*radius; } }; int main() { triangle t(3,4); square s(5); circle c(2); base *p; p=&t; cout<<"triangle's area:"<area()<area()<area()<