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按以下的提示,由基类的设计和测试开始,逐渐地完成各个类的设计,求出圆格柱体的表面积、体积并输出并且完成要求的计算任务:(1)先建立一个Point(点)类,包含数据成员x,y(坐标点),实现需要的成员函数,并设计main函数完成测试;
/* *Copyright (c) 2015,烟台大学计算机学院 *All gight reserved. *文件名称:Demo.cpp *作者:邵帅 *完成时间:2015年05月25日 *版本号:v1.0 */ #include <iostream> using namespace std; class Point { public: Point(double x=0,double y=0); void setpoint(double x0,double y0) { x=x0; y=y0; } double getx(){return x;} double gety(){return y;} private: double x,y; }; Point::Point(double x0,double y0):x(x0),y(y0){} int main() { Point p; p.setpoint(2,3); cout<<"x="<<p.getx()<<endl; cout<<"y="<<p.gety()<<endl; }
(2)以Point为基类,派生出一个Circle(圆)类,增加数据成员r(半径),以及求面积的成员函数area,实现其他需要的成员函数,设计main函数完成测试;
/* *Copyright (c) 2015,烟台大学计算机学院 *All gight reserved. *文件名称:Demo.cpp *作者:邵帅 *完成时间:2015年05月25日 *版本号:v1.0 */ #include <iostream> using namespace std; class Point { public: Point(double x=0,double y=0); void setpoint(double a,double b) { x=a; y=b; } double getx(){return x;} double gety(){return y;} protected: double x,y; }; Point::Point(double a,double b):x(a),y(b){} class Circle:public Point { public: Circle(double x=0,double y=0,double r=0); void setradius(double); double getradius(); double area(); protected: double radius; }; Circle::Circle(double a,double b,double r):Point(a,b),radius(r){} void Circle::setradius(double r0) { radius=r0; } double Circle::getradius() {return radius;} double Circle::area() { double s; const double pi=3.1415; s=pi*radius*radius; return s; } int main() { Circle p; p.setpoint(2,3); p.setradius(3); cout<<"圆心坐标:"<<endl; cout<<"x="<<p.Point::getx()<<endl; cout<<"y="<<p.Point::gety()<<endl; cout<<"圆的半径="; cout<<p.getradius()<<endl; cout<<"圆的面积="; cout<<p.area(); }
(3)再以Circle类为直接基类,派生出一个Cylinder(圆柱体)类,再增加数据成员h(高),,以及求圆柱表面积的成员函数area和求圆柱体积的成员函数volume,实现需要的成员函数,并设计main函数完成测试。
/* *Copyright (c) 2015,烟台大学计算机学院 *All gight reserved. *文件名称:Demo.cpp *作者:邵帅 *完成时间:2015年05月25日 *版本号:v1.0 */ #include <iostream> using namespace std; class Point { public: Point(double x=0,double y=0); void setpoint(double a,double b) { x=a; y=b; } double getx(){return x;} double gety(){return y;} protected: double x,y; }; Point::Point(double a,double b):x(a),y(b){} class Circle:public Point { public: Circle(double x=0,double y=0,double r=0); void setradius(double); double getradius(); double area(); protected: double radius; }; Circle::Circle(double a,double b,double r):Point(a,b),radius(r){} void Circle::setradius(double r0) { radius=r0; } double Circle::getradius() {return radius;} double Circle::area() { double s; const double pi=3.1415; s=pi*radius*radius; return s; } class Cylinder:public Circle { public: Cylinder(double x=0,double y=0,double r=0,double h=0); void setheight(double); double getheight(); double volume(); double larea(); protected: double height; }; Cylinder::Cylinder(double a,double b,double r,double h):Circle(a,b,r),height(h){} void Cylinder::setheight(double h) { height=h; } double Cylinder::getheight(){return height;} double Cylinder::larea() { double s; s=2*Circle::area( )+2*3.14159*radius*height; return s; } double Cylinder::volume() { double v; v=area()*height; return v; } int main() { Cylinder p; p.setpoint(2,3); p.setradius(3); p.setheight(5); cout<<"圆柱底圆圆心坐标:"<<endl; cout<<"x="<<p.Point::getx()<<endl; cout<<"y="<<p.Point::gety()<<endl; cout<<"圆柱底圆圆的半径="; cout<<p.getradius()<<endl; cout<<"圆柱的表面积="; cout<<p.larea()<<endl; cout<<"圆柱的高="; cout<<p.getheight()<<endl; cout<<"圆柱的体积="; cout<<p.volume(); }
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原文地址:http://blog.csdn.net/mayuko2012/article/details/45974483