C++程序设计作业.doc

编写程序：1. 定义一个Point类来处理三维点points(x,y,z).该类有一默认的constructor,一copy constructor, 一negate()成员函数将point的x,y和z值各乘-1, 一norm()成员函数返回该点到原点（0，0，0）的距离，一个print()成员函数显示x,y,和z的值。2定义一个Person类,它的每个对象表示一个人。数据成员必须包含姓名、出生年份、死亡年份，一个默认的构造函数，一析构函数，读取数据的成员函数，一个print()成员函数显示所有数据。3。定义一个Shape基类，由它派生出Rectanglr和Circle类，二者都有GetArea( )函数计算对象的面积。使用Rectangle 类创建一个派生类Square。4. 定义一个Shape抽象类，由它派生出Rectanglr和Circle类，二者都有GetArea( )函数计算对象的面积，GetPerim( ) 函数计算对象的周长。第一题目：#include #include class Point public: Point(float x=0, float y=0, float z=0): x_(x), y_(y), z_(z) Point(const Point& p) : x_(p.x_), y_(p.y_), z_(p.z_) void negate() x_ *= -1; y_ *= -1; z_ *= -1; double norm() return sqrt(x_*x_ + y_*y_ + z_*z_); void print() cout ( x_ , y_ , z_ ); private: float x_, y_, z_;void main() Point p(12,-3,4); cout p = ; p.print(); cout , p.norm() = p.norm() endl; p.negate(); cout p = ; p.print(); cout , p.norm() = p.norm() endl;第二题：#include class Person public: Person(char* =0, int =0, int =0); Person() delete name_; char* name() return name_; int born() return yob_; int died() return yod_; void print(); private: int len_; char* name_; int yob_, yod_;void main() Person cb(Charles Babbage,1792,1871); cb.print();Person:Person(char* name, int yob, int yod) : len_(strlen(name), name_(new charlen_+1), yob_(yob), yod_(yod) memcpy(name_, name, len_+1);void Person:print() cout tName: name_ endl; if (yob_) cout tBorn: yob_ endl; if (yod_) cout tDied: yod_ endl;第三题：class Shapeprotected:public: double GetArea()return 0;class Rectangle : public Shapeprotected: double length; double width;public: Rectangle() Rectangle(double l, double w)length = l;width = w; double GetArea()return length * width;class Circle : public Shapeprotected: double radius;public: Circle(double r)radius = r; double GetArea()return 3.1415926 * radius * radius;class Square : public Rectangleprotected:public: Square(double l) length = width = l; double GetArea()return length * width;第四题：class Shape public: Shape() virtual double GetArea()=0; virtual double Getperim()=0;class Rectangle:public Shape private: double h; double c; public: Rectangle()h=c=0; Rectangle(double hi,double ch)h=hi;c=ch; double GetArea()return c*h; double Getperim()return 2*c+2*h;class Circle:public Shape private: double r; const doub