14.5

1 /*  2 author:shajin  3 date:2013-4-6  4 */  5 #include 
      
         6 #include
       
          7 using namespace std;  8 class Shape  9 { 10 public: 11     double area(); 12     double girth(); 13     void show(); 14 }; 15 double Shape::area() 16 { 17     return 0; 18 } 19  20 double Shape::girth() 21 { 22     return 0.0; 23 } 24  25 void Shape::show() 26 { 27     cout<<"Shape Object:"<
        
         a=a; 78     this->b=b; 79     this->c=c; 80 } 81 double Triangle::area() 82 { 83     double s=(a+b+c)/2; 84     return sqrt(s*(s-a)*(s-b)*(s-c)); 85 } 86 double Triangle::girth() 87 { 88     return a+b+c; 89 } 90 void Triangle::show() 91 { 92     cout<<"Triangle:"<
         <<
           
            <
           
        
       
      

14.6

 

1 // 文件point.h: 类Point的定义 2 #if !defined __POINT__H__ 3 #define __POINT__H__ 4  5 #include 
      
        6  7 class Point 8 { 9     friend ostream &operator << (ostream &, const Point &);10 public:11     // 重载的构造函数12     Point(double = 0, double = 0);13     Point(const Point &p); // 复制构造函数14 15     // 析构函数16     ~Point();17 18     // 重载的定值函数19     void setPoint(double a, double b);20     void setPoint(Point &p);21 22     // 取值函数23     double getX()const24     {25         return x;26     } double getY()const27     {28         return y;29     }30 31 private:32     double x, y;33 };34 35 #endif
      

1 // 文件point.cpp: 类Point的实现 2 #include "point.h" 3  4 Point::Point(double a, double b) 5 { 6     x = a; 7     y = b; 8 } 9 10 Point::Point(const Point &p)11 {12     x = p.getX();13     y = p.getY();14 }15 16 Point::~Point(){}17 18 void Point::setPoint(double a, double b)19 {20     x = a;21     y = b;22 }23 24 void Point::setPoint(Point &p)25 {26     x = p.getX();27     y = p.getY();28 }29 30 ostream &operator << (ostream &os, const Point &point)31 {32     os << "(" << point.x << ", " << point.y << ")";33     return os;34 }

1 // 文件line.h: 类Line的定义 2 #if !defined __LINE__H__ 3 #define __LINE__H__ 4  5 #include 
      
        6 #include "point.h" 7  8 class Line { 9     friend ostream & operator<< (ostream &, const Line &);10 public:11     // 重载的构造函数12     Line(double startX = 0, double startY = 0, double endX = 0, double endY = 0);13     Line(Point start, Point end);14     Line(Line &line);    //复制构造函数15 16     // 析构函数17     ~Line();18 19     // 重载的定值函数20     void setLine(double startX = 0, double startY = 0, double endX = 0, double endY = 0);21     void setLine(Point , Point );22 23     double getLength() const; // 计算线段的长度24 25     // 取值函数26     Point getStartPoint()  {
    return startPoint;}27     Point getEndPoint()  {
    return endPoint;}28 29 private:30     Point startPoint, endPoint;31 };32 33 #endif