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C++程序设计 实验报告 课程：C++程序实践 姓名： 闫三木 实验名称：C++面向对象程序实践 学号：： 一、实验目的 、实验环境、实验内容 class CPoint { private: int x, y; static int nCount; public: CPoint(int px=0, int py=0) { x=px; y=py; nCount++; } CPoint(CPoint p) { x=p.x; y=p.y; } ~CPoint(){nCount--;} int GetX() { return x; } int GetY() { return y; } void SetX(int x1) { x=x1; } void SetY(int y1) { y=y1; } void ShowPoint() { coutxendl; coutyendl; } static int number() { return nCount; } }; int CPoint::nCount=0; 2. “平面上线段”类的定义： 关键代码： int CPoint::nCount=0; CPoint::CPoint(int px,int py) { x=px; y=py; nCount++; } CPoint::CPoint(CPoint p) { x=p.x; y=p.y; } CPoint::~CPoint() { } int CPoint::GetX() { return x; } int CPoint::GetY() { return y; } void CPoint::SetX(int px) { x=px; } void CPoint::SetY(int py) { y=py; } void CPoint::ShowPoint() { coutx = xendl; couty = yendl; } int CPoint::GetnCount() { return nCount; } class CLine { private: CPoint pt1, pt2; double length; public: CLine(); CLine(int x1,int y1,int x2,int y2); CLine(CPoint p1,CPoint p2); double Getlength(); void ShowLine(); }; CLine::CLine() { } CLine::CLine(int x1,int y1,int x2,int y2):pt1(x1,y1),pt2(x2,y2){} CLine::CLine(CPoint p1,CPoint p2):pt1(p1),pt2(p2){} double CLine::Getlength() { int m=pt1.GetX()-pt2.GetX(); int n=pt1.GetY()-pt2.GetY(); length=sqrt(m*m+n*n); return length; } void CLine::ShowLine() { coutthe length is = Getlength()endl; } 3. “空间中点”类的定义： 关键代码： CThreePoint::CThreePoint(){} CThreePoint::CThreePoint(int ptx, int pty, int ptz) { SetX(ptx); SetY(pty); SetZ(ptz); } void CThreePoint::SetZ(int ptz) { z = ptz; } int CThreePoint::GetZ() { return z; } void CThreePoint::ShowPoint() { coutx = GetX()endl; couty = GetY()endl; coutz = zendl; } 4.关键代码： #includeiostream.h class Animal { private: int age; public: void ShowAge() { coutage=ageendl; } }; class dog: public Animal { void SetAge(int n=0) { age=n;