C++继承方式简介及公有继承

 1 #ifndef _POINT_H
 2 #define _POINT_H
 3 
 4 class Point {
 5     //基类point类的定义
 6 public:
 7     //公有成员函数
 8     void initPoint(float x = 0, float y = 0) {
 9         this->x = x;
10         this->y = y;
11     }
12     void move(float offx, float offy) {
13         x += offx;
14         y += offy;
15     }
16     float getX() const { return x; }
17     float getY() const { return y; }
18 
19 private:
20     //私有数据成员
21     float x, y;
22 
23 };
24 
25 #endif // !_POINT_H

 1 #ifndef _RECTANGLE_H
 2 #define _RECTANGLE_H
 3 #include "point.h"
 4 class Rectangle :public Point {
 5     //派生类定义部分
 6 public:
 7     //新增公有函数成员
 8     void initRectangle(float x, float y, float w, float h) {
 9         initPoint(x, y); //调用基类公有成员函数
10         this->w = w;
11         this->h = h;
12     }
13     float getH() const { return h; }
14     float getW() const { return w; }
15 private:
16     //新增私有数据成员
17     float w, h;
18 };
19 #endif // !_RECTANGLE_H

 1 #include <iostream>
 2 #include <cmath>
 3 #include "rectangle.h"
 4 using namespace std;
 5 
 6 
 7 int main()
 8 {
 9     Rectangle rect; //定义rectangle类对象
10     //设置矩形的参数
11     rect.initRectangle(2, 3, 20, 10);
12     rect.move(3, 2); //移动矩形数据
13     cout << "the data of rect(x,y,w,h):" << endl;
14     //输出矩形的特征参数
15     cout << rect.getX() << ","
16         << rect.getY() << ","
17         << rect.getW() << ","
18         << rect.getH() << endl;
19     return 0;
20 }