C++面向对象编程--继承
Wonderfulness 人气:0C++ 面向对象编程 —— 继承
"Shape" 基类
class Shape { public: Shape() { // 构造函数 cout << "Shape -> Constructor" << endl; } ~Shape() { // 析构函数 cout << "Shape -> Destructor" << endl; } void Perimeter() { // 求 Shape 周长 cout << "Shape -> Perimeter" << endl; } void Area() { // 求 Shape 面积 cout << "Shape -> Area" << endl; } };
"Circle" 派生类
"Circle" 类继承于 “Shape” 类
class Circle : public Shape { public: Circle(int radius) :_r(radius) { cout << "Circle -> Constructor" << endl; } ~Circle() { cout << "Circle -> Destructor" << endl; } void Perimeter() { cout << "Circle -> Perimeter : " << 2 * 3.14 * _r << endl; // 圆周率取 3.14 } void Area() { cout << "Circle -> Perimeter : " << 3.14 * _r * _r << endl; // 圆周率取 3.14 } private: int _r; };
"Rectangular" 派生类
"Rectangular" 类继承于 “Shape” 类
class Rectangular : public Shape { public: Rectangular(int length, int width) :_len(length), _wid(width) { cout << "Rectangular -> Contructor" << endl; } ~Rectangular() { cout << "Rectangular -> Destructor" << endl; } void Perimeter() { cout << "Rectangular -> Perimeter : " << 2 * (_len + _wid) << endl; } void Area() { cout << "Rectangular -> Area : " << _len * _wid << endl; } private: int _len; int _wid; };
"main()" 函数
int main() { /* 创建 Circle 类对象 cir */ Circle cir(3); cir.Perimeter(); cir.Area(); cout << endl; /* 创建 Rectangle 类对象 rec */ Rectangular rec(2, 3); rec.Perimeter(); rec.Area(); cout << endl; return 0; }
运行结果
1.创建派生类对象 :
基类的 Constructor 先执行,然后执行子类的 Constructor
2.析构派生类对象 :
派生类的 Destructor 先执行,然后执行基类的 Destructor
总结
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