C++ 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()
{
Circle cir(3);
cir.Perimeter();
cir.Area();
cout << endl;
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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