一篇文章带你了解C++面向对象编程--继承

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classShape {

public:

Shape() {// 构造函数

cout <<"Shape -> Constructor"<< endl;

}

~Shape() {// 析构函数

cout <<"Shape -> Destructor"<< endl;

}

voidPerimeter() {// 求 Shape 周长

cout <<"Shape -> Perimeter"<< endl;

}

voidArea() {// 求 Shape 面积

cout <<"Shape -> Area"<< endl;

}

};

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classCircle :publicShape {

public:

Circle(intradius) :_r(radius) {

cout <<"Circle -> Constructor"<< endl;

}

~Circle() {

cout <<"Circle -> Destructor"<< endl;

}

voidPerimeter() {

cout <<"Circle -> Perimeter : "

<< 2 * 3.14 * _r << endl;// 圆周率取 3.14

}

voidArea() {

cout <<"Circle -> Perimeter : "

<< 3.14 * _r * _r << endl;// 圆周率取 3.14

}

private:

int_r;

};

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classRectangular :publicShape {

public:

Rectangular(intlength,intwidth) :_len(length), _wid(width) {

cout <<"Rectangular -> Contructor"<< endl;

}

~Rectangular() {

cout <<"Rectangular -> Destructor"<< endl;

}

voidPerimeter() {

cout <<"Rectangular -> Perimeter : "

<< 2 * (_len + _wid) << endl;

}

voidArea() {

cout <<"Rectangular -> Area : "

<< _len * _wid << endl;

}

private:

int_len;

int_wid;

};

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intmain()

{

/* 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;

return0;

}