单继承析构函数与构造函数

/*

 * 继承

 * 派生类构造函数的执行情况

 * Lzy   2011-七夕

 */

 

#include

using namespace std;

 

class CPoint

{

protected:

   float x, y;

public:

   CPoint(float _x, float _y):x(_x),y(_y){cout<<"构造函数CPoint被调用:"<" "<

   CPoint(const CPoint & P):x(P.x),y(P.y){cout<<"复制构造函数CPoint被调用:"<" "<

   float getX(){return x;}

   float getY(){return y;}

};

 

class CCircle : public CPoint

{

protected:

   float r;

public:

   CCircle(float _x, float _y,float _r):CPoint(_x,_y),r(_r){cout<<"构造函数CCircle被调用:"<" "<

   CCircle(const CPoint &C,float _r):CPoint(C),r(_r){cout<<"复制构造函数CCircle被调用:"<" "<

   double area(){return 3.14*r*r;}

   double circumference(){return 3.14*2*r;}

};

 

int main(void)

{

   CPoint p1(1,1);

   CCircle(p1,2);

  

   return 0;

}

 

/*

 * 继承

 * 析构函数执行，先执行派生类，再执行子对象最后执行基类的析构函数

 * Lzy   2011-七夕

 */

 

#include

using namespace std;

 

class A

{

private:

   int a, b;

public:

   A():a(0),b(0){}

   A(int x, int y):a(x),b(y){}

   ~A(){cout<<"A类析构函数："<" "<

 

};

class B:public A

{

private:

   int c;

public:

   B():c(0){}

   B(int x, int y,int z):A(x,y),c(z){}

   ~B(){cout<<"B类析构函数："<

};

 

 

int main(void)

{

   A a(3,3);

   B b(5,5,5);

 

   return 0;

}