令我费解的源码

一：

#include "stdafx.h"
#include  
using namespace std;

class A{
public:
	void  f()
	{
		cout<<"A"<f();                //输出A
	B* pb=(B *)pa;
	pb->f();	            //输出B
	delete pa,pb;
	pa=new B();
	pa->f();               //输出A
	pb=(B *)pa;
	pb->f();               //输出B
	return 0;
}

#include "stdafx.h"
#include  
using namespace std;

class A{
public:
	void virtual f()
	{
		cout<<"A"<f();                //输出A
	B* pb=(B *)pa;
	pb->f();	            //输出A
	delete pa,pb;
	pa=new B();
	pa->f();               //输出B
	pb=(B *)pa;
	pb->f();               //输出B
	return 0;
}

#include "stdafx.h"
#include 
using namespace std; 
 
class A
{
public:
    A() {m_a = 1; m_b = 2;}
    ~A() {}
    void fun() {printf("%d %d", m_a, m_b);}
private:
    int m_a;
    int m_b;
};
 
class B
{
public:
    B() {m_c = 3;}
    ~B() {}
    void fun() {printf("%d", m_c);}
private:
    int m_c;
};
 
void main()
{
    A a;
    B *pb = (B*)(&a);
    pb->fun();                        //输出1
}

#include "stdafx.h"
#include 
using namespace std; 
class A 
{ 
public: 
	int a;  
	A(){a=1;}  
	void print()
	{
		printf("%d\n",a);
	} 
}; 
class B:public A 
{ 
public:    
	int a;    
	B(){a=2;};
}; 
int main() 
{
	B b;  
	b.print();                    //输出1
	printf("%d\n",b.a);     //输出2
}

#include "stdafx.h"
#include 
using namespace std;

void main(void)
{
	char *p = "a";
	int i = (int)"a";
	int i2 = (int)p;
	//int i3 = static_cast(&p);//failed
	int i5 = reinterpret_cast(&p);
	cout << p <

#include "stdafx.h"
#include 
using namespace std;

void main(void)
{
	char *p = "a";
	int i = (int)"a";
	int i2 = (int)p;
	//int i3 = static_cast(p);//failed
	int i5 = reinterpret_cast(p);
	cout << p <