搜狗笔试题

#include <iostream>
#include <stdio.h>
using namespace std;

int main()
{
    int pid;
    int num = 1;

    pid = fork();

    if(pid > 0)
    {
         num ++;
         cout<<num<<endl;
         cout<<&num<<endl;
         cout<<endl;
    }
    else if(pid ==0)
    {
         cout<<num<<endl;
         cout<<&num<<endl;
         cout<<endl;
    }


    cout<<num<<endl;
    getchar();
    return 0;
}

// sougoutest.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <iostream>
using namespace std;

class A
{
public:
 virtual void test(float a){cout<<'1';}
};
class B:public A
{
public:
	void test(int b){cout<<'2';}
};
int _tmain(int argc, _TCHAR* argv[])
{

	A *a = new A;
	B *b = new B;
	a= b;
	a->test(1.1);
	a->test(1);
	b->test((float)1.1);//调不到父类的test？为何
	b->test(1);
	((A*)b)->test(1);//为何这样可以调用到父类？
	return 0;
}