指针的引用

// GrabCut_328.cpp : 定义控制台应用程序的入口点。
//

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

struct  Teacher
{
    char name[64];
    int age;
};

void getTeacher(Teacher**P)
{
    Teacher *tmp = NULL;
    tmp = (Teacher*)malloc(sizeof(Teacher));
    tmp->age = 33;
    //p是实参的地址  *实参的地址  去间接的修改实参的值
    *P = tmp;
    //return 0;
}
void getTeacher2(Teacher* &myp)
{
    //给mpy赋值  相当于给Main函数中的pT1赋值
    myp = (Teacher*)malloc(sizeof(Teacher));
    myp->age = 36;
    //return 0;
}

int _tmain(int argc, _TCHAR* argv[])
{
    Teacher *pT1 = NULL;
    //C语言中的二级指针
    getTeacher(&pT1);
    cout << "age:" << pT1->age << endl;
    
    //C++中的引用（指针的引用）
    getTeacher2(pT1);
    cout << "age:" << pT1->age << endl;

    system("pause");
}