指针的引用

 1 // GrabCut_328.cpp : 定义控制台应用程序的入口点。
 2 //
 3 
 4 #include "stdafx.h"
 5 #include<iostream>
 6 using namespace std;
 7 
 8 struct  Teacher
 9 {
10     char name[64];
11     int age;
12 };
13 
14 void getTeacher(Teacher**P)
15 {
16     Teacher *tmp = NULL;
17     tmp = (Teacher*)malloc(sizeof(Teacher));
18     tmp->age = 33;
19     //p是实参的地址  *实参的地址  去间接的修改实参的值
20     *P = tmp;
21     //return 0;
22 }
23 void getTeacher2(Teacher* &myp)
24 {
25     //给mpy赋值  相当于给Main函数中的pT1赋值
26     myp = (Teacher*)malloc(sizeof(Teacher));
27     myp->age = 36;
28     //return 0;
29 }
30 
31 int _tmain(int argc, _TCHAR* argv[])
32 {
33     Teacher *pT1 = NULL;
34     //C语言中的二级指针
35     getTeacher(&pT1);
36     cout << "age:" << pT1->age << endl;
37     
38     //C++中的引用（指针的引用）
39     getTeacher2(pT1);
40     cout << "age:" << pT1->age << endl;
41 
42     system("pause");
43 }