程序代码：

#include <iostream>
#include <stdlib.h>

using namespace std;

struct Teacher
{
    int age;
};

int getTeacher(Teacher **p)
{
    if(p == NULL)
    {
        return -1;
    }

    Teacher *temp;
    temp = (Teacher *)malloc(sizeof(Teacher));
    if(temp = NULL)
    {
        return -1;
    }

    temp->age = 23;
    *p = temp;

    return 0;
}

int main()
{
    Teacher *pt = NULL;
    getTeacher(&pt);

    cout << "pt->age=" << pt->age << endl;
    cout << "Hello world!" << endl;
    system("pause");
    return 0;
}