#include "stdio.h"
#include "stdlib.h"

typedef struct _teacher
{
    char name[10];
    int age;
    char *title;
}Teacher;

int freeTea(Teacher *t1)
{
    if(t1==NULL)
    {
        return -1;
    }
    //t1->title = "World!";  可以修改title的值为什么不能释放内存?
    free(t1->title);
    t1->title = NULL;
    return 0;
}

int main()
{
    Teacher tVar1;
    
    tVar1.title = (char *)malloc(100);
    tVar1.title = "Heelo!";
    
    printf("%s", tVar1.title);
    
    if(tVar1.title!=NULL)
    {
        freeTea(&tVar1);
    }
    
    system("pause");    
    return 0;
}