C语言指针，请问三者区别

#include
#include
main()
{
struct stu
{
char name[20];
}*p;
p=(struct stu )malloc(sizeof(struct stu));
scanf("%s",p->name);
printf("name:%s\n",&(p->name));
printf("name:%s\n",*&(p->name));
printf("name:%s \n",&(p->name));
}
这三者作用相同，意思有什么不同么
都能编译运行，都能输出,q区别什么