//声明一个结构体
typedef struct Person {
  char name[20];
  int age;
  char *alias;
}Person;

//拷贝方法
void copyPerson(Person *from, Person *to){

  *to = *from;
}
//main函数
int main(int argc, const char * argv[]) {

  Person p1;
  p1.age = 11;
  strcpy(p1.name, "royce");
  p1.alias = "owen";
  Person p2;

  copyPerson(&p1, &p2);

  printf("p2:%p p1:%p\np2-alias:%p p1-alias:%p\n",&p2,&p1,p2.alias,p1.alias);

  return 0;
}
//打印
p2-alias:0x100000f80 p1-alias:0x100000f80

void copyPerson(Person *from, Person *to){

  *to = *from;
  to->alias = (char *)malloc(100);
  strcpy(to->alias, from->alias);

}
//打印
p2-alias:0x1003069a0 p1-alias:0x100000f82