typedef struct node
{
  char name[10];
  int age;
  char sex[5];
  char telephonenumber[20];
  char adress[20];
  struct node *link;
}STU;
STU *creat_list(int n)
{
  STU *h,*p,*s;
  int i;
  if(h=(STU *)malloc(sizeof(STU))==NULL)
  {
   printf("Don't have enough space!\n");
   exit(0);
  }
  h->name[0]='\0';
  h->age=0;
  h->sex[0]='\0';
  h->telephonenumber[0]='\0';
  h->adress[0]='\0';
  h->link=NULL;
  p=h;
  for(i=0;i<n;i++)
  {
   if(s=(STU *)malloc(sizeof(STU))==NULL)
   {
    printf("Don't have enough space!\n");
    exit(0);
   }
   p->link=s;
   printf("Please input NO.%d student's name:",i+1);
   scanf("%s",s->name);
   printf("Please input NO.%d student's age:",i+1);
   scanf("%d",&s->age);
   printf("Please input NO.%d student's sex(boy/girl):",i+1);
   scanf("%s",s->sex);
   printf("Please input NO.%d student's telephone number:",i+1);
   scanf("%s",s->telephonenumber);
   printf("Please input NO.%d student's adress:",i+1);
   scanf("%s",s->adress);
   printf("\n");
   s->link=NULL;
   p=s;
  }
  return h;
}
为什么STU *creat_list(int n)返回值是NULL，而不是第一个结点的地址呢？

typedef struct node
 {
   char name[10];
   int age;
   char sex[5];
   char telephonenumber[20];
   char adress[20];
   struct node *link;
 }STU;
 STU *creat_list(int n)
 {
   STU *h,*p,*s;
   int i;
   if(h=(STU *)malloc(sizeof(STU))==NULL)//if((h=(STU *)malloc(sizeof(STU))) == NULL)
   {
    printf("Don't have enough space!\n");
    exit(0);
   }
   h->name[0]='\0';
   h->age=0;
   h->sex[0]='\0';
   h->telephonenumber[0]='\0';
   h->adress[0]='\0';
   h->link=NULL;
   p=h;
   for(i=0;i<n;i++)
   {
    if(s=(STU *)malloc(sizeof(STU))==NULL)//同上
    {
     printf("Don't have enough space!\n");
     exit(0);
    }
    p->link=s;
    printf("Please input NO.%d student's name:",i+1);
    scanf("%s",s->name);
    printf("Please input NO.%d student's age:",i+1);
    scanf("%d",&s->age);
    printf("Please input NO.%d student's sex(boy/girl):",i+1);
    scanf("%s",s->sex);
    printf("Please input NO.%d student's telephone number:",i+1);
    scanf("%s",s->telephonenumber);
    printf("Please input NO.%d student's adress:",i+1);
    scanf("%s",s->adress);
    printf("\n");
    s->link=NULL;
    p->link = s;
    p=s;
   }
   return h;
 }
 

嗯，谢谢版主，多谢了。

不好意思，没看见p->link = s这句上面已经有了，我加的请删去。虽然这样的先后关系不影响程序逻辑，但新结点的初始化与插入过程尽量不要掺在一起，分开写更符合思维逻辑。

楼主想明白了吗？

return h;是否改为 return h->link;更好啊？

我知道的。谢谢啊。

明白的，不过  想请教把return h;改为return h->link;是否更好啊？ 因为我要的是存入数据节点的地址，而不是初始化时h节点的地址。