單鏈表的建立、添加、刪除操作

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>

typedef struct LNode
{
  int data;
  struct LNode *next;
}*Lnode;

//init the single linked list
void Init_L(struct LNode *p)
{
  int n;
  int i = 0;
  Lnode q;
  Lnode  linklist;
  //p = (Lnode) malloc(sizeof(Lnode));
  if(p == NULL)
  {
    puts("error!");
    exit(0);
  }
  linklist = p;
  while(p)
  {
    //i++;
    scanf("%d", &n);
    if(n == -1)
      break;
    q = (Lnode) malloc(sizeof(Lnode));
    p->data = n;
    p->next = q;
    p = q;
    i++;
  }
  q->next = NULL;
  for(i; i > 0; i--)
  {
    printf("/n%d/n", linklist->data);
    linklist = linklist->next;
  }
}

//insert the single linked list
Insert_L(struct LNode *p, int i, int n)
{
  int length = 0;
  int j = 1;
  struct LNode *linklist;
  Lnode p1;
  Lnode q;
  linklist = p;
  p1 = p;
  while(p->next != NULL)
  {
    p = p->next;
    length++;
  }
  printf("length:%d/n", length);
  if((length < i) || (i < 1))
    puts("insert postion is error");
  q = (Lnode) malloc(sizeof(Lnode));
  if(!q)
  {
    puts("malloc errored!");
    exit(0);
  }
  while((p1->next != NULL) && (j < i - 1))
  {
    p1 = p1->next;
    j++;
  }
  if((p1->next) == NULL || (j > i))
  {
    puts("Insert error!");
    exit(0);
  }
  q->data = n;
  q->next = p1->next;
  p1->next = q;
  while(linklist->next != NULL)
  {
    printf("%d/n", linklist->data);
    linklist = linklist->next;
  }
}

//delete from linklist
Delete_L(struct LNode *p, int i)
{
  Lnode q = p;
  Lnode q1 = p;
  int j = 0;
  /*
  while(p->next != NULL)
  {
    printf("%d/n", p->data);
    p = p->next;
  }
  exit(0);
  */
  while((p->next != NULL) && (j < i - 1))
  {
    q1 = p;
    p = p->next;
    j++;
  }
  if((p->next == NULL) || (j > i))
  {
    puts("delete error!");
    exit(0);
  }
  q1->next = p->next;
  while(q->next != NULL)
  {
    printf("%d/n", q->data);
    q = q->next;
  }
}

int main(int argc, char **argv)
{
  struct LNode *ll;
  int i;
  int n;
  ll = (struct LNode *)malloc(sizeof(struct LNode));
  Init_L(ll);
  puts("please input the location and value of insert:");
  scanf("%d %d", &i, &n);
  Insert_L(ll, i, n);
  puts("please input the location of delete:");
  scanf("%d", &i);
  Delete_L(ll, i);
  return 0;
}