作业内容是:基于链式存储结构的图书信息表的新图书入库
以下为我的输入,输入到最后一行就报错终止了
输入图书信息的时候总链表一切正常,但当把新图书信息输入nl结点之后,总链表居然自己断链了,这是怎么回事?
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
typedef struct LNode
{
char no[20];
char name[50];
float price;
struct LNode *next;
}LNode, *LinkList;
int main()
{
int n, i, a;
LNode *p, *q;
LinkList L = (LinkList)malloc(sizeof(LinkList));//开辟头结点
LinkList nl = (LinkList)malloc(sizeof(LinkList));//新图书结点
L->next = NULL;//指针初始化
nl->next = NULL;
scanf_s("%d", &n);
q = L;
for (i = 1;i <= n;i++)
{
p = (LNode *)malloc(sizeof(LNode));//开辟首元结点及新结点
p->next = NULL;
scanf_s("%s %s %f", p->no, 20, p->name, 50, &p->price);
q->next = p;
q = p;
}
scanf_s("%d", &i);
scanf_s("%s %s %f", nl->no, 20, nl->name, 50, &nl->price);
printf("\n");
if (i<1 || i>n + 1)
printf("Sorry,this location is illegal.\n");
else
{
p = L;
for (a = 1;a < i;a++)
p = p->next;//把p定位到i位置的前一个结点
nl->next = p->next;
p->next = nl;
p = L->next;
for (a = 1;a <= n + 1;a++)
{
printf("%s %s %.2f\n", p->no, p->name, p->price);
p = p->next;
}
}
system("PAUSE");
return 0;
}