刚刚学编程 修改问题，用c语言基础的就行

Question

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
typedef struct SPB
{
int seller_num;
int fit_num;
int building_num;
int count;
int update;
struct SPB *next;
struct SPB *data;
}ListNode,*LinkList;
int main()
{
struct SPB *head = (struct SPB *)malloc (sizeof(struct SPB));
if (head == NULL)
{ printf("分配失败，程序结束");
exit(0);
}
head->next = NULL;
struct SPB p;
p = head;
for (int i = 0; i < 4; i++)
{
struct SPB *s = (struct SPB *)malloc(sizeof (struct SPB));
p->next = s;
s->next = NULL;
p = s;
}//菜单
printf("MUNU\n");
printf("add data--------1\n");
printf("delete data------2\n");
printf("update data------3\n");
printf("exit -----------4a\n");
printf("******************\n\n");
int ch;
printf("请输入你的选择");
scanf("%d", &ch);
while (ch != 4)
{ if (ch == 1)
{ struct SPB *pf, pb;
int i,
head = NULL;
for (i = 0; i < 2; i++)
{
pb = (struct SPB *) malloc(sizeof (struct SPB));
if (NULL == pb)
{ printf("malloc fail!\n");
return head;
}
}
printf("seller's number: ");
printf("fit's number: ");
printf("builiding's number: ");
printf("count's number: ");
scanf("%d,%d,%d,%d", pb->seller_num, pb->fit_num, pb->building_num, pb->count);
}
if (ch == 2) {
int i;
ListNodeL;
int j = 1;
struct SPB *q, *p;
p=L; //没有初始化啊，后面怎么能用呢
printf("请输入需删除的项");
scanf("%d", i);
while (p->next && j < i)
{
p = p->next;
j++;
}
if (p->next == NULL & j > i)
q = (p).next;
(p).next = p->next->next;
free(q);
{
if (ch == 3)
{
ListNodeL;
if(L->next==NULL)
return -1;
int j=1,i;
scanf("%d",&i);
printf("请输入你要修改的数据 1,销售商号码 2,配件号 3,工地号 4,数量");
ListNodep=L->next;
while(p&&j<i)
{p=p->next;j++;}
if(j==i)
{
printf("找到该数据，请输入修改后的值：");
scanf("%d", LinkList->update);
p->data=LinkList->update;
}
}
}
}

Answer 1

```c

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
typedef struct SPB
{
int seller_num;
int date;
int fit_num;
int building_num;
int count;
int update;
struct SPB *next;
struct SPB *data;
}ListNode,*LinkList;
LinkList p,q;
int main()
{
struct SPB *head = (struct SPB *)malloc (sizeof(struct SPB));
if (head == NULL)
{ printf("分配失败，程序结束");
exit(0);
}
//LinkList p;
head->next = NULL;
struct SPBp;
p = head;
for (int i = 0; i < 4; i++)
{
struct SPB *s = (struct SPB *)malloc(sizeof (struct SPB));
p->next = s;
s->next = NULL;
p = s;
}//菜单
printf("MUNU\n");
printf("add data--------1\n");
printf("delete data------2\n");
printf("update data------3\n");
printf("exit -----------4a\n");
printf("******************\n\n");
int ch;
printf("请输入你的选择");
scanf("%d", &ch);
while (ch != 4)
{
if (ch == 1)
{ LinkList pf,pb;
int i,
head = NULL;
for (i = 0; i < 2; i++)
{
pb = (struct SPB *) malloc(sizeof (struct SPB));
if (NULL == pb)
{ printf("malloc fail!\n");
return head;
}
}
printf("seller's number: ");
printf("fit's number: ");
printf("builiding's number: ");
printf("count's number: ");
scanf("%d,%d,%d,%d", pb->seller_num, pb->fit_num, pb->building_num, pb->count);
}
if (ch == 2) {
int i;
LinkList L;
int j = 1;
//struct SPB *q, *p;
p=L; //没有初始化啊，后面怎么能用呢
printf("请输入需删除的项");
scanf("%d", i);
while (p->next && j < i)
{
p = p->next;
j++;
}

if (p->next == NULL & j > i)
q = (p)->next;
(p)->next = p->next->next;
free(q);

}
if (ch == 3)
{
LinkList L;
if(L->next==NULL)
return -1;
int j=1,i;
scanf("%d",&i);
printf("请输入你要修改的数据 1,销售商号码 2,配件号 3,工地号 4,数量");
//ListNodep=L->next;找不到ListNodep是干什么的
while(p&&j<i)
{p=p->next;j++;}
if(j==i)
{
printf("找到该数据，请输入修改后的值：");
scanf("%d", L->data );
p->data=L->data ;
}
}
}
}

```不知道是不是你想要的结果，反正错误是没有了，还有提醒一下，打代码的大括号要注意一下啊，都找不到在哪里是一段，尽量把操作放函数里头，没有的变量你咋调用啊！如果有帮助的话，请采纳一下谢谢