Question

c语言 链表问题求解，链表为什么创建不了哪里有错？

#include <stdio.h>
#include <stdlib.h>
//using namespace std;
struct node
{
int data;
struct node *next;
};

struct node *create();
//void show(struct node *head);

int main(){
struct node *head;
struct node *red;
head=create();
red=head;
printf("%d",head->data);
//show(head);
return 0;
}
struct node *create()
{

struct node *head=NULL;
struct node *ped=head;
struct node *ps;
int num;
//cout<<"please input some datas end with '\n'"<<endl;
//cin>>num;
while(1)
{
printf("please input some datas end with 0\n");
scanf("%d",&num);
if(num==0)
break;

ps=(struct node*)malloc(sizeof(struct node));// ps=struct node;
ps->data=num;
ps->next=NULL;
if(head==NULL)
head->next=ps;
else
{
ped->next=ps;
}
ped=ps;
}
return head;
}
有点乱，求告知链表创建函数的错误就好,,,,其实只要答这个就好head->next=ps改成head=ps

Answer 1

#include <stdio.h>
#include <stdlib.h>
//using namespace std;
struct node
{
int data;
struct node *next;
};

struct node *create();
//void show(struct node *head);

int main(){
struct node *head;
struct node *red;
head=create();
red=head;
printf("%d",head->next->data);//输出的只是头指针指向的内存的下一个地址里面的内存数据内容//（即为第一个ps里的数据）
//show(head);
return 0;
}
struct node *create()
{

struct node *head=(struct node*)malloc(sizeof(struct node));//您没有为head申请内存
struct node *ped=head;
struct node *ps;
int num;
head->next=NULL;
//cout<<"please input some datas end with '\n'"<<endl;
//cin>>num;
while(1)
{
printf("please input some datas end with 0\n");
scanf("%d",&num);
if(num==0)
break;

ps=(struct node*)malloc(sizeof(struct node));// ps=struct node;
ps->data=num;
ps->next=NULL;
if(head->next==NULL)
head->next=ps;//这边应该这样改
else
{
ped->next=ps;
}
ped=ps;
}
return head;
}

Answer 2

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

struct node
{
	int data;
	struct node *next;
};

struct node *create();
void show( struct node *head )
{
	struct node *p=head;
	while( p )
	{
		printf("%d->", p->data );
		p=p->next ;
	}
	printf("NULL\n");
}
int main(){
	struct node *head;
	head=create();
	show(head);
	return 0;
}
struct node *create()
{
	struct node *head=NULL;
	struct node *ped;
	struct node *ps;
	int num;
	
	while(1)
	{
		printf("please input some datas end with 0\n");
		scanf("%d",&num);
		if(num==0)
			break;
		
		ps=(struct node*)malloc(sizeof(struct node));
		ps->data=num;
		ps->next=NULL;
		if(head==NULL)
			head=ps;
		else
			ped->next=ps;
		ped=ps;
	}
	return head;
}

Answer 3

if(head==NULL)
{
head=ps;
ped=ps;
}
试一下，没运行过