c语言快慢指针之找未知长度单链表中间结点的值并显示

快慢指针之找未知长度单链表中间结点的值并显示，希望下面的文章对大家有所帮助。

#include 
#include
#include
#define max 5
typedef struct cursor
{
int data;
struct cursor *next;
}cursor;
cursor *initlist();
void findlist(cursor head);
void showlist(cursor head);
void showlist(cursor head)
{
cursor *p;

p=head.next;

while(p!=null)
{
printf("%5d",p->data);
p=p->next;
}
printf("\n");
}
void findlist(cursor head)
{
cursor *mid;
cursor *fast;
cursor *p;
fast=head.next;
mid=head.next;
while(fast->next!=null)
{


if(fast->next->next!=null)
{
fast=fast->next->next;
mid=mid->next;
}
else
{
fast=fast->next;
}
}
printf("%d",mid->data);

}
cursor *initlist()
{
cursor *head=null;
cursor *p=null,*q=null;
int k=0;
head=(cursor *)(malloc(sizeof(cursor)));



while(k {
q=(cursor *)(malloc(sizeof(cursor)));
k++;
if(k==1)
{
head->next=q;
}
else
{
p->next=q;
}
p=q;
p->data=rand()%100+1;

}
p->next=null;


return head;
}
int main()
{
cursor *head=null;
srand(time(null));
head=initlist();

showlist(*head);
findlist(*head);
}