C,单链表翻转函数

Posted 2020-10-31

struct ST_StackNode
{
int num;
datatype data;
struct ST_StackNode *pNext; //指针域
};
typedef struct ST_StackNode StackNode;

StackNode reverse(StackNode phead)
{
if (phead == NULL){ return NULL; }
if (phead->pNext == NULL) { return phead; }

StackNode* pre, *cur, *next;

cur = phead->pNext;
phead->pNext = NULL;
pre = phead;

while (cur != NULL)
{
    next = cur->pNext;
    cur->pNext = pre;
    pre = cur;
    cur = next;
}
phead = pre;
return phead;

}