关于C#：链接列表中的节点交换

Node Swapping in Linked List

我是C的新手，我尝试使用链表交换两个节点。不知道怎么了。它给了我一个错误的说法

"temp" is undeclared.

另外，我可以在这段代码中更改什么来交换char和int呢？

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struct lnode {
int some_line;
int count;
char* some_word;
struct lnode* next;
};

void swapNodes(struct lnode** head, struct lnode* n1, struct lnode* n2);

int main()
{

struct lnode* head = NULL;
struct lnode* node0 = newCharNode(&head,"this is");
struct lnode* node1 = newCharNode(&head,"programming");
swapNodes(&head,node0,node1);
getchar();
return 0;
}

void swapNodes(struct lnode** head, struct lnode* n1, struct lnode* n2)
{
struct lnode* current = (*head);
struct lnode* temp;

while((current != NULL) && (current->next != NULL))
{
temp->some_word = n1->some_word;
n1->some_word = n2->some_word;
n2->some_word = temp->some_word;
}
printf("%s %s",n1,n2);
current = (current->next)->next;
}

struct lnode* newCharNode(struct lnode** head, char* myword) {
struct lnode* new_node = (struct lnode*) malloc(sizeof(struct lnode));
new_node ->some_word = myword;
new_node ->next = (*head);
(*head) = new_node;
}