编辑“︁C 语言双链表”︁（章节）

=== 案例：浏览器历史记录模拟 ===
<syntaxhighlight lang="c">
struct BrowserHistory {
    struct Node* current;
};

void visitPage(struct BrowserHistory* history, int pageId) {
    struct Node* newNode = createNode(pageId);
    if (history->current != NULL) {
        history->current->next = newNode;
        newNode->prev = history->current;
    }
    history->current = newNode;
}

void goBack(struct BrowserHistory* history) {
    if (history->current != NULL && history->current->prev != NULL) {
        history->current = history->current->prev;
        printf("返回页面: %d\n", history->current->data);
    } else {
        printf("无法返回\n");
    }
}

void goForward(struct BrowserHistory* history) {
    if (history->current != NULL && history->current->next != NULL) {
        history->current = history->current->next;
        printf("前进页面: %d\n", history->current->data);
    } else {
        printf("无法前进\n");
    }
}
</syntaxhighlight>