全部问题

该代码在大多数情况下都有效，但是当读取小数部分中带有前导零的分数时，结果是错误的：1.01 变为 11/10 而不是 101/100。

运行tio

#include <cstdio>

int main()
{
  unsigned long long x, y, nom, den;

  scanf("%llu.%llu", &x, &(y=0));
  for (den=1; den<=y; den*=10);
  nom = x * den + y;
  
  printf("%llu / %llu\n", nom, den);

  return 0;
}

1.01

11 / 10

已应用以下标题样式

.header {
    position: relative;
    background-image: url(../img/main-picture.jpeg);
    background-size: cover;
    background-repeat: no-repeat; 
    background-position: center;
    min-height: 100vh;
    position: relative;
    border-radius: 20px;
    margin-bottom: 77px;
}

我知道我需要使用 :before，但我无法画出任何类似的东西，并且已经搜索了整个互联网。帮助

如果您创建一个函数，例如：

void SomeFunction(int* ptr){
    int** ptr3 {&ptr};
    std::cout << ptr3 << std::endl;
}

int main(){
    int num{4};
    int* ptr{&num};

    std::cout << ptr << std::endl;

    int** ptr2 {&ptr};

    std::cout << ptr2 << std::endl;
    SomeFunction(ptr);
}

当传递 ptr 指针作为参数时，其单元格会发生变化。即ptr值被复制？如果是这样，如果复制仍然发生，为什么这种传递数据的方法比按值传递更快？

大家好，最近开始学习Docker，在浏览器中打开容器页面时遇到了如下问题。

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Apache/2.4.61 (Debian) 服务器位于本地主机端口 8080

并且还在容器日志中得到了这个：
2024-08-21 21:03:12 172.18.0.1 - - [21/Aug/2024:18:03:12 +0000]“GET / HTTP/1.1”403 493“- " "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, 如 Gecko) Chrome/127.0.0.0 Safari/537.36" 2024-08-21 21:03:12 [8 月 21 日星期三 18:03: 12.937792 2024] [autoindex：错误] [pid 17：tid 17] [客户端172.18.0.1：44598] AH01276：无法提供目录/var/www/html/：找不到匹配的DirectoryIndex（index.php，index.html），和服务器生成的目录索引被Options指令禁止
从日志中可以清楚地看出，错误是由于找不到index.php和html文件而导致的，但是我到底应该在哪里指示这些文件的路径呢？
Dockerfile

# Используем официальный PHP образ с Apache
FROM php:8.3-apache
# Устанавливаем зависимости и расширения PHP
RUN apt-get update && apt-get install -y \
    libpng-dev \
    libjpeg-dev \
    libfreetype6-dev \
    libzip-dev \
    unzip \
    && docker-php-ext-configure gd --with-freetype --with-jpeg \
    && docker-php-ext-install gd \
    && docker-php-ext-install zip \
    && docker-php-ext-install pdo_mysql mysqli
# Устанавливаем Composer
COPY --from=composer:latest /usr/bin/composer /usr/bin/composer
# Копируем исходный код в контейнер
COPY . /var/www/html
# Указываем рабочий каталог
WORKDIR /var/www/html
# Устанавливаем зависимости Laravel
RUN composer install
# Копируем .env файл
COPY .env.example .env
# Выполняем миграции базы данных
RUN php artisan key:generate
# Открываем порт
EXPOSE 80
# Запускаем Apache
CMD ["apache2-foreground"]

docker-compose.yml

version: '3.8'

services:
  # Сервис для PHP с Apache
  web:
    image: php:8.3-apache
    ports:
      - "8080:80"  # Пробрасываем порт 80 контейнера на порт 8080 хоста
    volumes:
      - D:/OSPanel/domains/gallery:/var/www/html
    networks:
      - app-network

  # Сервис для MySQL
  db:
    image: mysql:8.0
    environment:
      - MYSQL_ALLOW_EMPTY_PASSWORD=yes
      - MYSQL_DATABASE=galleryDB
    volumes:
      - db_data:/var/lib/mysql
    networks:
      - app-network

networks:
  app-network:
    driver: bridge

volumes:
  db_data:

default.conf Apache 配置文件

ServerRoot "/usr/local/apache2"
Listen 80
ServerName localhost

DocumentRoot "/var/www/html/public"

<Directory "/var/www/html/public">
    AllowOverride All
    Require all granted
</Directory>

<FilesMatch \.php$>
    SetHandler application/x-httpd-php
</FilesMatch>

<IfModule dir_module>
    DirectoryIndex index.php index.html
</IfModule>


<VirtualHost *:80>
    ServerAdmin webmaster@localhost
    DocumentRoot /var/www/html/public

    <Directory /var/www/html/public>
        AllowOverride All
        Require all granted
    </Directory>

    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

ErrorLog /usr/local/apache2/logs/error_log
CustomLog /usr/local/apache2/logs/access_log common

您需要从某个列表填充 TreeView：

var paths = new List<string>
            {
                @"DD\flora\green_tree\tree_0",
                @"DD\flora\green_tree\tree_1",
                @"DD\flora\dead_tree\Dtree_2",
                @"DD\flora\green_tree\tree_3",
                @"DD\flora\green_tree\tree_4",
                @"DD\wall\wooden_wall\wall_0",
                @"DD\window\wooden_window\window_0",
                @"DD\wall\wooden_wall\wall_1",
                @"DD\wall\wooden_wall\wall_2",
                @"DD\flora\green_bush\bush_0",
                @"BD\flora\dead_bush\Dbush_1",
                @"BD\flora\green_bush\bush_1"
            };

我目前正在使用以下代码：

FillingTreeView(MyTreeView, paths, '\\');

private static void FillingTreeView(TreeView treeView, IEnumerable<string> paths, char separator)
{
    TreeViewItem? lastNode = null;
    string subPathAgg;
    foreach (string path in paths)
    {
        lastNode = null;
        subPathAgg = "";
        foreach (string subPath in path.Split(separator))
        {
            subPathAgg += subPath + separator;
            TreeViewItem? nodes = SearchTreeView(subPathAgg, treeView.Items);
            if (nodes == null)
            {
                if (lastNode == null)
                {
                    treeView.Items.Add(new TreeViewItem() { Header = subPath, Tag = subPathAgg });
                    lastNode = (TreeViewItem)treeView.Items[^1];
                }
                else
                {
                    lastNode.Items.Add(new TreeViewItem() { Header = subPath, Tag = subPathAgg });
                    lastNode = (TreeViewItem)lastNode.Items[^1];
                }
            }
            else
            {
                lastNode = nodes;
            }
        }
    }
}
private static TreeViewItem? SearchTreeView(string subPathAgg, ItemCollection Nodes)
{
    TreeViewItem? returnValue = null;
    foreach (TreeViewItem node in Nodes)
    {
        if (string.Equals(((HeaderedItemsControl)node).Tag.ToString(), subPathAgg) == true)
        {
            returnValue = node;
            return returnValue;
        }
        if (node.Items.Count > 0) returnValue = SearchTreeView(subPathAgg, node.Items);
    }
    return returnValue;
}

一切都几乎按其应有的方式进行，但有时结果是这样的：

如您所见，存在重复的“wooden_wall”路径，它们应该是同一节点。这是我第一次使用WPF，希望对您有所帮助。