Learn C Programming vs PinTag

Learn C programming from beginner fundamentals to advanced concepts, then write and run supported C code offline on iPhone and iPad. C Language Assistant combines a structured C course, an on-device code editor, guided exercises, quizzes, and instant output in one focused study app. Follow 42 step-by-step chapters and 36 hands-on labs covering syntax, variables, loops, arrays, strings, functions, pointers, data structures, recursion, algorithms, debugging, and modular design. No account is required. Lessons, projects, editing, and bounded local code execution work without an internet connection; the App Store is contacted only for purchase and restore. Code Workspace • Create and manage C code projects saved on the device • Edit multiple .c source files and set virtual standard input • View console output, exit status and diagnostics with line and column positions • Import or export source files explicitly selected by the user through the system interface • View the editor and console side by side on iPad Structured Lessons and Exercises 42 chapter lessons start from the first program and cover variables, types, operators, input/output, branching, loops, arrays, strings, functions, pointers, structures, dynamic memory, recursion, algorithms, testing, debugging and modular design. Each chapter includes explanations, example code, interactive diagrams, execution tracing, hands-on tasks and quizzes. 36 code labs cover syntax, arrays, strings, functions, sorting, searching, recursion and base conversion, and provide steps, starter code, sample input/output, tests, hints, common mistakes and advanced challenges. All lessons and labs are included with the app and do not rely on online web pages. Safe Local Interpreted Execution User source code is lexically analyzed, parsed and executed in a restricted manner by the app’s built-in engine. It does not generate or load ARM64 instructions, Mach-O, object files or dynamic libraries, does not use JIT, and does not upload code to a server. Execution is bounded by limits on instruction count, call depth, input volume and output volume. C Language Assistant is not Clang, GCC or a complete ISO C toolchain. The current interpreter does not perform arbitrary memory access, full struct and union semantics, malloc/free, multi-dimensional arrays, a full preprocessor, real file I/O, networking, processes or system commands. Lessons flag advanced topics that require further experimentation with a desktop standard C toolchain. Privacy and Purchases No account is required. The app does not integrate advertising or third-party analytics SDKs and does not request tracking permissions. Code, projects, learning records, settings and free usage counts are saved only within the app container by default; exercise code cannot access device files, the network, other app data or iOS APIs. The first 20 code runs and the first 10 lesson detail views are free. The permanent unlock is a one-time non-consumable purchase, not a subscription and does not auto-renew; after purchase, you can run code and open lessons without limits, and Restore Purchases is supported. The price and currency are provided by the App Store based on the user’s region.

PinTag - 用标签管理一切重要信息 为什么选择 PinTag？ 在信息爆炸的时代，我们每天都要记录和管理大量的个人信息：账号密码、证件资料、工作笔记、生活清单、网址书签......传统的笔记应用往往 杂乱无章，查找困难。 PinTag 创新性地采用「标签驱动」的管理方式，让你可以用多个标签为每条信息打标记，实现灵活的多维度分类，快速找到所需内容。 核心功能 【智能标签系统】 • 为每条信息添加多个标签 • 通过标签快速筛选和查找 • 免费版提供 5 个标签，Pro 版无限制 【多种内容类型】 • 文本笔记：记录重要信息和想法 • 图片附件：保存证件照片、截图等 • 网址链接：收藏有用的网页 • 混合内容：一条信息可同时包含文本、图片、链接等 【快速分享保存】 • 从 Safari、照片等 App 直接分享到 PinTag • 一键保存网页、图片、文本 • 自动提取分享内容，智能填充 • 添加标签和描述，方便后续查找 【隐私安全保护】 • 支持 Face ID / Touch ID 生物识别锁定 • 自定义自动锁定时间 • 所有数据仅存储在你的设备和 iCloud • 我们不会收集任何个人信息 【iCloud 同步】 • 自动同步到你的所有 Apple 设备 • iPhone、iPad 数据实时保持一致 • 本地优先存储，离线也能查看 • 隐私安全，数据完全由你控制 【优雅的使用体验】 • 简洁直观的界面设计 • 流畅的动画效果 • 多语言支持（中文、英文、日文） 使用场景 【工作学习】 • 项目笔记和任务清单 • 会议记录和重要文档 • 技术文章和学习资料 • 工作账号和常用链接 【生活管理】 • 证件信息（身份证、银行卡等） • 家庭账号（水电煤、物业等） • 购物清单和优惠券 • 旅行计划和票据 【知识收藏】 • 有用的网页和文章 • 灵感和创意记录 • 菜谱和教程 • 个人日记和感悟 为什么不同于其他笔记应用？ 传统笔记应用：文件夹层级结构，信息只能放在一个位置 PinTag：标签化管理，一条信息可以属于多个分类 传统笔记应用：查找需要记住文件夹路径 PinTag：通过标签组合，快速定位目标信息 传统笔记应用：功能复杂，学习成本高 PinTag：专注信息管理，简单易用 Pro 功能 升级 Pro 解锁更多强大功能： • 无限创建标签 • 无限保存信息 • 支持开发者持续更新 我们提供灵活的订阅方案： • 月度订阅：灵活试用 • 年度订阅：更优惠的价格 隐私承诺 • 所有数据仅存储在你的设备和个人 iCloud • 不会上传到第三方服务器 • 不收集任何个人信息和使用数据 • 完全离线可用 • 你可以随时删除所有数据 联系我们 如果你有任何问题、建议或反馈，欢迎通过以下方式联系： • 邮箱：yushouren123@gmail.com • 用户协议：https://utopian-spoon-4de.notion.site/PinTag-2c2fe33beecc8025aabbe0d3a48bf7d0 • 在 App 内的「设置 - 关于」中查看更多信息 感谢你选择 PinTag！让我们一起用标签管理好生活的每个重要细节。