编程与软件工程icube-icps.unistra.fr编辑精选
《现代 C》免费书（PDF）
Modern C [pdf]
2015 — 2016，它一次次回到首页
黑点是上首页（≥ 50 分）的那次投稿，空心点是没冲上去的投稿，点越大分数越高。
导读
《Modern C》是 Jens Gustedt 编写的免费 C 语言教材（PDF），面向不同经验水平的读者分层组织，覆盖 C99/C11 的现代特性。作者曾参与 musl libc 的 C11 标准库开发，因此对语言标准有深入理解。
为什么经久不衰：它是少数系统讲解 C11 现代特性（如 static 数组参数、_Noreturn、_Alignas）的免费教材，对想更新过时 C 知识的老程序员尤其有价值。
HN 评论精选
对初学者来说内容太多太快，入门示例过于复杂
我很想喜欢这本书，但看了第一章只能想象学生的困惑。我支持分层的想法，但它试图覆盖太多内容、节奏太快。第 2 页就用复杂的 printf 格式串、数组和循环来演示，初学者会看得眼花。正确的入门方式应该是极简的例子：先解释 main 是入口点并返回成功或失败，再逐步引入变量、循环。
jackhack查看英文原文
I wish I could like this book, but after reviewing the first chapter I can only imagine the confusion of students. I support very much the idea of breaking the book into levels, but it attempts to cover far too much, far too quickly and I don't believe this book would be useful for those who are not already familiar with the language. I've been writing C since the late 1980s, moved to mostly C++ by the mid 90s, C# in the 2000s, and now I've come back to C. Most recently built some realtime components and drivers, having to drop back to C77. I mention this as I've taught many colleagues along the way and I'm sensitive to the places where beginners tend to get hung up with problems and I've come to anticipate many of the questions along the way. Let me take a moment to illustrate the base of the problems i see: "Too much, too fast." The best example is right on page 2: a program which demonstrates a complex printf format string, along with arrays and loops. I can't help but sarcastically ask "Are you sure that is how you want to introduce someone to the language?" A beginner's eyes will glaze over. Seriously, the way to introduce the language is simple examples. Explain the main is the entry point where all programs begin running, and that main returns it's success or failure to the operating system (or other program that called it). 3 lines of code. Then add a SIMPLE print, if you wish, or a variable declaration. Int. Float. char. again, it MUST be simple. Introduce loops. Then show how to move some functionality out of main into a subroutine/a new method/new function, how to call that function, and return results. Talk about header files, etc. From there, dive into the rest of the base language... talk up arrays, memory management, heap/stack, pointers, libraries, exceptions, etc. But this is only my experience, and I'm sure that it is different for others. Kind regards.
书中部分示例代码过于炫技，且有技术性错误
书里很多内容不错，但第二章就出现 for (size_t i = 9; i <= 9; --i) 这种例子，我不会让这行代码通过 code review。还有 isset[!!largeA[i]] += 1; 这种卖弄的写法，请不要鼓励初学者写这种代码。另外书中说无符号整数'最容易被优化'在 x86 上完全不成立——编译器恰恰利用有符号溢出的未定义行为来优化。
colanderman查看英文原文
While I like a lot of what's in here, for (size_t i = 9; i <= 9; --i) is a pretty terrible example to put in the second chapter. I would not let that line pass code review. There is no need or place for cutesy cleverness in C. EDIT: Ugh, just found this too: isset[!!largeA[i]] += 1; Not only is that confusingly cutesy, but largeA[i] is a double. Please DON'T write – or encourage beginners to write! – such smug code! EDIT2: In section 5 is the statement than unsigned integers "can be optimized best." This is flatly untrue on x86 and I suspect many other architectures. Compilers can and do take advantage of undefined signed overflow to optimize signed arithmetic; the same is not possible with unsigned arithmetic. See https://kristerw.blogspot.com/2016/02/how-undefined-signed-overflow-enables.html
即使是资深 C 程序员也能从书中学到 C11 新特性
我可能得为老程序员做一个'C 从 1980 年以来有什么变化'的页面。我已经从这本书学到了新东西：size_t strlen(char const string[static 1]); 和 int main(int argc, char* argv[argc+1]); 据说有助于防止传入空指针，并给分析器和优化器提供信息。C11 也值得一看，一些原本靠 gcc/clang 属性实现的东西已进入语言，如 _Noreturn、_Alignas、_Alignof 和 aligned_alloc()。
jws查看英文原文
I might have to make a What has changed in C since 1980 page for old programmers. I've tried to stay current, but I learned something from this book already: size_t strlen(char const string[static 1]); int main(int argc, char* argv[argc+1]); This allegedly helps prevent null pointers from being passed in, and presumably tells the analyzers and optimizers some things they should know. It's worth a look at C11 as well, some of what you might have used gcc or clang attributes for has climbed into the language, such as _Noreturn, _Alignas, _Alignof and their friend aligned_alloc(). Addendum: Well, you can pass in pointers that go to fewer elements, but you can't pass in an actual naked null.
作者有 musl libc 的 C11 标准库开发背景，专业性强
作者还参与了 musl 的开发——一个符合 C11 的现代标准库实现。
pawadu查看英文原文
The author has also been involved in development of "musl", a modern C11 compliant standard library implementation: http://www.musl-libc.org https://gustedt.wordpress.com/2014/10/14/musl-1-1-5-with-full-c11-library-support/
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