TODO

https://news.ycombinator.com/item?id=22865357 : C 标准在hn 上的提问。 https://news.ycombinator.com/item?id=22888318 : 嵌入式的内容 http://nickdesaulniers.github.io/blog/2019/05/12/f-vs-f-void-in-c-vs-c-plus-plus/

https://github.com/rby90/project-based-tutorials-in-c https://github.com/angrave/SystemProgramming : C 语言教程，快速浏览，查漏补缺

好玩的东西

https://github.com/taylorconor/quinesnake : 我记得还有一个使用 printf 实现 xxoo 的游戏

You don’t know C

C Traps and pitfalls

1. int shall not has leading zero

   int a = 012;
   

2. token analyzer is greedy, which means nested commnet is invalid

   /**/*/ equals */ not nothing !
   

3. use typedef to simplify function pointer type

   typedef void (*FUN_PTR)(int a, int b);
   void handler(int & sum, FUN_PTR f);
   

4. operator priority
   1. logical < arithmetic
   2. shift < arithmetic shift > relation
5. ; ```c // after if and while if (flag); printf(“hello”)

if (flag) printf(“hello”)

5. Compute order : only `||` `&&` `?:` `,`
```c
i = 0;
while(i < n){
    y[i] = x[i++];
}
i ++ maybe calcauted before y[i] assigned, maybe after.

1. return value for main is important

2. getchar return int

   int main(){
    int c;
    while((c = getchar()) != EOF){
        putchar(c);
    }
    return 0;
   }
   

3. Linker
   1. use extern to declare there is a variable.
   2. define a variable : declare and allocate memory

C is not just C

C is os, compiler and arch.

Pointer and array

Pointer and array is not the same thing !

1. C only has one dimension array, high dimension are emulated !
2. Only two thing we can do to C array:
   1. get array size
   2. access the pointer pointing to begining of array

1. shorthand

   int b[10];
   c[0] = 12;
   0[c] = 12; // not recommended
   

2. As function parameter ,array will be transform to pointer automaticall. And this is the reason why both of pointer and array call pass to pointer parameter. ```c void func(int a[10][10]){

}

void func(int (*a)[10]){

}

But this kind of transformation is only appear in function parameter.
```c
extern char * hello;
extern char [] hello;

C 语言的额外审查

https://rules.sonarsource.com/c/

c 的一些库

https://github.com/attractivechaos/klib

整理的挺好的

https://devdocs.io/c/numeric/math/acosh

https://blogs.gentoo.org/mgorny/2024/09/23/overview-of-cross-architecture-portability-problems/

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