c语言基础

https://hit-alibaba.github.io/interview/iOS/ObjC-Basic/

https://www.zybuluo.com/Sakura-W/note/230109  done

https://github.com/ursash/jisuanji-biancheng

https://www.cnblogs.com/kenshincui/p/3840294.html
https://www.cnblogs.com/kenshincui/p/3848442.html

https://cn.aliyun.com/jiaocheng/105924.html

https://cloud.tencent.com/developer/article/1052546

https://blog.csdn.net/baidu_35692628/article/details/71155506

https://blog.csdn.net/feitianxuxue/article/details/7334929

https://blog.csdn.net/abc8730866/article/details/55804453

https://www.kancloud.cn/digest/clearning/149689

http://chenliangjing.me/2017/04/06/Objective-C%20%E8%AF%AD%E8%A8%80%E5%9F%BA%E7%A1%80%EF%BC%88%E4%B8%80%E3%80%81%E5%9F%BA%E7%A1%80%E7%9F%A5%E8%AF%86%EF%BC%89/

https://nsl.cs.sfu.ca/teaching/08/300/essentialC.pdf

env:
https://repl.it/@iris_kk/CYu-Yan-Ji-Chu




http://www.gamersky.com/handbook/201508/656751.shtml

https://legacy.gitbook.com/book/wizardforcel/c-basic-tutorial/details