CS50 Week1 C

Command line interface 命令行

操作系统
- Unix
  - MacOS
- Linux
  - Ubuntu, Centos, Debian
- Windows
  - WSL https://learn.microsoft.com/en-us/windows/wsl/install
Terminal vs Shell
- iTerm2
- Zsh (Z Shell)
  - https://ohmyz.sh/
常用命令
- mkdir make directory
- ls list
- cd change directory
  - 相对路径、绝对路径
- cp copy
- mv move
- rm remove
- rmdir remove directory
- clear clear
- man manual
快捷使用
- ctrl+l
- ctrl+a
- ctrl+e
- ctrl+u

VSCode

https://code.visualstudio.com/

Text editor vs IDE (Integrated development environment)
- JetBrains: GoLand, IntelliJ IDEA, PyCharm
- SublimeText
- Atom
Language server
- https://code.visualstudio.com/api/language-extensions/language-server-extension-guide
主题、插件
搜索
快捷键
- Command/Ctrl + shift + p 命令
- Command/Ctrl + B 文件管理器
- Ctrl + ` 内置终端
CS50 lib
- https://github.com/cs50/libcs50

课程内容

human → source code → compiler → machine code

correctness, design, style

#include <stdio.h>

int main(void)
{
    printf("hello, world\n");
}

make, clang, gcc
分号;
\n
header files - libraries
https://manual.cs50.io/
Data types
- char
- double
- float
- int
- long
- bool? C99
- string ?
  
  Using a string in CS50 library
format code
- %c %s %i %f %.2f
%%
= assignment
== equal
++ +=
% 求余、取模
Logical Operators
- ==
- !=
- !
- ||
- &&
Conditionals
- If
- If … else …
- If … else if … else …
- switch…case…
- ?:
Loop
- while
- for
- do…while…
Magic Numbers
- #define
Overflow
- 千年虫
- 2038-01-19
type casting
推荐书 <The C Programming Language>