Summary of document level symbols under different systems

One 、 Backslashes and slashes at the file level

Windows File level with backslash \ Express , and Linux、Unix Use slash /.

Why do the same thing have two different representations ？ answer ： Because in the early days Windows Of DOS Yes, it is / Said parameters , In order to distinguish between , The backslash is used \ Said file . Today, Window The file address bar can be mixed at the same time \ and /, The system will convert it into \; But not all applications support such automatic conversion behavior （cmd No, but powershell Then you can ）.

Linux From the beginning / As a system level symbol , Use - and -- Represents a command line parameter .

Two 、 File path in programming

The operating system makes it easy for us to get the file path , Usually in ：

• Command acquisition of terminal （Windows,powershell pwd,cmd cd,Linux pwd）
• Explorer

Linux、Unix Next , Copy and paste into the program for use , Hierarchical symbols are consistent with the programming language .

Windows Copy all file paths under will be escape characters \, This has a special meaning in programming languages （ escape ）.

You can choose the following methods , The third one requires compiler support （C++11）：

• Manually modify \ by /
  

• Repeat the escape character \ become \\
  

• Native character escape （R(“…”)）

R Processing is that none of the characters in the high-speed compiler are escape characters , The compiler can continue to process .