What’s the difference between \n
(newline) and \r
(carriage return)?
In particular, are there any practical differences between \n
and \r
? Are there places where one should be used instead of the other?
In terms of ascii code, it's 3 -- since they're 10 and 13 respectively;-).
But seriously, there are many:
\n
is the code for end-of-line, \r
means nothing special\n
is the standard escape sequence for end of line (translated to/from OS-specific sequences as needed)\r
was the code for end-of-line instead\r\n
, in this order\r\n
is the standard line-termination for text formats on the Internet\r
commands the carriage to go back leftwards until it hits the leftmost stop (a slow operation), \n
commands the roller to roll up one line (a much faster operation) -- that's the reason you always have \r
before \n
, so that the roller can move while the carriage is still going leftwards!-) Wikipedia has a more detailed explanation.\r
and \n
act similarly (except both in terms of the cursor, as there is no carriage or roller;-)In practice, in the modern context of writing to a text file, you should always use \n
(the underlying runtime will translate that if you're on a weird OS, e.g., Windows;-). The only reason to use \r
is if you're writing to a character terminal (or more likely a "console window" emulating it) and want the next line you write to overwrite the last one you just wrote (sometimes used for goofy "ascii animation" effects of e.g. progress bars) -- this is getting pretty obsolete in a world of GUIs, though;-).