r and n difference code example

Example: difference \n \r

\n is the classic line_feed on Unix/Linux (his ascii is 10 in decimal and 0a in hexadecimal)
\r\n is the classic line_feed on Windows
\r is the classic line_feed on olds version of MacOs (pre-MacOsX version) (his ascii is 13 in decimal an 0d in hexadecimal)