Why does io:format support ~n when \n does the same thing?

问题

These two give identical output:

1> io:format("Hello, world!~n").
Hello, world!
ok
2> io:format("Hello, world!\n").
Hello, world!
ok

Why does io:format support ~n when \n does the same thing? Are there any differences?

回答1:

According to "Programming Erlang", ~n outputs the platform-specific new line sequence (\n on Unix, \r\n on Windows, etc.). I think \n just writes the \n character, but am not sure.

回答2:

According to io document, The general format of a control sequence is ~F.P.PadModC. So the format must begin with ~, and character n is one of the control sequences with the definition Writes a new line. \n is not a format.

来源：https://stackoverflow.com/questions/13215033/why-does-ioformat-support-n-when-n-does-the-same-thing