### 1.1.3 Scheme simple data types

The most basic concept in a language is data typing: numbers, character strings, lists, etc. Here is a list of simple Scheme data types that are often used with LilyPond.

Booleans

  Boolean values are True or False. The Scheme for True is `#t` and False is `#f`.

Numbers

  Numbers are entered in the standard fashion, `1` is the (integer) number one, while `-1.5` is a floating point number (a non-integer number).

Strings

  Strings are enclosed in double quotes:

  >     "this is a string"

  Strings may span several lines:

  >     "this
  >     is
  >     a string"

  and the newline characters at the end of each line will be included in the string.

  Newline characters can also be added by including `\n` in the string.

  >     "this\nis a\nmultiline string"

  Quotation marks and backslashes are added to strings by preceding them with a backslash. The string `\a said "b"` is entered as

  >     "\\a said \"b\""

There are additional Scheme data types that are not discussed here. For a complete listing see the Guile reference guide, http://www.gnu.org/software/guile/manual/html_node/Simple-Data-Types.html.

其他语言：deutsch, español, français。
About automatic language selection.

#### LilyPond — Extending v2.18.2 (稳定分支).