For a description of the notations used for numbers, see section 6.2.
- . + -
-
These are used in numbers, and may also occur anywhere in an identifier except
as the first character. A delimited plus or minus sign by itself is also an
identifier. A delimited period (not occurring within a number or identifier)
is used in the notation for pairs (section 6.3.2), and to indicate a
rest-parameter in a formal parameter list (section 4.1.4). A delimited
sequence of three successive periods is also an identifier.
- ( )
-
Parentheses are used for grouping and to notate lists (section 6.3.2).
- '
-
The single quote character is used to indicate literal data (section 4.1.2).
- `
-
The backquote character is used to indicate almost-constant data (section
4.2.6).
- , ,@
-
The character comma and the sequence comma at-sign are used in conjunction with
backquote (section 4.2.6).
- "
-
The double quote character is used to delimit strings (section 6.3.5).
- \
-
Backslash is used in the syntax for character constants (section 6.3.4) and as
an escape character within string constants (section 6.3.5).
- [ ] { } |
-
Left and right square brackets and curly braces and vertical bar are reserved
for possible future extensions to the language.
- #
-
Sharp sign is used for a variety of purposes depending on the character that
immediately follows it:
- #t #f
-
These are the boolean constants (section 6.3.1).
- #\
-
This introduces a character constant (section 6.3.4).
- #(
-
This introduces a vector constant (section 6.3.6). Vector constants are
terminated by ")".
- #e #i #b #o #d #x
-
These are used in the notation for numbers (section 6.2.4).