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ANSI Common Lisp  13 Characters 13.2 Dictionary of Characters
| 13.2.15 upper-case-p, lower-case-p, both-case-p |
Function |
- Syntax:
-
| upper-case-p character |  generalized-boolean |
| lower-case-p character | generalized-boolean |
| both-case-p character | generalized-boolean |
- Arguments and Values:
-
character - a character.
generalized-boolean - a generalized boolean.
- Description:
-
These functions test the case of a given character.
upper-case-p returns true if character is an uppercase character; otherwise, returns false.
lower-case-p returns true if character is a lowercase character; otherwise, returns false.
both-case-p returns true if character is a character with case; otherwise, returns false.
- Examples:
-
(upper-case-p #\A) true
(upper-case-p #\a) false
(both-case-p #\a) true
(both-case-p #\5) false
(lower-case-p #\5) false
(upper-case-p #\5) false
;; This next example presupposes an implementation
;; in which #\Bell is an implementation-defined character.
(lower-case-p #\Bell) false
- Exceptional Situations:
-
Should signal an error of type type-error if character is not a character.
- See Also:
-
char-upcase,
char-downcase,
Section 13.1.4.3 Characters With Case,
Section 13.1.10 Documentation of Implementation-Defined Scripts
- Allegro CL Implementation Details:
-
None.
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