upper-case-p, lower-case-p, both-case-p [Function]

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::

@xref{char-upcase; char-downcase} , char-downcase, section Characters With Case, section Documentation of Implementation-Defined Scripts

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