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

Side Effects: None.

Affected By: None.

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)

Notes: None.