1.4.4 Characters
(alpha-char-p x) → t |
x : (characterp x) |
Determines whether x is an alphabetic character.
Examples: |
> (alpha-char-p #\a) |
't |
> (alpha-char-p #\3) |
'() |
Extracts the character at the nth (0-based) position in the string str.
(char< x y) → t |
x : (characterp x) |
y : (characterp y) |
Determines whether the character code of x is less than that of y.
(char<= x y) → t |
x : (characterp x) |
y : (characterp y) |
Determines whether the character code of x is less than or equal to that of y.
(char> x y) → t |
x : (characterp x) |
y : (characterp y) |
Determines whether the character code of x is greater than that of y.
(char>= x y) → t |
x : (characterp x) |
y : (characterp y) |
Determines whether the character code of x is greater than or equal to that of y.
(char-code char) → t |
char : (characterp char) |
Returns the numeric code for the given character.
(char-downcase char) → t |
char : (and (characterp char) (standard-char-p str)) |
Converts the given character to lowercase
Examples: |
> (char-downcase #\A) |
#\a |
> (char-downcase #\a) |
#\a |
(char-equal x y) → t |
x : (and (characterp x) (standard-char-p x)) |
y : (and (characterp y) (standard-char-p y)) |
Checks if the given characters are equal, ignoring to case.
Examples: |
> (char-equal #\a #\a) |
't |
> (char-equal #\A #\a) |
't |
(char-upcase char) → t |
char : (and (characterp char) (standard-char-p str)) |
Converts the given character to uppercase
Examples: |
> (char-upcase #\A) |
#\A |
> (char-upcase #\a) |
#\A |
(characterp x) → t |
x : t |
Examples: |
> (characterp #\a) |
't |
> (characterp "a") |
'() |
Converts the given number into its character equivalent.
(digit-char-p x) → t |
x : (characterp x) |
Determines whether the given character represents a numerical digit.
Examples: |
> (digit-char-p #\3) |
3 |
> (digit-char-p #\a) |
'() |
Converts the given number into its equivalent character in hex notation.
Examples: |
> (digit-to-char 7) |
#\7 |
> (digit-to-char 10) |
#\A |
> (digit-to-char 15) |
#\F |
(lower-case-p x) → t |
x : (and (characterp x) (standard-char-p x)) |
Determines if x is a lowercase alphabetic character.
Examples: |
> (lower-case-p #\a) |
't |
> (lower-case-p #\A) |
'() |
(standard-char-p x) → t |
x : (characterp x) |
Checks if the given character is a member of the *standard-chars*. This includes the standard punctuation and alphanumeric characters, along with #\newline and #\space.
Examples: |
> (standard-char-p #\a) |
't |
> (standard-char-p #\5) |
't |
> (standard-char-p #\tab) |
'() |
(upper-case-p x) → t |
x : (and (characterp x) (standard-char-p x)) |
Determines if x is an upper-case alphabetic character.
Examples: |
> (upper-case-p #\A) |
't |
> (upper-case-p #\a) |
'() |