Character functions

ACSUtils implements functions from the C programming language's ctype.h. Only ASCII characters are supported.

Character classification

bool isalnum(int c) – returns true if the character is a letter or a digit.

bool isalpha(int c) – returns true if the character is a letter.

bool isblank(int c) – returns true if the character is blank.

bool iscntrl(int c) – returns true if the character is a control character.

bool isdigit(int c) – returns true if the character is a digit.

bool isgraph(int c) – returns true if the character has a graphical representation.

bool islower(int c) – returns true if the character is lowercase.

bool isprint(int c) – returns true if the character is printable. Inverse of iscntrl().

bool isprint(int c) – returns true if the character is a punctuation character.

bool isspace(int c) – returns true if the character whitespace.

bool isupper(int c) – returns true if the character is uppercase.

bool isxdigit(int c) – returns true if the character is a hexadecimal digit (0123456789abcdef).

ACSUtils additions:

bool isascii(int c) – returns true if the character is an ASCII character.

Character classification functions return false for all non-ASCII characters.

Case conversion

If the character is not a letter, these functions return the original character:

int tolower(int c) – returns the lowercase version of the character.

int toupper(int c) – returns the uppercase version of the character.

Non-ASCII characters are always returned without conversion.

String versions of the above functions

These functions return true if all characters in the string match a character classification function:

bool StrIsASCII(str s) – isascii

bool StrIsAlnum(str s) – isalnum

bool StrIsAlpha(str s) – isalpha

bool StrIsBlank(str s) – isblank

bool StrIsCntrl(str s) – iscntrl

bool StrIsDigit(str s) – isdigit

bool StrIsGraph(str s) – isgraph

bool StrIsLower(str s) – islower

bool StrIsPrint(str s) – isprint

bool StrIsSpace(str s) – isspace

bool StrIsUpper(str s) – isupper

bool StrIsXDigit(str s) – isxdigit

These functions make all characters in the string lowercase or uppercase:

str StrToLower(str s) – returns the string with all characters converted to lowercase.

str StrToUpper(str s) – returns the string with all characters converted to uppercase.