ctype

The ctype library has functions to check if a character is part of a specific category of ASCII characters.

Functions

std::ctype::isdigit

Checks if the given character c is a digit between '0' and '9'

• c: The character to check
• return: True if c is part of this range, false otherwise

fn isdigit(char c);

std::ctype::isxdigit

Checks if the given character c is a hexadecimal digit between '0' and '9', A and F or a and f

• c: The character to check
• return: True if c is part of this range, false otherwise

fn isxdigit(char c);

std::ctype::isupper

Checks if the given character c is a upper case letter between 'A' and 'Z'

• c: The character to check
• return: True if c is part of this range, false otherwise

fn isupper(char c);

std::ctype::islower

Checks if the given character c is a lower case letter between 'a' and 'z'

• c: The character to check
• return: True if c is part of this range, false otherwise

fn islower(char c);

std::ctype::isalpha

Checks if the given character c is either a upper or lower case letter between 'A' and 'Z' or 'a' and 'z'

• c: The character to check
• return: True if c is part of this range, false otherwise

fn isalpha(char c);

std::ctype::isalnum

Checks if the given character c is a upper or lower case letter or a number

• c: The character to check
• return: True if c is part of this range, false otherwise

fn isalnum(char c);

std::ctype::isspace

Checks if the given character c is a space character

• c: The character to check
• return: True if c is part of this range, false otherwise

fn isspace(char c);

std::ctype::isblank

Checks if the given character c is a invisible character

• c: The character to check
• return: True if c is part of this range, false otherwise

fn isblank(char c);

std::ctype::isprint

Checks if the given character c has a printable glyph

• c: The character to check
• return: True if c is part of this range, false otherwise

fn isprint(char c);

std::ctype::iscntrl

Checks if the given character c is a control code

• c: The character to check
• return: True if c is part of this range, false otherwise

fn iscntrl(char c);

std::ctype::isgraph

Checks if the given character c has a visible glyph

• c: The character to check
• return: True if c is part of this range, false otherwise

fn isgraph(char c);

std::ctype::ispunct

Checks if the given character c is a punctuation character

• c: The character to check
• return: True if c is part of this range, false otherwise

fn ispunct(char c);