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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);
Last modified 8mo ago