ctype.c File Reference

Functions related to character handling. More...

Macros
#define	OFFSET   32
	Distance from a uppercase character to the correspondent lowercase in ASCII.

Functions
int	isdigit (int c)
	Check if the given value is a digit. More...
int	isalpha (int c)
	Check if the given value is a letter. More...
int	iscntrl (int c)
	Check if the given value is a control character. More...
int	isalnum (int c)
	Check if the given value is either a letter or a digit. More...
int	isxdigit (int c)
	Check if the given value is an hexadecimal digit. More...
int	islower (int c)
	Check if the given value is a lower case letter. More...
int	isupper (int c)
	Check if the given value is an upper case letter. More...
int	tolower (int c)
	Transforms the given value into a lower case letter. More...
int	toupper (int c)
	Transforms the given value into an upper case letter. More...
int	isspace (int c)
	Check if the given value is a whitespace. More...

Detailed Description

Functions related to character handling.

Copyright

(c) 2014-2024 This file is distributed under the MIT License. See LICENSE.md for details.

Function Documentation

isalnum()

int isalnum

(

int

c

)

Check if the given value is either a letter or a digit.

Parameters

c	The input character.

Returns

1 on success, 0 otherwise.

isalpha()

int isalpha

(

int

c

)

Check if the given value is a letter.

Parameters

c	The input character.

Returns

1 on success, 0 otherwise.

iscntrl()

int iscntrl

(

int

c

)

Check if the given value is a control character.

Parameters

c	The input character.

Returns

1 on success, 0 otherwise.

isdigit()

int isdigit

(

int

c

)

Check if the given value is a digit.

Parameters

c	The input character.

Returns

1 on success, 0 otherwise.

islower()

int islower

(

int

c

)

Check if the given value is a lower case letter.

Parameters

c	The input character.

Returns

1 on success, 0 otherwise.

isspace()

int isspace

(

int

c

)

Check if the given value is a whitespace.

Parameters

c	The input character.

Returns

1 on success, 0 otherwise.

isupper()

int isupper

(

int

c

)

Check if the given value is an upper case letter.

Parameters

c	The input character.

Returns

1 on success, 0 otherwise.

isxdigit()

int isxdigit

(

int

c

)

Check if the given value is an hexadecimal digit.

Parameters

c	The input character.

Returns

1 on success, 0 otherwise.

tolower()

int tolower

(

int

c

)

Transforms the given value into a lower case letter.

Parameters

c	The input letter.

Returns

The input letter turned into a lower case letter.

toupper()

int toupper

(

int

c

)

Transforms the given value into an upper case letter.

Parameters

c	The input letter.

Returns

The input letter turned into an upper case letter.