GBDK 2020 Docs
API Documentation for GBDK 2020
ctype.h File Reference
#include <types.h>

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Functions

BOOLEAN isalpha (char c)
 
BOOLEAN isupper (char c)
 
BOOLEAN islower (char c)
 
BOOLEAN isdigit (char c)
 
BOOLEAN isspace (char c)
 
char toupper (char c)
 
char tolower (char c)
 

Detailed Description

Character type functions.

Function Documentation

◆ isalpha()

BOOLEAN isalpha ( char  c)

Returns TRUE if the character c is a letter (a-z, A-Z), otherwise FALSE

Parameters
cCharacter to test

◆ isupper()

BOOLEAN isupper ( char  c)

Returns TRUE if the character c is an uppercase letter (A-Z), otherwise FALSE

Parameters
cCharacter to test

◆ islower()

BOOLEAN islower ( char  c)

Returns TRUE if the character c is a lowercase letter (a-z), otherwise FALSE

Parameters
cCharacter to test

◆ isdigit()

BOOLEAN isdigit ( char  c)

Returns TRUE if the character c is a digit (0-9), otherwise FALSE

Parameters
cCharacter to test

◆ isspace()

BOOLEAN isspace ( char  c)

Returns TRUE if the character c is a space (' '), tab (\t), or newline (\n) character, otherwise FALSE

Parameters
cCharacter to test

◆ toupper()

char toupper ( char  c)

Returns uppercase version of character c if it is a letter (a-z), otherwise it returns the input value unchanged.

Parameters
cCharacter to test

◆ tolower()

char tolower ( char  c)

Returns lowercase version of character c if it is a letter (A-Z), otherwise it returns the input value unchanged.

Parameters
cCharacter to test