ctype h library: The ctype.h header file includes numerous C standard library functions that declares several functions used for classify and transform individual characters.
All functions of this library take a character as argument, we can either call individual character or their corresponding ASCII value(as int). All classification functions return non-zero value(true) if character satisfies the condition, otherwise zero(false).
Transformation functions takes a character as argument and returns a character after transforming it. The tolower and toupper are the only transformation functions of ctype.h header file.
List of ctype Library Functions
ctype.h functions: Click on function names below to see detailed description of functions.
|isalnum||It checks whether a character is an alphanumeric character or not|
|isalpha||It checks whether a character is an alphabet or not|
|iscntrl||It checks whether a character is control character or not|
|isdigit||It checks whether a character is decimal digit character or not|
|isgraph||It checks whether a character has graphical representation or not|
|islower||It checks whether a character is lowercase alphabet or not|
|isprint||It checks whether a character is printable character or not|
|ispunct||It checks whether a character is punctuation character or not|
|isspace||It checks whether a character is white-space character or not|
|isupper||It checks whether a character is uppercase alphabet or not|
|tolower||It converts an uppercase alphabet to a lowercase alphabet|
|toupper||It converts a lowercase alphabet to an uppercase alphabet|