Name

Description

isalnum

test character as alphanumeric

isalpha

test character as alphabetic

iscntrl

test character as control character

isdigit

test character as decimal digit

isgraph

test character as graphics character

islower

test character as lowercase

isprint

test character as printing character

ispunct

test character as punctuation

isspace

test character as whitespace

isupper

test character as uppercase

isxdigit

test character as hexadecimal digit

tolower

convert character to lowercase

toupper

convert character to uppercase