cctype

Function	Description
isalnum	checks if char is alphanumeric
isalpha	checks if char is alphabetic
isascii	checks if char is an ascii char
isblank	checks if char is blank
iscntrl	checks if char is a control char
isdigit	checks if char is a digit
isgraph	checks if char is printing character except space (' ')
islower	checks if char is lowercase
isprint	checks if char is printable
ispunct	checks if char is a punctuation char
isspace	checks if char is space
isupper	checks if char is uppercase
isxdigit	checks if char is hexadecimal

on the occasion of the current invasion of Russia in Ukraine