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# Standard library header <cctype>

From cppreference.com
< cpp‎ | header

This header was originally in the C standard library as `<ctype.h>`.

This header is part of the null-terminated byte strings library.

### Functions
isalnum | checks if a character is alphanumeric (function) [edit]
isalpha | checks if a character is alphabetic (function) [edit]
islower | checks if a character is lowercase (function) [edit]
isupper | checks if a character is an uppercase character (function) [edit]
isdigit | checks if a character is a digit (function) [edit]
isxdigit | checks if a character is a hexadecimal character (function) [edit]
iscntrl | checks if a character is a control character (function) [edit]
isgraph | checks if a character is a graphical character (function) [edit]
isspace | checks if a character is a space character (function) [edit]
isblank (C++11) | checks if a character is a blank character (function) [edit]
isprint | checks if a character is a printing character (function) [edit]
ispunct | checks if a character is a punctuation character (function) [edit]
tolower | converts a character to lowercase (function) [edit]
toupper | converts a character to uppercase (function) [edit]

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