From cppreference.com
This header was originally in the C standard library as
.
This header is part of the
library.
Functions
checks if a character is alphanumeric
(function)
checks if a character is alphabetic
(function)
checks if a character is lowercase
(function)
checks if a character is an uppercase character
(function)
checks if a character is a digit
(function)
checks if a character is a hexadecimal character
(function)
checks if a character is a control character
(function)
checks if a character is a graphical character
(function)
checks if a character is a space character
(function)
(C++11)
checks if a character is a blank character
(function)
checks if a character is a printing character
(function)
checks if a character is a punctuation character
(function)
converts a character to lowercase
(function)
converts a character to uppercase
(function)
Synopsis
namespacestd{intisalnum(intc);intisalpha(intc);intisblank(intc);intiscntrl(intc);intisdigit(intc);intisgraph(intc);intislower(intc);intisprint(intc);intispunct(intc);intisspace(intc);intisupper(intc);intisxdigit(intc);inttolower(intc);inttoupper(intc);}