Standard C++ Library Reference ISO/IEC (VERSION3)

a b c d e f g h i j k l m n o p q r s t u v w x y z
or any other locale-specific lowercase character.
isprint
int isprint(int c);
The function returns nonzero if c is space or a character for which isgraph returns nonzero.
ispunct
int ispunct(int c);
The function returns nonzero if c is any of:
! " # % & ' ( ) ; <
= > ? [ \ ] * + , -
. / : ^ _ { | } ~
or any other implementation-defined punctuation character.
isspace
int isspace(int c);
The function returns nonzero if c is any of:
CR FF HT NL VT space
or any other locale-specific space character.
isupper
int isupper(int c);
The function returns nonzero if c is any of:
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
or any other locale-specific uppercase character.
isxdigit
int isxdigit(int c);
The function returns nonzero if c is any of: