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
0 1 2 3 4 5 6 7 8 9
or any other locale-specific alphabetic character.
isalpha
int isalpha(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
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 alphabetic character.
iscntrl
int iscntrl(int c);
The function returns nonzero if c is any of:
BEL BS CR FF HT NL VT
or any other implementation-defined control character.
isdigit
int isdigit(int c);
The function returns nonzero if c is any of:
0 1 2 3 4 5 6 7 8 9
isgraph
int isgraph(int c);
The function returns nonzero if c is any character for which either isalnum or ispunct
returns nonzero.
islower
int islower(int c);
The function returns nonzero if c is any of: