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ctype.h - is.... Functions
Declarations:
int isalnum(int character);
int isalpha(int character);
int iscntrl(int character);
int isdigit(int character);
int isgraph(int character);
int islower(int character);
int isprint(int character);
int ispunct(int character);
int isspace(int character);
int isupper(int character);
int isxdigit(int character);
 
The is... functions test the given character and return a nonzero (true) result if it satisfies the following conditions. If not, then 0 (false) is returned.

Conditions:

isalnum a letter (A to Z or a to z) or a digit (0 to 9)
isalpha a letter (A to Z or a to z)
iscntrl any control character (0x00 to 0x1F or 0x7F)
isdigit a digit (0 to 9)
isgraph any printing character except for the space character (0x21 to 0x7E)
islower a lowercase letter (a to z)
isprint any printing character (0x20 to 0x7E)
ispunct any punctuation character (any printing character except for space character or isalnum)
isspace a whitespace character (space, tab, carriage return, new line, vertical tab, or formfeed)
isupper an uppercase letter (A to Z)
isxdigit a hexadecimal digit (0 to 9, A to F, or a to f)
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