Declarations:
int isalnum(intcharacter);
int isalpha(intcharacter);
int iscntrl(intcharacter);
int isdigit(intcharacter);
int isgraph(intcharacter);
int islower(intcharacter);
int isprint(intcharacter);
int ispunct(intcharacter);
int isspace(intcharacter);
int isupper(intcharacter);
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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