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Home >
Electronics Tutorials >
C Language
Tutorial > ctype.h
- is.... Functions |
C Language Programming Library
Reference Guide
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ctype.h
- is.... Functions
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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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