Name

digittoint, isalnum, isalpha, isascii, isblank, iscntrl, isdigit, isgraph, ishexnumber, isideogram, islower, isnumber, isphonogram, isprint, ispunct, isrune, isspace, isspecial, isupper, isxdigit, toascii, tolower, toupper - character classification macros

Library

Standard C Library (libc, -lc)

Synopsis

#include <ctype.h>

int
digittoint(int c);

int
isalnum(int c);

int
isalpha(int c);

int
isascii(int c);

int
iscntrl(int c);

int
isdigit(int c);

int
isgraph(int c);

int
ishexnumber(int c);

int
isideogram(int c);

int
islower(int c);

int
isnumber(int c);

int
isphonogram(int c);

int
isspecial(int c);

int
isprint(int c);

int
ispunct(int c);

int
isrune(int c);

int
isspace(int c);

int
isupper(int c);

int
isxdigit(int c);

int
toascii(int c);

int
tolower(int c);

int
toupper(int c);

Description

The above functions perform character tests and conversions on the integer c. They are available as macros, defined in the include file <ctype.h>, or as true functions in the C library. See the specific manual pages for more information.

See Also

digittoint(3) , isalnum(3) , isalpha(3) , isascii(3) , isblank(3) , iscntrl(3) , isdigit(3) , isgraph(3) , islower(3) , isprint(3) , ispunct(3) , isspace(3) , isupper(3) , isxdigit(3) , toascii(3) , tolower(3) , toupper(3) , ascii(7)

Standards

These functions, except for digittoint(), isascii(), ishexnumber(), isideogram(), isnumber(), isphonogram(), isrune(), isspecial() and toascii(), conform to ISO/IEC 9899:1990 (``ISO C89'').

Table of Contents

• Name
• Library
• Synopsis
• Description
• See Also
• Standards