CTYPE(3) Library Functions Manual CTYPE(3)NAME
ctype, isalpha, isupper, islower, isdigit, isxdigit, isalnum, isspace, ispunct, isprint, isgraph, iscntrl, isascii, toupper, tolower,
toascii - character classification macros
SYNOPSIS
#include <ctype.h>
int isalpha(int c)
...
DESCRIPTION
These macros classify characters by table lookup. Each is a predicate returning nonzero for true, zero for false. Isascii and toascii are
defined on all integer values; the rest are defined only on the range of unsigned char and on the special value EOF (see stdio(3)).
isalpha c is a letter
isupper c is an upper case letter
islower c is a lower case letter
isdigit c is a digit
isxdigit c is a hex digit
isalnum c is an alphanumeric character
isspace c is a space, tab, carriage return, newline, vertical tab, or formfeed
ispunct c is a punctuation character (neither control nor alphanumeric)
isprint c is a printing character, code 040(8) (space) through 0176 (tilde)
isgraph c is a printing character, similar to isprint except false for space.
iscntrl c is a delete character (0177) or ordinary control character (less than 040).
isascii c is an ASCII character, code less than 0200
tolower c is converted to lower case. Return value is undefined if not isupper(c).
toupper c is converted to upper case. Return value is undefined if not islower(c).
toascii c is converted to be a valid ascii character.
SEE ALSO ascii(7)7th Edition May 12, 1986 CTYPE(3)
Check Out this Related Man Page
CTYPE(3) Library Functions Manual CTYPE(3)NAME
isalpha, isupper, islower, isdigit, isxdigit, isalnum, isspace, ispunct, isprint, isgraph, iscntrl, isascii, toupper, tolower, toascii -
character classification macros
SYNOPSIS
#include <ctype.h>
isalpha(c)
. . .
DESCRIPTION
These macros classify ASCII-coded integer values by table lookup. Each is a predicate returning nonzero for true, zero for false. Isascii
and toascii are defined on all integer values; the rest are defined only where isascii is true and on the single non-ASCII value EOF (see
stdio(3S)).
isalpha c is a letter
isupper c is an upper case letter
islower c is a lower case letter
isdigit c is a digit
isxdigit c is a hex digit
isalnum c is an alphanumeric character
isspace c is a space, tab, carriage return, newline, vertical tab, or formfeed
ispunct c is a punctuation character (neither control nor alphanumeric)
isprint c is a printing character, code 040(8) (space) through 0176 (tilde)
isgraph c is a printing character, similar to isprint except false for space.
iscntrl c is a delete character(0177) or ordinary control character (less than 040).
isascii c is an ASCII character, code less than 0200
tolower c is converted to lower case. Return value is undefined if not isupper(c).
toupper c is converted to upper case. Return value is undefined if not islower(c).
toascii c is converted to be a valid ascii character.
SEE ALSO ascii(7)7th Edition May 12, 1986 CTYPE(3)
Hello,
Does somebody know what is happening here? This piece of code should skip leading spaces (and others).
If isspace encounters a non space character, it doesn't return false.
If we analyze the " isspace(*cs_str);" in the debugger, it returns 0. If we check the value in b_space after... (4 Replies)
How can I grep for a certain letter that only shows on the 3rd letter or character.
ex:
ASGHDY
SHTYRD
SDTYRD
IGIKGD
I only want the TY part of the 3rd character
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THANKS (5 Replies)
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I have generate one file from shell script.
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why?
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Hi all,
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