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)
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)
a silly question but is there a way to display individual ascii values
say if i type 65 it will display the letter instead?
thanks fo any help. (3 Replies)
I know that there exists a function that says whether a particular character is ascii or not (i.e, isascii), is there any similar function that can say whether a character is an extended ascii. If possible can i have the internal implementaation of both.
Thanks in advance. (2 Replies)
I am getting a character with a "question mark inside a box". Does anybody know what ascii character i.e. what ascii number would it be. When I copy it in word I get it but when I copy it in notepad it only gives a box. I need to replace that inside my sed command in .SH file so I need to type it... (4 Replies)
Hi All,
I require some help with the below:
I am trying to incriment the ascii value of a letter and then print it.
So basically "a" becomes "b" and "z" becomes "A".
Does anyone have any pointers?
Cheers,
Parks (10 Replies)
Hi,
I'm trying to acheive the following, I have a dat file in which i have several addresses, If the address starts with a single digit then i have to delete the line,
if it starts with 2 or more digits then i have to keep the line
Here is a sample of my file:
377 CARRER DE LA... (5 Replies)