Name
atoi, atol, atoll, atoq — convert a string to an integer
Synopsis
#include <stdlib.h>
int
atoi( |
const char *nptr); |
long
atol( |
const char *nptr); |
long long
atoll( |
const char *nptr); |
long long
atoq( |
const char *nptr); |
![[Note]](../stylesheet/note.png) |
Note | |||
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DESCRIPTION
The atoi() function converts
the initial portion of the string pointed to by nptr to int. The behavior is the same as
strtol(nptr, (char **) NULL, 10);
except that atoi() does not
detect errors.
The atol() and atoll() functions behave the same as
atoi(), except that they
convert the initial portion of the string to their return
type of long or long long. atoq()
is an obsolete name for atoll().
CONFORMING TO
SVr4, POSIX.1-2001, 4.3BSD, C99. C89 and POSIX.1-1996
include the functions atoi()
and atol() only. atoq() is a GNU extension.
NOTES
The nonstandard atoq()
function is not present in libc 4.6.27 or glibc 2, but is
present in libc5 and libc 4.7 (though only as an inline
function in <stdlib.h>
until libc 5.4.44). The atoll()
function is present in glibc 2 since version 2.0.2, but not
in libc4 or libc5.
COLOPHON
This page is part of release 3.33 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at http://man7.org/linux/man-pages/.
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Copyright 1993 David Metcalfe (davidprism.demon.co.uk) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. References consulted: Linux libc source code Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) 386BSD man pages Modified Mon Mar 29 22:39:41 1993, David Metcalfe Modified Sat Jul 24 21:38:42 1993, Rik Faith (faithcs.unc.edu) Modified Sun Dec 17 18:35:06 2000, Joseph S. Myers |