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ATOI(3) Linux Programmer's Manual ATOI(3)
NAME
atoi, atol, atoll - 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);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
atoll():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
_POSIX_C_SOURCE >= 200112L;
or cc -std=c99
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, 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.
RETURN VALUE
The converted value.
ATTRIBUTES
Multithreading (see pthreads(7))
The atoi(), atol(), and atoll() functions are thread-safe with exceptions. These func‐
tions can be safely used in multithreaded applications, as long as setlocale(3) is not
called to change the locale during their execution.
CONFORMING TO
SVr4, POSIX.1-2001, 4.3BSD, C99. C89 and POSIX.1-1996 include the functions atoi() and
atol() only.
NOTES
Linux libc provided atoq() as an obsolete name for atoll(); atoq() is not provided by
glibc.
SEE ALSO
atof(3), strtod(3), strtol(3), strtoul(3)
COLOPHON
This page is part of release 3.74 of the Linux man-pages project. A description of the
project, information about reporting bugs, and the latest version of this page, can be
found at http://www.kernel.org/doc/man-pages/.
GNU 2014-08-19 ATOI(3)
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