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():
	   __ISOC99_SOURCE ||
	       || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

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
       For  an	explanation  of	 the  terms  used   in	 this	section,   see
       attributes(7).

       +------------------------+---------------+----------------+
       |Interface		| Attribute	| Value		 |
       +------------------------+---------------+----------------+
       |atoi(), atol(), atoll() | Thread safety | MT-Safe locale |
       +------------------------+---------------+----------------+
CONFORMING TO
       POSIX.1-2001,  POSIX.1-2008,  C99,  SVr4, 4.3BSD.  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 4.10 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
       https://www.kernel.org/doc/man-pages/.



GNU				  2016-03-15			       ATOI(3)