atoi(3)



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  at-
       tributes(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.

SEE ALSO
       atof(3), strtod(3), strtol(3), strtoul(3)

COLOPHON
       This page is part of release 5.07 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                               2020-04-11                           ATOI(3)

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