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atol(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 4.09 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/.



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