Man Atoi en anglais
ATOI(3)                    Linux Programmer's Manual                   ATOI(3)



 

NAME


       atoi, atol, atoll, atoq - convert a string to an integer

 

SYNOPSIS


       #include 

       int atoi(const char *nptr);
       long atol(const char *nptr);
       long long atoll(const char *nptr);
       long long atoq(const char *nptr);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       atoll(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
       _ISOC99_SOURCE; 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, (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().

 

RETURN VALUE


       The converted value.

 

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 non-standard 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 func-
       tion in  until libc 5.4.44).  The atoll() function is present
       in glibc 2 since version 2.0.2, but not in libc4 or libc5.

 

SEE ALSO


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

 

COLOPHON


       This  page  is  part of release 3.05 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.



GNU                               2007-07-26                           ATOI(3)