atoi

ATOI(3)                    Linux Programmer's Manual                   ATOI(3)



NAME
       atoi, atol, atoll, atoq - 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);
       long long atoq(const char *nptr);

DESCRIPTION
       The  atoi() function converts the initial portion of the string pointed
       to by nptr to int.  The behaviour 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
       SVID 3, POSIX.1, BSD 4.3, ISO/IEC 9899.  ISO/IEC  9899:1990  (C89)  and
       POSIX.1  (1996  edition)  include the functions atoi() and atol() only;
       C99 adds the function atoll().

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 <stdlib.h> 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)



GNU                               2000-12-17                           ATOI(3)