ATOI的用法

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);

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 function in until libc 5.4.44).  The  atoll()  func-
       tion  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)