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NAME

       inttypes.h - fixed size integer types

SYNOPSIS

       #include <inttypes.h>

DESCRIPTION

       Some  of the functionality described on this reference page extends the
       ISO C standard. Applications shall define the appropriate feature  test
       macro  (see  the  System  Interfaces  volume  of  IEEE Std 1003.1-2001,
       Section 2.2, The Compilation Environment) to enable the  visibility  of
       these symbols in this header.

       The <inttypes.h> header shall include the <stdint.h> header.

       The  <inttypes.h>  header  shall  include  a definition of at least the
       following type:

       imaxdiv_t
              Structure type that is the type of the  value  returned  by  the
              imaxdiv() function.

       The  following  macros  shall  be  defined. Each expands to a character
       string literal containing a conversion specifier, possibly modified  by
       a  length  modifier,  suitable  for use within the format argument of a
       formatted  input/output  function  when  converting  the  corresponding
       integer  type.  These  macros  have  the general form of PRI (character
       string literals for the fprintf() and fwprintf() family  of  functions)
       or SCN (character string literals for the fscanf() and fwscanf() family
       of functions), followed by the conversion specifier, followed by a name
       corresponding  to  a similar type name in <stdint.h>. In these names, N
       represents the width of the  type  as  described  in  <stdint.h>.   For
       example,  PRIdFAST32  can be used in a format string to print the value
       of an integer of type int_fast32_t.

       The fprintf() macros for signed integers are:

                   PRIdN  PRIdLEASTN  PRIdFASTN  PRIdMAX  PRIdPTR
                   PRIiN  PRIiLEASTN  PRIiFASTN  PRIiMAX  PRIiPTR

       The fprintf() macros for unsigned integers are:

                   PRIoN  PRIoLEASTN  PRIoFASTN  PRIoMAX  PRIoPTR
                   PRIuN  PRIuLEASTN  PRIuFASTN  PRIuMAX  PRIuPTR
                   PRIxN  PRIxLEASTN  PRIxFASTN  PRIxMAX  PRIxPTR
                   PRIXN  PRIXLEASTN  PRIXFASTN  PRIXMAX  PRIXPTR

       The fscanf() macros for signed integers are:

                   SCNdN  SCNdLEASTN  SCNdFASTN  SCNdMAX  SCNdPTR
                   SCNiN  SCNiLEASTN  SCNiFASTN  SCNiMAX  SCNiPTR

       The fscanf() macros for unsigned integers are:

                   SCNoN  SCNoLEASTN  SCNoFASTN  SCNoMAX  SCNoPTR
                   SCNuN  SCNuLEASTN  SCNuFASTN  SCNuMAX  SCNuPTR
                   SCNxN  SCNxLEASTN  SCNxFASTN  SCNxMAX  SCNxPTR

       For each type that  the  implementation  provides  in  <stdint.h>,  the
       corresponding  fprintf() and fwprintf() macros shall be defined and the
       corresponding fscanf() and fwscanf() macros shall be defined unless the
       implementation does not have a suitable modifier for the type.

       The following shall be declared as functions and may also be defined as
       macros. Function prototypes shall be provided.

              intmax_t  imaxabs(intmax_t);
              imaxdiv_t imaxdiv(intmax_t, intmax_t);
              intmax_t  strtoimax(const char *restrict, char **restrict, int);
              uintmax_t strtoumax(const char *restrict, char **restrict, int);
              intmax_t  wcstoimax(const wchar_t *restrict, wchar_t **restrict, int);
              uintmax_t wcstoumax(const wchar_t *restrict, wchar_t **restrict, int);

EXAMPLES

              #include <inttypes.h>
              #include <wchar.h>
              int main(void)
              {
                  uintmax_t i = UINTMAX_MAX; // This type always exists.
                  wprintf(L"The largest integer value is %020"
                      PRIxMAX "\n", i);
                  return 0;
              }

       The following sections are informative.

APPLICATION USAGE

       The purpose of <inttypes.h> is to provide a set of integer types  whose
       definitions are consistent across machines and independent of operating
       systems and  other  implementation  idiosyncrasies.   It  defines,  via
       typedef,  integer  types  of various sizes. Implementations are free to
       typedef them as ISO C standard integer types or  extensions  that  they
       support.  Consistent  use  of  this  header  will  greatly increase the
       portability of applications across platforms.

RATIONALE

       The ISO/IEC 9899:1990  standard  specified  that  the  language  should
       support  four signed and unsigned integer data types- char, short, int,
       and long- but placed very little requirement on their size  other  than
       that  int and short be at least 16 bits and long be at least as long as
       int  and  not  smaller  than  32  bits.  For   16-bit   systems,   most
       implementations  assigned  8,  16, 16, and 32 bits to char, short, int,
       and long, respectively. For 32-bit systems,  the  common  practice  has
       been  to  assign 8, 16, 32, and 32 bits to these types. This difference
       in int size can create some problems for users  who  migrate  from  one
       system  to  another  which  assigns  different  sizes to integer types,
       because the ISO C standard integer promotion rule  can  produce  silent
       changes  unexpectedly.  The  need for defining an extended integer type
       increased with the introduction of 64-bit systems.

FUTURE DIRECTIONS

       Macro names beginning with PRI or SCN followed by any lowercase  letter
       or 'X' may be added to the macros defined in the <inttypes.h> header.

SEE ALSO

       The System Interfaces volume of IEEE Std 1003.1-2001, imaxdiv()

COPYRIGHT

       Portions  of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained  online
       at http://www.opengroup.org/unix/online.html .