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       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of
       this interface may differ (consult the corresponding Linux  manual  page  for  details  of
       Linux behavior), or the interface may not be implemented on Linux.


       inttypes.h — fixed size integer types


       #include <inttypes.h>


       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 POSIX.1‐2008, 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 define at least the following types:

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

       wchar_t     As described in <stddef.h>.

       The  <inttypes.h>  header  shall  define the following macros. 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

       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);

       The following sections are informative.


       #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  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,   through   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.


       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.


       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.



       The System Interfaces volume of POSIX.1‐2008, Section 2.2,  The  Compilation  Environment,
       imaxabs(), imaxdiv(), strtoimax(), wcstoimax()


       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2013 Edition, Standard for Information Technology  --  Portable  Operating  System
       Interface  (POSIX),  The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the
       Institute of Electrical and Electronics Engineers, Inc  and  The  Open  Group.   (This  is
       POSIX.1-2008  with  the  2013  Technical  Corrigendum  1  applied.)  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 .

       Any typographical or formatting errors that appear in this page are most  likely  to  have
       been  introduced  during  the conversion of the source files to man page format. To report
       such errors, see .