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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, Sec‐
        tion 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 fol‐
        lowing 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 inte‐
        ger  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 exam‐
        ple, 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  cor‐
        responding  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.
        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 type     
        def,  integer types of various sizes. Implementations are free to type     
        def them as ISO C standard integer types or extensions that  they  sup‐
        port. Consistent use of this header will greatly increase the portabil‐
        ity of applications across platforms.
 

RATIONALE

        The ISO/IEC 9899:1990 standard specified that the language should  sup‐
        port 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, respec‐
        tively. 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 stan‐
        dard 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 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 .