inttypes.h(3head) [centos man page]
inttypes.h(3HEAD) Headers inttypes.h(3HEAD) NAME
inttypes.h, inttypes - fixed size integer types SYNOPSIS
#include <inttypes.h> DESCRIPTION
The <inttypes.h> header includes the <stdint.h> header. The <inttypes.h> header includes a definition of the following type: imaxdiv_t structure type that is the type of the value returned by the imaxdiv() function. The following macros are 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 must be defined. The cor- responding fscanf() and fwscanf() macros must be defined as well, unless the implementation does not have a suitable modifier for the type. USAGE
The purpose of <inttypes.h> is to provide a set of integer types whose definitions are consistent across machines and independent of oper- ating systems and other implementation idiosyncrasies. It defines, with a 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 greatly increases the porta- bility of applications across platforms. EXAMPLES
Example 1: Use of Macro The following code uses one of the macros available through <inttypes.h>. #include <inttypes.h> #include <wchar.h> int main(void) { uintmax_t i = UINTMAX_MAX; // This type always exists. wprintf("The largest integer value is %020" PRIxMAX, " ", i); return 0; } ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
imaxdiv(3C), attributes(5), standards(5) SunOS 5.10 10 Sep 2004 inttypes.h(3HEAD)
Check Out this Related Man Page
STDINT(3) BSD Library Functions Manual STDINT(3) NAME
stdint -- standard integer types SYNOPSIS
#include <stdint.h> DESCRIPTION
The <stdint.h> header provides source-portable integer types of a specific size, smallest memory footprint with a minimum size, fastest access speed with a minimum size, largest integer size, and those capable of storing pointers. The types int8_t, int16_t, int32_t, and int64_t provide a signed integer type of width 8, 16, 32, or 64 bits, respectively. The types uint8_t, uint16_t, uint32_t, and uint64_t provide an unsigned integer type of width 8, 16, 32, or 64 bits, respectively. These integer types should be used when a specific size is required. The types int_fast8_t, int_fast16_t, int_fast32_t, and int_fast64_t provide the fastest signed integer type with a width of at least 8, 16, 32, or 64 bits, respectively. The types uint_fast8_t, uint_fast16_t, uint_fast32_t, and uint_fast64_t provide the fastest unsigned integer type with a width of at least 8, 16, 32, or 64 bits, respectively. These types should be used when access speed is paramount, and when a specific size is not required. The types int_least8_t, int_least16_t, int_least32_t, and int_least64_t provide the smallest memory footprint signed integer type with a width of at least 8, 16, 32, or 64 bits, respectively. The types uint_least8_t, uint_least16_t, uint_least32_t, and uint_least64_t provide the smallest memory footprint unsigned integer type with a width of at least 8, 16, 32, or 64 bits, respectively. These types should be used when memory storage is of concern, and when a specific size is not required. The type intmax_t provides a signed integer type large enough to hold any other signed integer. The type uintmax_t provides an unsigned integer type large enough to hold any other unsigned integer. These types are generally the largest signed and unsigned integer types avail- able on a specific architecture. The type intptr_t provides a signed integer type with the ability to hold a pointer to void, that can later be converted back to a pointer to void. The type uintptr_t provides an unsigned integer type with the ability to hold a pointer to void, that can later be converted back to a pointer to void. SEE ALSO
inttypes(3), limits(3), stdbool(3), unistd(3) STANDARDS
The <stdint.h> header conforms to ISO/IEC 9899:1999 (``ISO C99'') and IEEE Std 1003.1-2001 (``POSIX.1''). HISTORY
The <stdint.h> header was first introduced in NetBSD 1.6. BSD
August 9, 2011 BSD