stdint.h is a header file in the C standard library introduced in the C99 standard library section 7.18 to allow programmers to write more portable code by providing a set of typedefs that specify exact-width integer types, together with the defined minimum and maximum allowable values for each type, using macros. This header is particularly useful for embedded programming which often involves considerable manipulation of hardware specific I/O registers requiring integer data of fixed widths, specific locations and exact alignments. Both C and C++ developers should know that it is important to update their coding standards even if the compiler is not C99 compliant because a version of stdint.h (for C), and a version of stdint.h and cstdint can be downloaded or quickly created. Care should be taken because the wrong version of the header will mean that types do not match reality.

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  • stdint.h is a header file in the C standard library introduced in the C99 standard library section 7.18 to allow programmers to write more portable code by providing a set of typedefs that specify exact-width integer types, together with the defined minimum and maximum allowable values for each type, using macros. This header is particularly useful for embedded programming which often involves considerable manipulation of hardware specific I/O registers requiring integer data of fixed widths, specific locations and exact alignments. Both C and C++ developers should know that it is important to update their coding standards even if the compiler is not C99 compliant because a version of stdint.h (for C), and a version of stdint.h and cstdint can be downloaded or quickly created. Care should be taken because the wrong version of the header will mean that types do not match reality. The naming convention for exact-width integer types is intN_t for signed integers and uintN_t for unsigned integers. For example int8_t and uint64_t amongst others could be declared together with defining their corresponding ranges INT8_MIN to INT8_MAX and 0 (zero) to UINT64_MAX; again using a similar but uppercase naming convention. In addition stdint.h defines limits of integer types capable of holding object pointers such as UINTPTR_MAX, the value of which depends on the processor and its address range. The exact-width types and their corresponding ranges are only included in that header if they exist for that specific compiler/processor. Note that even on the same processor, two different compiler implementations can differ. The use of #if or #ifdef would allow the inclusion or exclusion of types by the use of compilers preprocessor so that the correct exact-width set is selected for a compiler and its processor target. (en)
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  • SUS (en)
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  • integer types (en)
  • stdint.h (en)
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  • stdint.h is a header file in the C standard library introduced in the C99 standard library section 7.18 to allow programmers to write more portable code by providing a set of typedefs that specify exact-width integer types, together with the defined minimum and maximum allowable values for each type, using macros. This header is particularly useful for embedded programming which often involves considerable manipulation of hardware specific I/O registers requiring integer data of fixed widths, specific locations and exact alignments. Both C and C++ developers should know that it is important to update their coding standards even if the compiler is not C99 compliant because a version of stdint.h (for C), and a version of stdint.h and cstdint can be downloaded or quickly created. Care should be taken because the wrong version of the header will mean that types do not match reality. (en)
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  • Stdint.h (en)
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