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<stdint.h>
int8_tint16_tint32_tint64_t
()
 8, 16, 32 64 2 ( )
( ) []
int_fast8_tint_fast16_tint_fast32_tint_fast64_t
 8, 16, 32 64
( ) []
int_least8_tint_least16_tint_least32_tint_least64_t
 8, 16, 32 64
( ) []
intmax_t
( ) []
intptr_t
()
 , void
( ) []
uint8_tuint16_tuint32_tuint64_t
()
 8, 16, 32 64
( )
( ) []
uint_fast8_tuint_fast16_tuint_fast32_tuint_fast64_t
 8, 16, 32 64
( ) []
uint_least8_tuint_least16_tuint_least32_tuint_least64_t
 8, 16, 32 64
( ) []
uintmax_t
( ) []
uintptr_t
()
 , void
( ) []

The implementation may define typedef names intN_t, int_fastN_t, int_leastN_t, uintN_t, uint_fastN_t, and uint_leastN_t when N is not 8, 16, 32 or 64. Typedef names of the form intN_t may only be defined if the implementation supports an integer type of that width with no padding. Thus, uint24_t denotes an unsigned integer type with a width of exactly 24 bits.

Each of the macros listed in below is defined if and only if the implementation defines the corresponding typedef name. The macros INTN_C and UINTN_C correspond to the typedef names int_leastN_t and uint_leastN_t, respectively.

<stdint.h>
Signed integers : width
INT8_WIDTHINT16_WIDTHINT32_WIDTHINT64_WIDTH
(C23)()
 bit width of an object of type int8_t, int16_t, int32_t, int64_t (exactly 8, 16, 32, 64)
()
INT_FAST8_WIDTHINT_FAST16_WIDTHINT_FAST32_WIDTHINT_FAST64_WIDTH
(C23)
 bit width of an object of type int_fast8_t, int_fast16_t, int_fast32_t, int_fast64_t
()
INT_LEAST8_WIDTHINT_LEAST16_WIDTHINT_LEAST32_WIDTHINT_LEAST64_WIDTH
(C23)
 bit width of an object of type int_least8_t, int_least16_t, int_least32_t, int_least64_t
()
INTPTR_WIDTH
(C23)()
 bit width of an object of type intptr_t
()
INTMAX_WIDTH
(C23)
 bit width of an object of type intmax_t
()
Signed integers : minimum value
INT8_MININT16_MININT32_MININT64_MIN
()
 std::int8_t, std::int16_t, std::int32_t std::int64_t
() []
INT_FAST8_MININT_FAST16_MININT_FAST32_MININT_FAST64_MIN
 std::int_fast8_t, std::int_fast16_t, std::int_fast32_t std::int_fast64_t
() []
INT_LEAST8_MININT_LEAST16_MININT_LEAST32_MININT_LEAST64_MIN
 std::int_least8_t, std::int_least16_t, std::int_least32_t std::int_least64_t
() []
INTPTR_MIN
()
 std::intptr_t
() []
INTMAX_MIN
 std::intmax_t
() []
Signed integers : maximum value
INT8_MAXINT16_MAXINT32_MAXINT64_MAX
()
 std::int8_t, std::int16_t, std::int32_t std::int64_t
() []
INT_FAST8_MAXINT_FAST16_MAXINT_FAST32_MAXINT_FAST64_MAX
 std::int_fast8_t, std::int_fast16_t, std::int_fast32_t std::int_fast64_t
() []
INT_LEAST8_MAXINT_LEAST16_MAXINT_LEAST32_MAXINT_LEAST64_MAX
 std::int_least8_t, std::int_least16_t, std::int_least32_t std::int_least64_t
() []
INTPTR_MAX
()
 std::intptr_t
() []
INTMAX_MAX
 std::intmax_t
() []
Unsigned integers : width
UINT8_WIDTHUINT16_WIDTHUINT32_WIDTHUINT64_WIDTH
(C23)()
 bit width of an object of type uint8_t, uint16_t, uint32_t, uint64_t (exactly 8, 16, 32, 64)
()
UINT_FAST8_WIDTHUINT_FAST16_WIDTHUINT_FAST32_WIDTHUINT_FAST64_WIDTH
(C23)
 bit width of an object of type uint_fast8_t, uint_fast16_t, uint_fast32_t, uint_fast64_t
()
UINT_LEAST8_WIDTHUINT_LEAST16_WIDTHUINT_LEAST32_WIDTHUINT_LEAST64_WIDTH
(C23)
 bit width of an object of type uint_least8_t, uint_least16_t, uint_least32_t, uint_least64_t
()
UINTPTR_WIDTH
(C23)()
 bit width of an object of type uintptr_t
()
UINTMAX_WIDTH
(C23)
 bit width of an object of type uintmax_t
()
Unsigned integers : maximum value
UINT8_MAXUINT16_MAXUINT32_MAXUINT64_MAX
()
 std::uint8_t, std::uint16_t, std::uint32_t std::uint64_t
() []
UINT_FAST8_MAXUINT_FAST16_MAXUINT_FAST32_MAXUINT_FAST64_MAX
 std::uint_fast8_t, std::uint_fast16_t, std::uint_fast32_t std::uint_fast64_t
() []
UINT_LEAST8_MAXUINT_LEAST16_MAXUINT_LEAST32_MAXUINT_LEAST64_MAX
 std::uint_least8_t, std::uint_least16_t, std::uint_least32_t std::uint_least64_t
() []
UINTPTR_MAX
()
 std::uintptr_t
() []
UINTMAX_MAX
 std::uintmax_t
() []

-

<stdint.h>
INT8_CINT16_CINT32_CINT64_C
 , , , std::int_least8_t, std::int_least16_t, std::int_least32_t std::int_least64_t
(-) []
INTMAX_C
 , , , std::intmax_t
(-) []
UINT8_CUINT16_CUINT32_CUINT64_C
 , , , std::uint_least8_t, std::uint_least16_t, std::uint_least32_t std::uint_least64_t
(-) []
UINTMAX_C
 , , , std::uintmax_t
(-) [] 
#include <stdint.h>
UINT64_C(0x123) // might expand to 0x123ULL or 0x123UL


<inttypes.h>

fprintf

Each of the PRI macros listed here is defined if and only if the implementation defines the corresponding typedef name.

Equivalent
for int or
unsigned int 		Description Macros for data types




[u]intx_t
[u]int_leastx_t
[u]int_fastx_t
[u]intmax_t
[u]intptr_t
d output of a signed decimal integer value PRIdx PRIdLEASTx PRIdFASTx PRIdMAX PRIdPTR
i PRIix PRIiLEASTx PRIiFASTx PRIiMAX PRIiPTR
u output of an unsigned decimal integer value PRIux PRIuLEASTx PRIuFASTx PRIuMAX PRIuPTR
o output of an unsigned octal integer value PRIox PRIoLEASTx PRIoFASTx PRIoMAX PRIoPTR
x output of an unsigned lowercase hexadecimal integer value PRIxx PRIxLEASTx PRIxFASTx PRIxMAX PRIxPTR
X output of an unsigned uppercase hexadecimal integer value PRIXx PRIXLEASTx PRIXFASTx PRIXMAX PRIXPTR

fscanf

Each of the SCN macros listed in here is defined if and only if the implementation defines the corresponding typedef name and has a suitable fscanf length modifier for the type.

Equivalent
for int or
unsigned int 		Description Macros for data types




[u]intx_t
[u]int_leastx_t
[u]int_fastx_t
[u]intmax_t
[u]intptr_t
d input of a signed decimal integer value SCNdx SCNdLEASTx SCNdFASTx SCNdMAX SCNdPTR
i input of a signed integer value (base is determined by the first characters parsed) SCNix SCNiLEASTx SCNiFASTx SCNiMAX SCNiPTR
u input of an unsigned decimal integer value SCNux SCNuLEASTx SCNuFASTx SCNuMAX SCNuPTR
o input of an unsigned octal integer value SCNox SCNoLEASTx SCNoFASTx SCNoMAX SCNoPTR
x input of an unsigned hexadecimal integer value SCNxx SCNxLEASTx SCNxFASTx SCNxMAX SCNxPTR 

#include <stdio.h>
#include <inttypes.h>

int main(void)
{
    printf("%zu\n", sizeof(int64_t));
    printf("%s\n", PRId64);
    printf("%+"PRId64"\n", INT64_MIN);
    printf("%+"PRId64"\n", INT64_MAX);
    
    int64_t n = 7;
    printf("%+"PRId64"\n", n);
}

: 

8
lld
-9223372036854775808
+9223372036854775807
+7

  • C17 (ISO/IEC 9899:2018):
  • 7.8.1 Macros for format specifiers (. 158-159)
  • 7.18 Integer types <stdint.h> (. 212-216)
  • C11 (ISO/IEC 9899:2011):
  • 7.8.1 Macros for format specifiers (. 217-218)
  • 7.18 Integer types <stdint.h> (. 289-295)
  • C99 (ISO/IEC 9899:1999):
  • 7.8.1 Macros for format specifiers (. 198-199)
  • 7.18 Integer types <stdint.h> (. 255-261)

.

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