[Programming] Các kiểu dữ liệu cơ bản

Integer types having exactly the specified width
typedef signed char int8_t
typedef unsigned char uint8_t
typedef signed int int16_t
typedef unsigned int uint16_t
typedef signed long int int32_t
typedef unsigned long int uint32_t
typedef signed long long int int64_t
typedef unsigned long long int uint64_t

Integer types capable of holding object pointers

These allow you to declare variables of the same size as a pointer.
typedef int16_t intptr_t
typedef uint16_t uintptr_t

Minimum-width integer types

Integer types having at least the specified width
typedef int8_t int_least8_t
typedef uint8_t uint_least8_t
typedef int16_t int_least16_t
typedef uint16_t uint_least16_t
typedef int32_t int_least32_t
typedef uint32_t uint_least32_t
typedef int64_t int_least64_t
typedef uint64_t uint_least64_t

Fastest minimum-width integer types

Integer types being usually fastest having at least the specified width
typedef int8_t int_fast8_t
typedef uint8_t uint_fast8_t
typedef int16_t int_fast16_t
typedef uint16_t uint_fast16_t
typedef int32_t int_fast32_t
typedef uint32_t uint_fast32_t
typedef int64_t int_fast64_t
typedef uint64_t uint_fast64_t

Greatest-width integer types

Types designating integer data capable of representing any value of any integer type in the corresponding signed or unsigned category
typedef int64_t intmax_t
typedef uint64_t uintmax_t

Limits of specified-width integer types

C++ implementations should define these macros only when __STDC_LIMIT_MACROS is defined before <stdint.h> is included
#define INT8_MAX   0x7f
#define INT8_MIN   (-INT8_MAX - 1)
#define UINT8_MAX   (__CONCAT(INT8_MAX, U) * 2U + 1U)
#define INT16_MAX   0x7fff
#define INT16_MIN   (-INT16_MAX - 1)
#define UINT16_MAX   (__CONCAT(INT16_MAX, U) * 2U + 1U)
#define INT32_MAX   0x7fffffffL
#define INT32_MIN   (-INT32_MAX - 1L)
#define UINT32_MAX   (__CONCAT(INT32_MAX, U) * 2UL + 1UL)
#define INT64_MAX   0x7fffffffffffffffLL
#define INT64_MIN   (-INT64_MAX - 1LL)
#define UINT64_MAX   (__CONCAT(INT64_MAX, U) * 2ULL + 1ULL)

Limits of minimum-width integer types

#define INT_LEAST8_MAX   INT8_MAX
#define INT_LEAST8_MIN   INT8_MIN
#define UINT_LEAST8_MAX   UINT8_MAX
#define INT_LEAST16_MAX   INT16_MAX
#define INT_LEAST16_MIN   INT16_MIN
#define UINT_LEAST16_MAX   UINT16_MAX
#define INT_LEAST32_MAX   INT32_MAX
#define INT_LEAST32_MIN   INT32_MIN
#define UINT_LEAST32_MAX   UINT32_MAX
#define INT_LEAST64_MAX   INT64_MAX
#define INT_LEAST64_MIN   INT64_MIN
#define UINT_LEAST64_MAX   UINT64_MAX

Limits of fastest minimum-width integer types

#define INT_FAST8_MAX   INT8_MAX
#define INT_FAST8_MIN   INT8_MIN
#define UINT_FAST8_MAX   UINT8_MAX
#define INT_FAST16_MAX   INT16_MAX
#define INT_FAST16_MIN   INT16_MIN
#define UINT_FAST16_MAX   UINT16_MAX
#define INT_FAST32_MAX   INT32_MAX
#define INT_FAST32_MIN   INT32_MIN
#define UINT_FAST32_MAX   UINT32_MAX
#define INT_FAST64_MAX   INT64_MAX
#define INT_FAST64_MIN   INT64_MIN
#define UINT_FAST64_MAX   UINT64_MAX

Limits of integer types capable of holding object pointers

#define INTPTR_MAX   INT16_MAX
#define INTPTR_MIN   INT16_MIN
#define UINTPTR_MAX   UINT16_MAX

Limits of greatest-width integer types

#define INTMAX_MAX   INT64_MAX
#define INTMAX_MIN   INT64_MIN
#define UINTMAX_MAX   UINT64_MAX

Limits of other integer types

C++ implementations should define these macros only when __STDC_LIMIT_MACROS is defined before <stdint.h> is included
#define PTRDIFF_MAX   INT16_MAX
#define PTRDIFF_MIN   INT16_MIN
#define SIG_ATOMIC_MAX   INT8_MAX
#define SIG_ATOMIC_MIN   INT8_MIN
#define SIZE_MAX   (__CONCAT(INT16_MAX, U))

Macros for integer constants

C++ implementations should define these macros only when __STDC_CONSTANT_MACROS is defined before <stdint.h> is included.
These definitions are valid for integer constants without suffix and for macros defined as integer constant without suffix
#define INT8_C(value)   ((int8_t) value)
#define UINT8_C(value)   ((uint8_t) __CONCAT(value, U))
#define INT16_C(value)   value
#define UINT16_C(value)   __CONCAT(value, U)
#define INT32_C(value)   __CONCAT(value, L)
#define UINT32_C(value)   __CONCAT(value, UL)
#define INT64_C(value)   __CONCAT(value, LL)
#define UINT64_C(value)   __CONCAT(value, ULL)
#define INTMAX_C(value)   __CONCAT(value, LL)
#define UINTMAX_C(value)   __CONCAT(value, ULL)


Detailed Description

 #include <stdint.h> 
Use [u]intN_t if you need exactly N bits.
Since these typedefs are mandated by the C99 standard, they are preferred over rolling your own typedefs.

Define Documentation

#define INT16_C ( value)    value
define a constant of type int16_t
#define INT16_MAX   0x7fff
largest positive value an int16_t can hold.
#define INT16_MIN   (-INT16_MAX - 1)
smallest negative value an int16_t can hold.
#define INT32_C ( value)    __CONCAT(value, L)
define a constant of type int32_t
#define INT32_MAX   0x7fffffffL
largest positive value an int32_t can hold.
#define INT32_MIN   (-INT32_MAX - 1L)
smallest negative value an int32_t can hold.
#define INT64_C ( value)    __CONCAT(value, LL)
define a constant of type int64_t
#define INT64_MAX   0x7fffffffffffffffLL
largest positive value an int64_t can hold.
#define INT64_MIN   (-INT64_MAX - 1LL)
smallest negative value an int64_t can hold.
#define INT8_C ( value)    ((int8_t) value)
define a constant of type int8_t
#define INT8_MAX   0x7f
largest positive value an int8_t can hold.
#define INT8_MIN   (-INT8_MAX - 1)
smallest negative value an int8_t can hold.
#define INT_FAST16_MAX   INT16_MAX
largest positive value an int_fast16_t can hold.
#define INT_FAST16_MIN   INT16_MIN
smallest negative value an int_fast16_t can hold.
#define INT_FAST32_MAX   INT32_MAX
largest positive value an int_fast32_t can hold.
#define INT_FAST32_MIN   INT32_MIN
smallest negative value an int_fast32_t can hold.
#define INT_FAST64_MAX   INT64_MAX
largest positive value an int_fast64_t can hold.
#define INT_FAST64_MIN   INT64_MIN
smallest negative value an int_fast64_t can hold.
#define INT_FAST8_MAX   INT8_MAX
largest positive value an int_fast8_t can hold.
#define INT_FAST8_MIN   INT8_MIN
smallest negative value an int_fast8_t can hold.
#define INT_LEAST16_MAX   INT16_MAX
largest positive value an int_least16_t can hold.
#define INT_LEAST16_MIN   INT16_MIN
smallest negative value an int_least16_t can hold.
#define INT_LEAST32_MAX   INT32_MAX
largest positive value an int_least32_t can hold.
#define INT_LEAST32_MIN   INT32_MIN
smallest negative value an int_least32_t can hold.
#define INT_LEAST64_MAX   INT64_MAX
largest positive value an int_least64_t can hold.
#define INT_LEAST64_MIN   INT64_MIN
smallest negative value an int_least64_t can hold.
#define INT_LEAST8_MAX   INT8_MAX
largest positive value an int_least8_t can hold.
#define INT_LEAST8_MIN   INT8_MIN
smallest negative value an int_least8_t can hold.
#define INTMAX_C ( value)    __CONCAT(value, LL)
define a constant of type intmax_t
#define INTMAX_MAX   INT64_MAX
largest positive value an intmax_t can hold.
#define INTMAX_MIN   INT64_MIN
smallest negative value an intmax_t can hold.
#define INTPTR_MAX   INT16_MAX
largest positive value an intptr_t can hold.
#define INTPTR_MIN   INT16_MIN
smallest negative value an intptr_t can hold.
#define PTRDIFF_MAX   INT16_MAX
largest positive value a ptrdiff_t can hold.
#define PTRDIFF_MIN   INT16_MIN
smallest negative value a ptrdiff_t can hold.
#define SIG_ATOMIC_MAX   INT8_MAX
largest positive value a sig_atomic_t can hold.
#define SIG_ATOMIC_MIN   INT8_MIN
smallest negative value a sig_atomic_t can hold.
#define SIZE_MAX   (__CONCAT(INT16_MAX, U))
largest value a size_t can hold.
#define UINT16_C ( value)    __CONCAT(value, U)
define a constant of type uint16_t
#define UINT16_MAX   (__CONCAT(INT16_MAX, U) * 2U + 1U)
largest value an uint16_t can hold.
#define UINT32_C ( value)    __CONCAT(value, UL)
define a constant of type uint32_t
#define UINT32_MAX   (__CONCAT(INT32_MAX, U) * 2UL + 1UL)
largest value an uint32_t can hold.
#define UINT64_C ( value)    __CONCAT(value, ULL)
define a constant of type uint64_t
#define UINT64_MAX   (__CONCAT(INT64_MAX, U) * 2ULL + 1ULL)
largest value an uint64_t can hold.
#define UINT8_C ( value)    ((uint8_t) __CONCAT(value, U))
define a constant of type uint8_t
#define UINT8_MAX   (__CONCAT(INT8_MAX, U) * 2U + 1U)
largest value an uint8_t can hold.
largest value an uint_fast16_t can hold.
largest value an uint_fast32_t can hold.
largest value an uint_fast64_t can hold.
#define UINT_FAST8_MAX   UINT8_MAX
largest value an uint_fast8_t can hold.
largest value an uint_least16_t can hold.
largest value an uint_least32_t can hold.
largest value an uint_least64_t can hold.
#define UINT_LEAST8_MAX   UINT8_MAX
largest value an uint_least8_t can hold.
#define UINTMAX_C ( value)    __CONCAT(value, ULL)
define a constant of type uintmax_t
#define UINTMAX_MAX   UINT64_MAX
largest value an uintmax_t can hold.
#define UINTPTR_MAX   UINT16_MAX
largest value an uintptr_t can hold.

Typedef Documentation

typedef signed int int16_t
16-bit signed type.
typedef signed long int int32_t
32-bit signed type.
typedef signed long long int int64_t
64-bit signed type.
Note:
This type is not available when the compiler option -mint8 is in effect.
typedef signed char int8_t
8-bit signed type.
fastest signed int with at least 16 bits.
fastest signed int with at least 32 bits.
fastest signed int with at least 64 bits.
Note:
This type is not available when the compiler option -mint8 is in effect.
fastest signed int with at least 8 bits.
signed int with at least 16 bits.
signed int with at least 32 bits.
signed int with at least 64 bits.
Note:
This type is not available when the compiler option -mint8 is in effect.
signed int with at least 8 bits.
typedef int64_t intmax_t
largest signed int available.
typedef int16_t intptr_t
Signed pointer compatible type.
typedef unsigned int uint16_t
16-bit unsigned type.
typedef unsigned long int uint32_t
32-bit unsigned type.
typedef unsigned long long int uint64_t
64-bit unsigned type.
Note:
This type is not available when the compiler option -mint8 is in effect.
typedef unsigned char uint8_t
8-bit unsigned type.
fastest unsigned int with at least 16 bits.
fastest unsigned int with at least 32 bits.
fastest unsigned int with at least 64 bits.
Note:
This type is not available when the compiler option -mint8 is in effect.
fastest unsigned int with at least 8 bits.
unsigned int with at least 16 bits.
unsigned int with at least 32 bits.
unsigned int with at least 64 bits.
Note:
This type is not available when the compiler option -mint8 is in effect.
unsigned int with at least 8 bits.
largest unsigned int available.
Unsigned pointer compatible type.

Src: http://www.nongnu.org/avr-libc/user-manual/group__avr__stdint.html
--
Mathhoang
vietam_hoangminhnguyen
 

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