C语言，limits.h

如题，看一看limits.h中的关于数据类型的长度定义

头文件 limits.h

//
// limits.h
//
//      Copyright (c) Microsoft Corporation. All rights reserved.
//
// The C Standard Library <limits.h> header.
//
#pragma once
#define _INC_LIMITS

#include <vcruntime.h>

_CRT_BEGIN_C_HEADER



#define CHAR_BIT      8         // number of bits in a char
#define SCHAR_MIN   (-128)      // minimum signed char value
#define SCHAR_MAX     127       // maximum signed char value
#define UCHAR_MAX     0xff      // maximum unsigned char value

#ifndef _CHAR_UNSIGNED
    #define CHAR_MIN    SCHAR_MIN   // mimimum char value
    #define CHAR_MAX    SCHAR_MAX   // maximum char value
#else
    #define CHAR_MIN    0
    #define CHAR_MAX    UCHAR_MAX
#endif

#define MB_LEN_MAX    5             // max. # bytes in multibyte char
#define SHRT_MIN    (-32768)        // minimum (signed) short value
#define SHRT_MAX      32767         // maximum (signed) short value
#define USHRT_MAX     0xffff        // maximum unsigned short value
#define INT_MIN     (-2147483647 - 1) // minimum (signed) int value
#define INT_MAX       2147483647    // maximum (signed) int value
#define UINT_MAX      0xffffffff    // maximum unsigned int value
#define LONG_MIN    (-2147483647L - 1) // minimum (signed) long value
#define LONG_MAX      2147483647L   // maximum (signed) long value
#define ULONG_MAX     0xffffffffUL  // maximum unsigned long value
#define LLONG_MAX     9223372036854775807i64       // maximum signed long long int value
#define LLONG_MIN   (-9223372036854775807i64 - 1)  // minimum signed long long int value
#define ULLONG_MAX    0xffffffffffffffffui64       // maximum unsigned long long int value

#define _I8_MIN     (-127i8 - 1)    // minimum signed 8 bit value
#define _I8_MAX       127i8         // maximum signed 8 bit value
#define _UI8_MAX      0xffui8       // maximum unsigned 8 bit value

#define _I16_MIN    (-32767i16 - 1) // minimum signed 16 bit value
#define _I16_MAX      32767i16      // maximum signed 16 bit value
#define _UI16_MAX     0xffffui16    // maximum unsigned 16 bit value

#define _I32_MIN    (-2147483647i32 - 1) // minimum signed 32 bit value
#define _I32_MAX      2147483647i32 // maximum signed 32 bit value
#define _UI32_MAX     0xffffffffui32 // maximum unsigned 32 bit value

// minimum signed 64 bit value
#define _I64_MIN    (-9223372036854775807i64 - 1)
// maximum signed 64 bit value
#define _I64_MAX      9223372036854775807i64
// maximum unsigned 64 bit value
#define _UI64_MAX     0xffffffffffffffffui64

#if _INTEGRAL_MAX_BITS >= 128
    // minimum signed 128 bit value
    #define _I128_MIN   (-170141183460469231731687303715884105727i128 - 1)
    // maximum signed 128 bit value
    #define _I128_MAX     170141183460469231731687303715884105727i128
    // maximum unsigned 128 bit value
    #define _UI128_MAX    0xffffffffffffffffffffffffffffffffui128
#endif

#ifndef SIZE_MAX
    #ifdef _WIN64
        #define SIZE_MAX _UI64_MAX
    #else
        #define SIZE_MAX UINT_MAX
    #endif
#endif

#if __STDC_WANT_SECURE_LIB__
    #ifndef RSIZE_MAX
        #define RSIZE_MAX (SIZE_MAX >> 1)
    #endif
#endif



_CRT_END_C_HEADER

我自己写的测试代码

#include<stdio.h>
#include <limits.h>

void main(void)
{
    printf("The bit number of char is 	%d
", CHAR_BIT);
    
    printf("The min number of char is 	%d
", CHAR_MIN);
    printf("The max number of char is 	%d
", CHAR_MAX);

    printf("The min number of schar is 	%d
", SCHAR_MIN);
    printf("The max number of schar is 	%d
", SCHAR_MAX);

    printf("The max number of uchar is 	%d
", UCHAR_MAX);

    printf("max. # bytes in multibyte char 	%d
", MB_LEN_MAX);

    printf("minimum (signed) short value 	%d
", SHRT_MIN);
    printf("maximum (signed) short value 	%d
", SHRT_MAX);

    printf("maximum unsigned short value 	%d
", USHRT_MAX);
    printf("minimum (signed) int value 	%d
", SHRT_MIN);
    printf("maximum (signed) int value 	%d
", INT_MAX);
    printf("maximum unsigned int value 	%d
", UINT_MAX);
    printf("minimum (signed) long value 	%d
", LONG_MIN);
    printf("maximum (signed) long value 	%d
", SHRT_MIN);
    printf("maximum unsigned long value 	%d
", ULONG_MAX);
    printf("maximum signed long long int value 	%d
", LLONG_MAX);
    printf("minimum signed long long int value 	%d
", LLONG_MIN);
    printf("maximum unsigned long long int value 	%d
", ULLONG_MAX);

    printf("minimum signed 8 bit value 	%d
", _I8_MIN);
    printf("maximum signed 8 bit value 	%d
", _I8_MAX);
    printf("maximum unsigned 8 bit value 	%d
", _UI8_MAX);

    printf("minimum signed 16 bit value 	%d
", _I16_MIN);
    printf("maximum signed 16 bit value 	%d
", _I16_MAX);
    printf("maximum unsigned 16 bit value 	%d
", _UI16_MAX);

    printf("minimum signed 32 bit value 	%d
", _I32_MIN);
    printf("maximum signed 32 bit value 	%d
", _I32_MAX);
    printf("maximum unsigned 32 bit value 	%d
", _UI32_MAX);
}

运行结果