Climit中的宏定义

最新推荐文章于 2021-05-22 13:14:01 发布

原创最新推荐文章于 2021-05-22 13:14:01 发布 · 1.3k 阅读

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#output #c

本文详细介绍了C语言中climits头文件所包含的各种常量及其意义。这些常量定义了不同整数类型所能表示的最大最小值，对于理解C语言的数据类型范围至关重要。

Climits实际包括的是标准C的limits.h头文件

Constant	Meaning	Value
CHAR_BIT	Number of bits in the smallest variable that is not a bit field.	8
SCHAR_MIN	Minimum value for a variable of type signed char.	–128
SCHAR_MAX	Maximum value for a variable of type signed char.	127
UCHAR_MAX	Maximum value for a variable of type unsigned char.	255 (0xff)
CHAR_MIN	Minimum value for a variable of type char.	–128; 0 if /J option used
CHAR_MAX	Maximum value for a variable of type char.	127; 255 if /J option used
MB_LEN_MAX	Maximum number of bytes in a multicharacter constant.	2
SHRT_MIN	Minimum value for a variable of type short.	–32768
SHRT_MAX	Maximum value for a variable of type short.	32767
USHRT_MAX	Maximum value for a variable of type unsigned short.	65535 (0xffff)
INT_MIN	Minimum value for a variable of type int.	–2147483647 – 1
INT_MAX	Maximum value for a variable of type int.	2147483647
UINT_MAX	Maximum value for a variable of type unsigned int.	4294967295 (0xffffffff)
LONG_MIN	Minimum value for a variable of type long.	–2147483647 – 1
LONG_MAX	Maximum value for a variable of type long.	2147483647
ULONG_MAX	Maximum value for a variable of type unsigned long.	4294967295 (0xffffffff)

实验看看:

#include "stdafx.h" #include <climits> int _tmain(int argc, _TCHAR* argv[]) { printf("CHAR_BIT: %d/r/n",CHAR_BIT); printf("CHAR_MIN: %d/r/n",CHAR_MIN); printf("CHAR_MAX: %d/r/n",CHAR_MAX); printf("SCHAR_MIN: %d/r/n",SCHAR_MIN); printf("SCHAR_MAX: %d/r/n",SCHAR_MAX); printf("UCHAR_MAX: %d/r/n",UCHAR_MAX); printf("MB_LEN_MAX: %ld/r/n", MB_LEN_MAX); printf("SHRT_MIN: %d/r/n",SHRT_MIN); printf("SHRT_MAX: %d/r/n",SHRT_MAX); printf("USHRT_MAX: %d/r/n",USHRT_MAX); printf("INT_MIN: %X/r/n", INT_MIN); printf("INT_MAX: %X/r/n", INT_MAX); printf("UINT_MAX: %X/r/n", UINT_MAX); printf("LONG_MIN: %X/r/n", LONG_MIN); printf("LONG_MAX: %X/r/n", LONG_MAX); printf("ULONG_MAX: %X/r/n", ULONG_MAX); printf("_I64_MAX: %X/r/n", _I64_MAX); printf("_I32_MAX: %X/r/n", _I32_MAX); printf("_I32_MIN: %X/r/n", _I32_MIN); return 0; }

output:

CHAR_BIT: 8
CHAR_MIN: -128
CHAR_MAX: 127
SCHAR_MIN: -128
SCHAR_MAX: 127
UCHAR_MAX: 255
MB_LEN_MAX: 5
SHRT_MIN: -32768
SHRT_MAX: 32767
USHRT_MAX: 65535
INT_MIN: 80000000
INT_MAX: 7FFFFFFF
UINT_MAX: FFFFFFFF
LONG_MIN: 80000000
LONG_MAX: 7FFFFFFF
ULONG_MAX: FFFFFFFF
_I64_MAX: FFFFFFFF
_I32_MAX: 7FFFFFFF
_I32_MIN: 80000000