limits.h专门用于检测整型数据数据类型的表达值范围。
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/* _lim.h - Internal version of "C" limits.h header Defines implementation specific limits on type values. */ /* * C/C++ Run Time Library - Version 11.0 * * Copyright (c) 1987, 2002 by Borland Software Corporation * All Rights Reserved. * */ #ifndef __LIMITS_H #define __LIMITS_H #define _INC_LIMITS /* MSC Guard name */ #include <_stddef.h> #define CHAR_BIT 8 /* number of bits in a char */ #define MB_LEN_MAX 2 /* max. # bytes in multibyte char */ #define SCHAR_MIN (-128) /* minimum signed char value */ #define SCHAR_MAX 127 /* maximum signed char value */ #define UCHAR_MAX 255 /* maximum unsigned char value */ #if ('\x80' < 0) #define CHAR_MIN SCHAR_MIN /* minimum char value */ #define CHAR_MAX SCHAR_MAX /* maximum char value */ #else #define CHAR_MIN 0 #define CHAR_MAX UCHAR_MAX #endif #define SHRT_MIN (-32767-1) /* minimum signed short value */ #define SHRT_MAX 32767 /* maximum signed short value */ #define USHRT_MAX 65535U /* maximum unsigned short value */ #define LONG_MIN (-2147483647L-1) /* minimum signed long value */ #define LONG_MAX 2147483647L /* maximum signed long value */ #define ULONG_MAX 4294967295UL /* maximum unsigned long value */ #if defined (_INTEGRAL_MAX_BITS) && (_INTEGRAL_MAX_BITS >= 64) #define _I64_MIN (-9223372036854775807i64-1) /* minimum signed __int64 value */ #define _I64_MAX 9223372036854775807i64 /* maximum signed __int64 value */ #define _UI64_MAX 18446744073709551615ui64 /* maximum unsigned __int64 value */ #endif #define INT_MIN LONG_MIN /* minimum signed int value */ #define INT_MAX LONG_MAX /* maximum signed int value */ #define UINT_MAX ULONG_MAX /* maximum unsigned int value */ #if defined(_POSIX_) #define _POSIX_ARG_MAX 4096 #define _POSIX_CHILD_MAX 6 #define _POSIX_LINK_MAX 8 #define _POSIX_MAX_CANON 255 #define _POSIX_MAX_INPUT 255 #define _POSIX_NAME_MAX 14 #define _POSIX_NGROUPS_MAX 0 #define _POSIX_OPEN_MAX 16 #define _POSIX_PATH_MAX 255 #define _POSIX_PIPE_BUF 512 #define _POSIX_SSIZE_MAX 32767 #define _POSIX_STREAM_MAX 8 #define _POSIX_TZNAME_MAX 3 #define ARG_MAX (16384 - 256) /* 16k-(heap overhead+safety) */ #define CHILD_MAX 32 #define LINK_MAX _POSIX_LINK_MAX #define MAX_CANON _POSIX_MAX_CANON #define MAX_INPUT _POSIX_MAX_INPUT #define NAME_MAX 255 #define NGROUPS_MAX 16 #define OPEN_MAX 32 #define PATH_MAX 512 #define PIPE_BUF _POSIX_PIPE_BUF #define SSIZE_MAX _POSIX_SSIZE_MAX #define STREAM_MAX 20 #define TZNAME_MAX 10 #endif /* POSIX */ #endif /* __LIMITS_H */ |