【转贴】C++中INT，FLOAT等的最大值 -

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【转贴】C++中INT，FLOAT等的最大值

/Microsoft Visual Studio\VC98\Include\LIMITS.H中定义的：

#define MB_LEN_MAX    2             /* 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 */

#if     _INTEGRAL_MAX_BITS >= 8
#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 */
#endif

#if     _INTEGRAL_MAX_BITS >= 16
#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 */
#endif

#if     _INTEGRAL_MAX_BITS >= 32
#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 */
#endif

#if     _INTEGRAL_MAX_BITS >= 64
/* 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
#endif

#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

\Microsoft Visual Studio\VC98\Include\FLOAT.H中定义：

#define DBL_DIG         15                      /* # of decimal digits of precision */
#define DBL_EPSILON     2.2204460492503131e-016 /* smallest such that 1.0+DBL_EPSILON != 1.0 */
#define DBL_MANT_DIG    53                      /* # of bits in mantissa */
#define DBL_MAX         1.7976931348623158e+308 /* max value */
#define DBL_MAX_10_EXP  308                     /* max decimal exponent */
#define DBL_MAX_EXP     1024                    /* max binary exponent */
#define DBL_MIN         2.2250738585072014e-308 /* min positive value */
#define DBL_MIN_10_EXP  (-307)                  /* min decimal exponent */
#define DBL_MIN_EXP     (-1021)                 /* min binary exponent */
#define _DBL_RADIX      2                       /* exponent radix */
#define _DBL_ROUNDS     1                       /* addition rounding: near */

#define FLT_DIG         6                       /* # of decimal digits of precision */
#define FLT_EPSILON     1.192092896e-07F        /* smallest such that 1.0+FLT_EPSILON != 1.0 */
#define FLT_GUARD       0
#define FLT_MANT_DIG    24                      /* # of bits in mantissa */
#define FLT_MAX         3.402823466e+38F        /* max value */
#define FLT_MAX_10_EXP  38                      /* max decimal exponent */
#define FLT_MAX_EXP     128                     /* max binary exponent */
#define FLT_MIN         1.175494351e-38F        /* min positive value */
#define FLT_MIN_10_EXP  (-37)                   /* min decimal exponent */
#define FLT_MIN_EXP     (-125)                  /* min binary exponent */
#define FLT_NORMALIZE   0
#define FLT_RADIX       2                       /* exponent radix */
#define FLT_ROUNDS      1                       /* addition rounding: near */

#ifndef _M_M68K
#define LDBL_DIG        DBL_DIG                 /* # of decimal digits of precision */
#define LDBL_EPSILON    DBL_EPSILON             /* smallest such that 1.0+LDBL_EPSILON != 1.0 */
#define LDBL_MANT_DIG   DBL_MANT_DIG            /* # of bits in mantissa */
#define LDBL_MAX        DBL_MAX                 /* max value */
#define LDBL_MAX_10_EXP DBL_MAX_10_EXP          /* max decimal exponent */
#define LDBL_MAX_EXP    DBL_MAX_EXP             /* max binary exponent */
#define LDBL_MIN        DBL_MIN                 /* min positive value */
#define LDBL_MIN_10_EXP DBL_MIN_10_EXP          /* min decimal exponent */
#define LDBL_MIN_EXP    DBL_MIN_EXP             /* min binary exponent */
#define _LDBL_RADIX     DBL_RADIX               /* exponent radix */
#define _LDBL_ROUNDS    DBL_ROUNDS              /* addition rounding: near */
#else
#define LDBL_DIG        18                                      /* # of decimal digits of precision */
#define LDBL_EPSILON    1.08420217248550443412e-019L            /* smallest such that 1.0+LDBL_EPSILON != 1.0 */
#define LDBL_MANT_DIG   64                                      /* # of bits in mantissa */
#define LDBL_MAX        1.189731495357231765e+4932L             /* max value */
#define LDBL_MAX_10_EXP 4932                                    /* max decimal exponent */
#define LDBL_MAX_EXP    16384                                   /* max binary exponent */
#define LDBL_MIN        3.3621031431120935063e-4932L            /* min positive value */
#define LDBL_MIN_10_EXP (-4931)                                 /* min decimal exponent */
#define LDBL_MIN_EXP    (-16381)                                /* min binary exponent */
#define _LDBL_RADIX     2                                       /* exponent radix */
#define _LDBL_ROUNDS    1                                       /* addition rounding: near */
#endif

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