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float.h
鎖定
float.h，C語言標準庫頭文件，提供了浮點型的範圍和精度的宏，一般用於數值分析。 float.h包含了一組與浮點值相關的依賴於平台的常量。
- 中文名
- 與浮點值相關的依賴於平台的常量頭文件
- 外文名
- float.h
- 性 質
- 頭文件
- 類 型
- C語言標準庫頭文件
float.h釋義
float.h被定義的宏
double
DBL_DIG | 小數點後面精確的位數 |
DBL_EPSILON | 小的正數 ,double的0跨度值 |
DBL_MANT_DIG | 尾數中的位數 |
DBL_MAX | 最大值 |
DBL_MAX_10_EXP | 最大10進制指數 |
DBL_MAX_EXP | 最大2進制指數 |
DBL_MIN | 最小值 |
DBL_MIN_10_EXP | 最小10進制指數 |
DBL_MIN_EXP | 最小2進制指數 |
float
FLT_DIG | float小數點後面精確的位數 |
FLT_EPSILON | 小的正數,float的0跨度值 |
FLT_MANT_DIG | 尾數中的位數 |
FLT_MAX | 最大值 |
FLT_MAX_10_EXP | 最大10進制指數 |
FLT_MAX_EXP | 最大2進制指數 |
FLT_MIN | 最小值 |
FLT_MIN_10_EXP | 最小10進制指數 |
FLT_MIN_EXP | 最小2進制指數 |
FLT_RADIX | 進制基數 |
FLT_ROUNDS | 加法舍入 |
long double
LDBL_DIG | long double小數點後面精確的位數 |
LDBL_EPSILON | 小的正數,long double的0跨度值 |
LDBL_MANT_DIG | 尾數中的位數 |
LDBL_MAX | 最大值 |
LDBL_MAX_10_EXP | 最大10進制指數 |
LDBL_MAX_EXP | 最大2進制指數 |
LDBL_MIN | 最小值 |
LDBL_MIN_10_EXP | 最小10進制指數 |
LDBL_MIN_EXP | 最小2進制指數 |
float.h源文件
/* float.h
Defines implementation specific macros for dealing with floating point.
*/
#ifndef __FLOAT_H
#define __FLOAT_H
#if !defined( __DEFS_H )
#include <_defs.h>
#endif
#define FLT_RADIX 2
#define FLT_ROUNDS 1
#define FLT_GUARD 1
#define FLT_NORMALIZE 1
#define DBL_DIG 15
#define FLT_DIG 6
#define LDBL_DIG 19
#define DBL_MANT_DIG 53
#define FLT_MANT_DIG 24
#define LDBL_MANT_DIG 64
#define DBL_EPSILON 2.2204460492503131E-16
#define FLT_EPSILON 1.19209290E-07F
#define LDBL_EPSILON 1.084202172/*河蟹*/485504E-19/* smallest positive IEEE normal numbers */
#define DBL_MIN 2.2250738585072014E-308
#define FLT_MIN 1.17549435E-38F
#define LDBL_MIN _tiny_ldble
#define DBL_MAX _huge_dble
#define FLT_MAX _huge_flt
#define LDBL_MAX _huge_ldble
#define DBL_MAX_EXP +1024
#define FLT_MAX_EXP +128
#define LDBL_MAX_EXP +16384
#define DBL_MAX_10_EXP +308
#define FLT_MAX_10_EXP +38
#define LDBL_MAX_10_EXP +4932
#define DBL_MIN_10_EXP -307
#define FLT_MIN_10_EXP -37
#define LDBL_MIN_10_EXP -4931
#define DBL_MIN_EXP -1021
#define FLT_MIN_EXP -125
#define LDBL_MIN_EXP -16381
extern float _Cdecl _huge_flt;
extern double _Cdecl _huge_dble;
extern long double _Cdecl _huge_ldble;
extern long double _Cdecl _tiny_ldble;
#ifdef __cplusplus
extern "C" {
#endif
unsigned int _Cdecl _clear87(void);
unsigned int _Cdecl _control87(unsigned int __newcw, unsigned int __mask);
void _Cdecl _fpreset(void);
unsigned int _Cdecl _status87(void);
#ifdef __cplusplus
}
#endif
#if !__STDC__
/* 8087/80287 Status Word format */
#define SW_INVALID 0x0001 /* Invalid operation */
#define SW_DENORMAL 0x0002 /* Denormalized operand */
#define SW_ZERODIVIDE 0x0004 /* Zero divide */
#define SW_OVERFLOW 0x0008 /* Overflow */
#define SW_UNDERFLOW 0x0010 /* Underflow */
#define SW_INEXACT 0x0020 /* Precision (Inexact result) */
/* 8087/80287 Control Word format */
#define MCW_EM 0x003f /* interrupt Exception Masks*/
#define EM_INVALID 0x0001 /* invalid */
#define EM_DENORMAL 0x0002 /* denormal */
#define EM_ZERODIVIDE 0x0004 /* zero divide */
#define EM_OVERFLOW 0x0008 /* overflow */
#define EM_UNDERFLOW 0x0010 /* underflow */
#define EM_INEXACT 0x0020 /* inexact (precision) */
#define MCW_IC 0x1000 /* Infinity Control */
#define IC_AFFINE 0x1000 /* affine */
#define IC_PROJECTIVE 0x0000 /* projective */
#define MCW_RC 0x0c00 /* Rounding Control */
#define RC_CHOP 0x0c00 /* chop */
#define RC_UP 0x0800 /* up */
#define RC_DOWN 0x0400 /* down */
#define RC_NEAR 0x0000 /* near */
#define MCW_PC 0x0300 /* Precision Control */
#define PC_24 0x0000 /* 24 bits */
#define PC_53 0x0200 /* 53 bits */
#define PC_64 0x0300 /* 64 bits */
/* 8087/80287 Initial Control Word */
/* use affine infinity, mask underflow and precision exceptions */
#define CW_DEFAULT _default87
extern unsigned int _Cdecl _default87;
/* SIGFPE signal error types (for integer & float exceptions). */
#define FPE_INTOVFLOW 126 /* 80x86 Interrupt on overflow */
#define FPE_INTDIV0 127 /* 80x86 Integer divide by zero */
#define FPE_INVALID 129 /* 80x87 invalid operation */
#define FPE_ZERODIVIDE 131 /* 80x87 divide by zero */
#define FPE_OVERFLOW 132 /* 80x87 arithmetic overflow */
#define FPE_UNDERFLOW 133 /* 80x87 arithmetic underflow */
#define FPE_INEXACT 134 /* 80x87 precision loss */
#define FPE_STACKFAULT 135 /* 80x87 stack overflow */
#define FPE_EXPLICITGEN 140 /* When SIGFPE is raise()'d */
/* SIGSEGV signal error types. */
#define SEGV_BOUND 10 /* A BOUND violation (SIGSEGV) */
#define SEGV_EXPLICITGEN 11 /* When SIGSEGV is raise()'d */
/* SIGILL signal error types. */
#define ILL_EXECUTION 20 /* Illegal operation exception */
#define ILL_EXPLICITGEN 21 /* When SIGILL is raise()'d */
#endif /* !__STDC__ */
#endif
Visual Studio 2019版本：
//
// float.h
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// Implementation-defined values commonly used by sophisticated numerical
// (floating point) programs.
//
#pragma once
#ifndef _INC_FLOAT // include guard for 3rd party interop
#define _INC_FLOAT
#include <corecrt.h>
_CRT_BEGIN_C_HEADER
#ifndef _CRT_MANAGED_FP_DEPRECATE
#ifdef _CRT_MANAGED_FP_NO_DEPRECATE
#define _CRT_MANAGED_FP_DEPRECATE
#else
#ifdef _M_CEE
#define _CRT_MANAGED_FP_DEPRECATE _CRT_DEPRECATE_TEXT("Direct floating point control is not supported or reliable from within managed code. ")
#else
#define _CRT_MANAGED_FP_DEPRECATE
#endif
#endif
#endif
// Define the floating point precision used.
//
// For x86, results are in double precision (unless /arch:sse2 is used, in which
// case results are in source precision.
//
// For x64 and ARM, results are in source precision.
//
// If the compiler is invoked with /fp:fast, the compiler is allowed to use the
// fastest precision and even mix within a single function, so precision is
// indeterminable.
//
// Note that manipulating the floating point behavior using the float_control/
// fenv_access/fp_contract #pragmas may alter the actual floating point evaluation
// method, which may in turn invalidate the value of FLT_EVAL_METHOD.
#ifdef _M_FP_FAST
#define FLT_EVAL_METHOD -1
#else
#ifdef _M_IX86
#if _M_IX86_FP >= 2
#define FLT_EVAL_METHOD 0
#else
#define FLT_EVAL_METHOD 2
#endif
#else
#define FLT_EVAL_METHOD 0
#endif
#endif
//-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//
// Constants
//
//-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
#define DBL_DECIMAL_DIG 17 // # of decimal digits of rounding precision
#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_HAS_SUBNORM 1 // type does support subnormal numbers
#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_TRUE_MIN 4.9406564584124654e-324 // min positive value
#define FLT_DECIMAL_DIG 9 // # of decimal digits of rounding precision
#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_HAS_SUBNORM 1 // type does support subnormal numbers
#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 normalized 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_TRUE_MIN 1.401298464e-45F // min positive value
#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_HAS_SUBNORM DBL_HAS_SUBNORM // type does support subnormal numbers
#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 normalized 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_TRUE_MIN DBL_TRUE_MIN // min positive value
#define DECIMAL_DIG DBL_DECIMAL_DIG
//-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//
// Flags
//
//-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
#define _SW_INEXACT 0x00000001 // Inexact (precision)
#define _SW_UNDERFLOW 0x00000002 // Underflow
#define _SW_OVERFLOW 0x00000004 // Overflow
#define _SW_ZERODIVIDE 0x00000008 // Divide by zero
#define _SW_INVALID 0x00000010 // Invalid
#define _SW_DENORMAL 0x00080000 // Denormal status bit
// New Control Bit that specifies the ambiguity in control word.
#define _EM_AMBIGUIOUS 0x80000000 // For backwards compatibility
#define _EM_AMBIGUOUS 0x80000000
// Abstract User Control Word Mask and bit definitions
#define _MCW_EM 0x0008001f // Interrupt Exception Masks
#define _EM_INEXACT 0x00000001 // inexact (precision)
#define _EM_UNDERFLOW 0x00000002 // underflow
#define _EM_OVERFLOW 0x00000004 // overflow
#define _EM_ZERODIVIDE 0x00000008 // zero divide
#define _EM_INVALID 0x00000010 // invalid
#define _EM_DENORMAL 0x00080000 // Denormal exception mask (_control87 only)
#define _MCW_RC 0x00000300 // Rounding Control
#define _RC_NEAR 0x00000000 // near
#define _RC_DOWN 0x00000100 // down
#define _RC_UP 0x00000200 // up
#define _RC_CHOP 0x00000300 // chop
// i386 specific definitions
#define _MCW_PC 0x00030000 // Precision Control
#define _PC_64 0x00000000 // 64 bits
#define _PC_53 0x00010000 // 53 bits
#define _PC_24 0x00020000 // 24 bits
#define _MCW_IC 0x00040000 // Infinity Control
#define _IC_AFFINE 0x00040000 // affine
#define _IC_PROJECTIVE 0x00000000 // projective
// RISC specific definitions
#define _MCW_DN 0x03000000 // Denormal Control
#define _DN_SAVE 0x00000000 // save denormal results and operands
#define _DN_FLUSH 0x01000000 // flush denormal results and operands to zero
#define _DN_FLUSH_OPERANDS_SAVE_RESULTS 0x02000000 // flush operands to zero and save results
#define _DN_SAVE_OPERANDS_FLUSH_RESULTS 0x03000000 // save operands and flush results to zero
// Invalid subconditions (_SW_INVALID also set)
#define _SW_UNEMULATED 0x0040 // Unemulated instruction
#define _SW_SQRTNEG 0x0080 // Square root of a negative number
#define _SW_STACKOVERFLOW 0x0200 // FP stack overflow
#define _SW_STACKUNDERFLOW 0x0400 // FP stack underflow
// Floating point error signals and return codes
#define _FPE_INVALID 0x81
#define _FPE_DENORMAL 0x82
#define _FPE_ZERODIVIDE 0x83
#define _FPE_OVERFLOW 0x84
#define _FPE_UNDERFLOW 0x85
#define _FPE_INEXACT 0x86
#define _FPE_UNEMULATED 0x87
#define _FPE_SQRTNEG 0x88
#define _FPE_STACKOVERFLOW 0x8a
#define _FPE_STACKUNDERFLOW 0x8b
#define _FPE_EXPLICITGEN 0x8c // raise(SIGFPE);
// On x86 with arch:SSE2, the OS returns these exceptions
#define _FPE_MULTIPLE_TRAPS 0x8d
#define _FPE_MULTIPLE_FAULTS 0x8e
#define _FPCLASS_SNAN 0x0001 // signaling NaN
#define _FPCLASS_QNAN 0x0002 // quiet NaN
#define _FPCLASS_NINF 0x0004 // negative infinity
#define _FPCLASS_NN 0x0008 // negative normal
#define _FPCLASS_ND 0x0010 // negative denormal
#define _FPCLASS_NZ 0x0020 // -0
#define _FPCLASS_PZ 0x0040 // +0
#define _FPCLASS_PD 0x0080 // positive denormal
#define _FPCLASS_PN 0x0100 // positive normal
#define _FPCLASS_PINF 0x0200 // positive infinity
// Initial Control Word value
#if defined _M_IX86
#define _CW_DEFAULT (_RC_NEAR + _PC_53 + _EM_INVALID + _EM_ZERODIVIDE + _EM_OVERFLOW + _EM_UNDERFLOW + _EM_INEXACT + _EM_DENORMAL)
#elif defined _M_X64 || defined _M_ARM || defined _M_ARM64
#define _CW_DEFAULT (_RC_NEAR + _EM_INVALID + _EM_ZERODIVIDE + _EM_OVERFLOW + _EM_UNDERFLOW + _EM_INEXACT + _EM_DENORMAL)
#endif
//-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//
// State Manipulation
//
//-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// Note that reading or writing the floating point control or status words is
// not supported in managed code.
_CRT_MANAGED_FP_DEPRECATE
_ACRTIMP unsigned int __cdecl _clearfp(void);
#pragma warning(push)
#pragma warning(disable: 4141)
_CRT_MANAGED_FP_DEPRECATE _CRT_INSECURE_DEPRECATE(_controlfp_s)
_ACRTIMP unsigned int __cdecl _controlfp(
_In_ unsigned int _NewValue,
_In_ unsigned int _Mask
);
#pragma warning(pop)
_CRT_MANAGED_FP_DEPRECATE
_ACRTIMP void __cdecl _set_controlfp(
_In_ unsigned int _NewValue,
_In_ unsigned int _Mask
);
_CRT_MANAGED_FP_DEPRECATE
_ACRTIMP errno_t __cdecl _controlfp_s(
_Out_opt_ unsigned int* _CurrentState,
_In_ unsigned int _NewValue,
_In_ unsigned int _Mask
);
_CRT_MANAGED_FP_DEPRECATE
_ACRTIMP unsigned int __cdecl _statusfp(void);
_CRT_MANAGED_FP_DEPRECATE
_ACRTIMP void __cdecl _fpreset(void);
#ifdef _M_IX86
_CRT_MANAGED_FP_DEPRECATE
_ACRTIMP void __cdecl _statusfp2(
_Out_opt_ unsigned int* _X86Status,
_Out_opt_ unsigned int* _SSE2Status
);
#endif
#define _clear87 _clearfp
#define _status87 _statusfp
_CRT_MANAGED_FP_DEPRECATE
_ACRTIMP unsigned int __cdecl _control87(
_In_ unsigned int _NewValue,
_In_ unsigned int _Mask
);
#ifdef _M_IX86
_CRT_MANAGED_FP_DEPRECATE
_ACRTIMP int __cdecl __control87_2(
_In_ unsigned int _NewValue,
_In_ unsigned int _Mask,
_Out_opt_ unsigned int* _X86ControlWord,
_Out_opt_ unsigned int* _Sse2ControlWord
);
#endif
// Global variable holding floating point error code
_Check_return_
_ACRTIMP int* __cdecl __fpecode(void);
#define _fpecode (*__fpecode())
_Check_return_
_ACRTIMP int __cdecl __fpe_flt_rounds(void);
#define FLT_ROUNDS (__fpe_flt_rounds())
#define _DBL_ROUNDS FLT_ROUNDS
#define _LDBL_ROUNDS _DBL_ROUNDS
//-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//
// IEEE Recommended Functions
//
//-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
_Check_return_ _ACRTIMP double __cdecl _copysign(_In_ double _Number, _In_ double _Sign);
_Check_return_ _ACRTIMP double __cdecl _chgsign(_In_ double _X);
_Check_return_ _ACRTIMP double __cdecl _scalb(_In_ double _X, _In_ long _Y);
_Check_return_ _ACRTIMP double __cdecl _logb(_In_ double _X);
_Check_return_ _ACRTIMP double __cdecl _nextafter(_In_ double _X, _In_ double _Y);
_Check_return_ _ACRTIMP int __cdecl _finite(_In_ double _X);
_Check_return_ _ACRTIMP int __cdecl _isnan(_In_ double _X);
_Check_return_ _ACRTIMP int __cdecl _fpclass(_In_ double _X);
#ifdef _M_X64
_Check_return_ _ACRTIMP float __cdecl _scalbf(_In_ float _X, _In_ long _Y);
#endif
//-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//
// Nonstandard Names for Compatibility
//
//-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
#if defined(_CRT_INTERNAL_NONSTDC_NAMES) && _CRT_INTERNAL_NONSTDC_NAMES
#define clear87 _clear87
#define status87 _status87
#define control87 _control87
_CRT_MANAGED_FP_DEPRECATE
_ACRTIMP void __cdecl fpreset(void);
#define DBL_RADIX _DBL_RADIX
#define DBL_ROUNDS _DBL_ROUNDS
#define LDBL_RADIX _LDBL_RADIX
#define LDBL_ROUNDS _LDBL_ROUNDS
// For backwards compatibility with the old spelling
#define EM_AMBIGUIOUS _EM_AMBIGUOUS
#define EM_AMBIGUOUS _EM_AMBIGUOUS
#define MCW_EM _MCW_EM
#define EM_INVALID _EM_INVALID
#define EM_DENORMAL _EM_DENORMAL
#define EM_ZERODIVIDE _EM_ZERODIVIDE
#define EM_OVERFLOW _EM_OVERFLOW
#define EM_UNDERFLOW _EM_UNDERFLOW
#define EM_INEXACT _EM_INEXACT
#define MCW_IC _MCW_IC
#define IC_AFFINE _IC_AFFINE
#define IC_PROJECTIVE _IC_PROJECTIVE
#define MCW_RC _MCW_RC
#define RC_CHOP _RC_CHOP
#define RC_UP _RC_UP
#define RC_DOWN _RC_DOWN
#define RC_NEAR _RC_NEAR
#define MCW_PC _MCW_PC
#define PC_24 _PC_24
#define PC_53 _PC_53
#define PC_64 _PC_64
#define CW_DEFAULT _CW_DEFAULT
#define SW_INVALID _SW_INVALID
#define SW_DENORMAL _SW_DENORMAL
#define SW_ZERODIVIDE _SW_ZERODIVIDE
#define SW_OVERFLOW _SW_OVERFLOW
#define SW_UNDERFLOW _SW_UNDERFLOW
#define SW_INEXACT _SW_INEXACT
#define SW_UNEMULATED _SW_UNEMULATED
#define SW_SQRTNEG _SW_SQRTNEG
#define SW_STACKOVERFLOW _SW_STACKOVERFLOW
#define SW_STACKUNDERFLOW _SW_STACKUNDERFLOW
#define FPE_INVALID _FPE_INVALID
#define FPE_DENORMAL _FPE_DENORMAL
#define FPE_ZERODIVIDE _FPE_ZERODIVIDE
#define FPE_OVERFLOW _FPE_OVERFLOW
#define FPE_UNDERFLOW _FPE_UNDERFLOW
#define FPE_INEXACT _FPE_INEXACT
#define FPE_UNEMULATED _FPE_UNEMULATED
#define FPE_SQRTNEG _FPE_SQRTNEG
#define FPE_STACKOVERFLOW _FPE_STACKOVERFLOW
#define FPE_STACKUNDERFLOW _FPE_STACKUNDERFLOW
#define FPE_EXPLICITGEN _FPE_EXPLICITGEN
#endif // _CRT_INTERNAL_NONSTDC_NAMES
_CRT_END_C_HEADER
#endif // _INC_FLOAT
- 參考資料
-
- 1. C 標準庫 – | 菜鳥教程 ．菜鳥教程[引用日期2020-01-13]
- 2. (float.h) - C++ Reference ．cplusplus.com[引用日期2020-01-13]
- 詞條統計
-
- 瀏覽次數：次
- 編輯次數：15次歷史版本
- 最近更新： 君伟junwei521