Linux伊甸园论坛 » C/C++ (STL/boost) » gcc数学函数问题

Sunkien 发表于 2007-12-13 22:05

gcc数学函数问题

gcc 版本 4.1.2 20070925 (Red Hat 4.1.2-33)(EA(m nc']Gy@A

P6@XkZ math.h头文件中没有sqrt(),sin , atan , atan2 , cos , sin , tan等数学函数&c.D:L,u$u
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请问这些函数在那个头文件中
4PO Ez0D7NsW 谢谢！
K4N} A+M;I1z !F|j6l)G*fI
math.h文件如下：BV+th4t"A
/* Declarations for math functions.
"]2Do:X
s"R.J{i    Copyright (C) 1991-1993, 1995-1999, 2001, 2002, 2004, 2006S"^-]Bc#Nd
   Free Software Foundation, Inc.
4G.s-N)XL)L    This file is part of the GNU C Library.
e.s/d%u`%KD.r
x1xTVn}ExQp    The GNU C Library is free software; you can redistribute it and/or)wo?E(}9u? |
   modify it under the terms of the GNU Lesser General PublicJ.p+@'Vq'g
   License as published by the Free Software Foundation; either
(_1fagIO&ZOt    version 2.1 of the License, or (at your option) any later version.
U'Hp%Zcz6m&o.k
h]3\4E]0{5\    The GNU C Library is distributed in the hope that it will be useful,2q3wwJ A4[r
   but WITHOUT ANY WARRANTY; without even the implied warranty ofD!W,C WN7]
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU$M
l+j}pt
   Lesser General Public License for more details.9{.Kv0wvFYeE

:q8h(ei6lS2p1?1Z    You should have received a copy of the GNU Lesser General Public0O2rP&J?c~/l
   License along with the GNU C Library; if not, write to the Free
4gMLNz:f3f h    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MAMLv P Av.ZKD`
   02111-1307 USA.  */CxZ"[c8V2~a

0?Py+M_ /*
+n#cFL%nl *      ISO C99 Standard: 7.12 Mathematics      <math.h>
%mCb2I3AZE \ */LR"t.W%U$xL

%j*j*x|.?;?
p)|"xW #ifndef _MATH_H
2EBn-]H?v2? #define _MATH_H 1
7Rj(DgIx3o#uQ
+y$x-d,O7f #include <features.h>
r+g)ln/rJo
6m| I*Z9T2[PO3[ __BEGIN_DECLS[;\ape
:fHa+il0pb
/* Get machine-dependent HUGE_VAL value (returned on overflow).
bK!AW7b&~ J_1p i    On all IEEE754 machines, this is +Infinity.  */
RpQ
V8J
Qkij #include <bits/huge_val.h>J9? u&F)w!w
#ifdef __USE_ISOC99
n^R
V;]/s6eB$o # include <bits/huge_valf.h>;u!S.]2x5G%F5I I.m
# include <bits/huge_vall.h>
fki~e$X (_[ uo(U;[y
/* Get machine-dependent INFINITY value.  */'W;}:OT&m$j}"u
# include <bits/inf.h>
%Lc ~&e%R6V.]D/^7F
x3H
Z!Q0Bh^5M /* Get machine-dependent NAN value (returned for some domain errors).  */|j$Y&},y7DI
# include <bits/nan.h>
Z(B9cvt&nlCAhoq #endif /* __USE_ISOC99 */)|:S/zqo9s$kq4v tG
g^e4Gqs|pJ;P
/* Get general and ISO C99 specific information.  */M$ZSQ"}re
#include <bits/mathdef.h>
q7}#|
eP(Bk

8]R4M o[ ^6Ss
ux /* The file <bits/mathcalls.h> contains the prototypes for all the
#a8~,q@:[%j    actual math functions.  These macros are used for those prototypes,"e|4hiG,s!N!c@]
   so we can easily declare each function as both `name' and `__name',m0Z,I1Fp+OTi
   and can declare the float versions `namef' and `__namef'.  */
6lA"d&V+[&}L*y E,g j?;v
?%K Dt
o}
#define __MATHCALL(function,suffix, args)       \+F-w L"@$p
  __MATHDECL (_Mdouble_,function,suffix, args)
_ q X$w6|4I ^ #define __MATHDECL(type, function,suffix, args) \y LDs/[r*F&^ U
  __MATHDECL_1(type, function,suffix, args); \
FP9_
`sp:yZ   __MATHDECL_1(type, __CONCAT(__,function),suffix, args)
U]$RO}|3pX`5E #define __MATHCALLX(function,suffix, args, attrib)      \
}N Tj:^-B6H0bJN&sZ   __MATHDECLX (_Mdouble_,function,suffix, args, attrib)

P sAN4\[M'G #define __MATHDECLX(type, function,suffix, args, attrib) \@1Hke)UY@x(ZS
  __MATHDECL_1(type, function,suffix, args) __attribute__ (attrib); \
.]7lC9p+D%CT   __MATHDECL_1(type, __CONCAT(__,function),suffix, args) __attribute__ (attrib) qJ/?!^g/QG{,n(|
#define __MATHDECL_1(type, function,suffix, args) \
8\8Fz`w/Rf   extern type __MATH_PRECNAME(function,suffix) args __THROW
zlR,o'Z7s~ E%F[`/F&UL
#define _Mdouble_               double
o,f^T f:w"x6@ #define __MATH_PRECNAME(name,r) __CONCAT(name,r)
$\wCtm&j/gU3J # define _Mdouble_BEGIN_NAMESPACE __BEGIN_NAMESPACE_STD
B7^*PC;z # define _Mdouble_END_NAMESPACE   __END_NAMESPACE_STD
$y3I m)\*l9CO;cQ5a&R #include <bits/mathcalls.h>
J6Tz2}^_b #undef  _Mdouble_
yZ\GY #undef _Mdouble_BEGIN_NAMESPACEY;S%sU#l
#undef _Mdouble_END_NAMESPACE0}\3f}EU(B2?X,O
#undef  __MATH_PRECNAME
7]w a6?&ch Os%l*YFq
#if defined __USE_MISC || defined __USE_ISOC99(X |.?P.BY

+z$[vcq SlPhv
L t2?7X^*Hu /* Include the file of declarations again, this time using `float'm5Y7i!Vw N k
   instead of `double' and appending f to each function name.  */
%xL`6S7@]|
s0qg P{:ch # ifndef _Mfloat_
}tHk G8~&}B #  define _Mfloat_              float
,`6yE I!~0@3Q3Zu # endif-vg}2W3A8HZS.m z6P^
# define _Mdouble_              _Mfloat_
"y\8^(DT7Nt6t # ifdef __STDC__
_Dy"\N%g3FG #  define __MATH_PRECNAME(name,r) name##f##rT!O$]!|#{ndI
# else
!ng|7pV\ #  define __MATH_PRECNAME(name,r) name/**/f/**/r0@X$M(Xx/@%Bp%\8x
# endif
Q&G%X-cwb
h # define _Mdouble_BEGIN_NAMESPACE __BEGIN_NAMESPACE_C99i|u[R\k| y#B
# define _Mdouble_END_NAMESPACE   __END_NAMESPACE_C99
Pp*u$s;rIth3X # include <bits/mathcalls.h>1gl ryT T }_
# undef _Mdouble_ Oi{)wue:?c
# undef _Mdouble_BEGIN_NAMESPACEJ XsY
Ey.Ft3u8x
# undef _Mdouble_END_NAMESPACE_M8t6])u^}es^G,q
# undef __MATH_PRECNAME
d3W A1h1EP7V q;TvV.k
# if (__STDC__ - 0 || __GNUC__ - 0) \w\V|.U O
     && (!defined __NO_LONG_DOUBLE_MATH || defined __LDBL_COMPAT)
agTC3Sr^ #  ifdef __LDBL_COMPAT2T$c R^u
\Ck)Ej"?3t!d
#   ifdef __USE_ISOC99
Ahyr1S7GU"M3_
} extern float __nldbl_nexttowardf (float __x, long double __y)
*iJb%Z)QGy                                   __THROW __attribute__ ((__const__));
(FU f&h2`
]?9n;tS} #    ifdef __REDIRECT_NTH
"H8S[a4z;Z\k extern float __REDIRECT_NTH (nexttowardf, (float __x, long double __y),
+U&fCk8m4dw4`                              __nldbl_nexttowardf)
OB^`/j%@^bY      __attribute__ ((__const__));
b9v5mzAd:{ S extern double __REDIRECT_NTH (nexttoward, (double __x, long double __y),
LRUb%BF3A3\                               nextafter) __attribute__ ((__const__));UfXCc'as R
extern long double __REDIRECT_NTH (nexttowardl,
Q$IH^;a!Q;b(F                                    (long double __x, long double __y),
o0j$E9kc+?k9Z"y5Ru                                    nextafter) __attribute__ ((__const__));'WnBb2ib
#    endif
q*VmG$jB%r8n #   endif
5|`$O`2s,NK(g P "k#X
JqKR~
/* Include the file of declarations again, this time using `long double'Di%i/N S1i6qClB
   instead of `double' and appending l to each function name.  */
RG]0f^:[F)h K TE6Dn ~&v2A
#   undef __MATHDECL_1Q#o!of3v_
#   define __MATHDECL_2(type, function,suffix, args, alias) \
aQ{)QZ4zI@   extern type __REDIRECT_NTH(__MATH_PRECNAME(function,suffix), \
z"ua,Fx\+qI
                             args, alias)1dO-c ?Zj
#   define __MATHDECL_1(type, function,suffix, args) \,u/GS6|6n,P
  __MATHDECL_2(type, function,suffix, args, __CONCAT(function,suffix))In"UAZ |^4x$O'Up
#  endif^"iDUTml
v&g*\B\5C H5oF2@4_
#  ifndef _Mlong_double_
(SFL2v(CT!Go #   define _Mlong_double_       long double6b?sNM
#  endif
!f4z$cK)a&DYa #  define _Mdouble_             _Mlong_double_X$fXFG7v
#  ifdef __STDC__
u ~1X)Pt;I.ep #   define __MATH_PRECNAME(name,r) name##l##r?:\3{&q.r,J
#  else
j gnqi1U%se #   define __MATH_PRECNAME(name,r) name/**/l/**/rx.gC&M4\
#  endif
W&OA,W4Keyc
#  define _Mdouble_BEGIN_NAMESPACE __BEGIN_NAMESPACE_C99]u`Ku2y%m,@
A
#  define _Mdouble_END_NAMESPACE   __END_NAMESPACE_C99
y8j!yu6W s ~sy!n #  include <bits/mathcalls.h>
$|fuPY&r #  undef _Mdouble_2kS
_'s(J;P
# undef _Mdouble_BEGIN_NAMESPACE
K-^%|I
{V4l)p)K # undef _Mdouble_END_NAMESPACE
!EY0~g.P6hOF #  undef __MATH_PRECNAME
p
v M'i[!tt-q SQ O&zQo SU
# endif /* __STDC__ || __GNUC__ */6E,D/IQ/Z+D2clB
FW'~8UMu8f
#endif  /* Use misc or ISO C99.  */$LK wSgd
b
#undef  __MATHDECL_13t z.P/a5Y1O*j-r"J+@
#undef  __MATHDECL|VQY2`E
#undef  __MATHCALL
SU'B0O K(lQ "_W V2dR9mW0Q
Y
m@Utgz
#if defined __USE_MISC || defined __USE_XOPENVW[s5HKd
/* This variable is used by `gamma' and `lgamma'.  */8j a.W
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o
extern int signgam;
7x x+B-b{CkX #endift w-s/o,M
_$mW(zZa-{Ew

EYWNH0X;[Z0Wl /* ISO C99 defines some generic macros which work on any data type.  */LELbaH0wXd
#ifdef __USE_ISOC99)['Wsj"y2L)z8?j
t b5x5sp/I5g
/* Get the architecture specific values describing the floating-point8J"N4sj$d/Vzr3N
   evaluation.  The following symbols will get defined:
A;@Qp8iD
]L8}g$\ ^     float_t     floating-point type at least as wide as `float' used
y s8Y*J5sq                 to evaluate `float' expressions
E'o y]G"F     double_t    floating-point type at least as wide as `double' used
M2Y7C5pFQA"nkx                 to evaluate `double' expressions}}p0tc-C'I

9j eo@B` j     FLT_EVAL_METHOD HH&VF/To
                Defined to
nG+j9R0T4o}}2A                   0     if `float_t' is `float' and `double_t' is `double'!jyct/REB/]NA
                  1     if `float_t' and `double_t' are `double'
5K,c9XC%E:Y0O/T4P0q                   2     if `float_t' and `double_t' are `long double'
jZ/UsV                   else  `float_t' and `double_t' are unspecified
4T L
I*?E&y8@R n9ODA;|$U9t
    INFINITY    representation of the infinity value of type `float'
AT*H`iN/t R H%?XR9a;tc{ k"V
    FP_FAST_FMA
$j] C m.KR(q)`)\     FP_FAST_FMAF
0S7hz
C0_q$Jn     FP_FAST_FMAL
2w;Y"@pU;x s [Gt                 If defined it indicates that the `fma' function
*m1K%OiqS%o*fG4J                 generally executes about as fast as a multiply and an add.
Z-s(Z:G@8U t                 This macro is defined only iff the `fma' function is
&Q0Qe&j#X Hb                 implemented directly with a hardware multiply-add instructions.
M R F?EN_
b9v~$^``#r%E     FP_ILOGB0   Expands to a value returned by `ilogb (0.0)'.'Z*D)w&|M
    FP_ILOGBNAN Expands to a value returned by `ilogb (NAN)'.
9V#l6I+^ UU
'C*I6L-^&G(Ls:H6Z`     DECIMAL_DIG Number of decimal digits supported by conversion between
B3wTM+p(Sb                 decimal and all internal floating-point formats.
e/_yN%~U2Y4zh]
/LcrhX4p5Q7O */
i ^,v0Gx,m0i!Z _4z6t,vU#U'Y(aA;q4H
@
/* All floating-point numbers can be put in one of these categories.  */IE%sQN;Q4I-v&r
enum
km5Dn`0gR   {,i#P1A
GC
    FP_NAN,#ZT3i*kLVcry
# define FP_NAN FP_NAN
\/M I2O,q     FP_INFINITE,M/nf d6^
# define FP_INFINITE FP_INFINITEoy1zc4K:UKX/P
    FP_ZERO,2ynO2RX
# define FP_ZERO FP_ZEROzL^A0z5Ig)Zd
    FP_SUBNORMAL,bG|4I8D'{;I
# define FP_SUBNORMAL FP_SUBNORMALuL#]k Gl
    FP_NORMAL
#}$tla[ r(C9eZ # define FP_NORMAL FP_NORMAL
1mh@$fW   };
/Y m5A#_"I+\0y.g
xDp%xr(t/e3M+m8Z] /* Return number of classification appropriate for X.  */^q3~+j#}(Y
# ifdef __NO_LONG_DOUBLE_MATH
BH3Sm&FgY'F #  define fpclassify(x) \m4oZ bJDy,\
     (sizeof (x) == sizeof (float) ? __fpclassifyf (x) : __fpclassify (x))(N[&V#wt`t
# else
Y oOYi&r #  define fpclassify(x) \)Yx:rsiu
     (sizeof (x) == sizeof (float)                                            \C5|*uITe
      ? __fpclassifyf (x)                                                     \
ta`5xgkgQ       : sizeof (x) == sizeof (double)                                         \
Q1I M c Wu       ? __fpclassify (x) : __fpclassifyl (x))
5}`#gm4RL # endif
1dX\:?I)z
p?/I{-|f+ndV ^ /* Return nonzero value if sign of X is negative.  */8B?i}/m7e
# ifdef __NO_LONG_DOUBLE_MATH
M W-bN"Y4?:p3Z%]? #  define signbit(x) \
+R6] BMB'_%@I      (sizeof (x) == sizeof (float) ? __signbitf (x) : __signbit (x))
.r"LBTEP(jD # else
"Hd3B|Qb #  define signbit(x) \@u xEsveH
     (sizeof (x) == sizeof (float)                                            \
O"{}+B/Q[[U9LE       ? __signbitf (x)                                                        \g"]i0b(S2J
V
      : sizeof (x) == sizeof (double)                                         \
Q,iIL@eb7pZ       ? __signbit (x) : __signbitl (x))
&bYZ
G1[.} B # endif
FKY)jr/W
&_n4eIFR [[i] 本帖最后由 Sunkien 于 2007-12-13 22:09 编辑 [/i]]

Sunkien 发表于 2007-12-13 22:09

/* Return nonzero value if X is not +-Inf or NaN.  */
4V*dlSgP9v # ifdef __NO_LONG_DOUBLE_MATH6h6C9b+n c!nQu
#  define isfinite(x) \
KVa
l7C9v:i{P      (sizeof (x) == sizeof (float) ? __finitef (x) : __finite (x))w6l`'rS`f
# else
F3b*Q gHj'I ^ #  define isfinite(x) \Mvpp
b"z kQ5qvc
     (sizeof (x) == sizeof (float)                                            \ sL?1PCG
      ? __finitef (x)                                                         \
)Qb.y0}Q3INz/z       : sizeof (x) == sizeof (double)                                         \8aR6}O.N.b:`*Q/o"I
      ? __finite (x) : __finitel (x))+t1wH7g}8Eo.X[
# endif#N}.f^rl7b

G5tZ(^z8H0G /* Return nonzero value if X is neither zero, subnormal, Inf, nor NaN.  */
.C%h!F'z-Tsy~k # define isnormal(x) (fpclassify (x) == FP_NORMAL)
U|{Z"E/Wf x peh-mZ!z
n
/* Return nonzero value if X is a NaN.  We could use `fpclassify' but4[&qIXLM {
   we already have this functions `__isnan' and it is faster.  */Kxmn Cj\
# ifdef __NO_LONG_DOUBLE_MATH
%_tT-D
?3q|2k #  define isnan(x) \
)j.U?De      (sizeof (x) == sizeof (float) ? __isnanf (x) : __isnan (x))
}8^bS8vV v&e # else
^5~ Rhb8Q#O f #  define isnan(x) \Z~.n-eDt
     (sizeof (x) == sizeof (float)                                            \
fsl&chmL;\/wB8XF       ? __isnanf (x)                                                          \|lb(}xb
      : sizeof (x) == sizeof (double)                                         \
n0^lYm k ];? [ u       ? __isnan (x) : __isnanl (x))#[~t$}?)V+c~]
# endif
5t3|,ov}HH*h
E_ -Wf?!y&D z
/* Return nonzero value is X is positive or negative infinity.  */6j8L%zp_3k8F.y
# ifdef __NO_LONG_DOUBLE_MATH k,fYq:S!Dp&e:R
#  define isinf(x) \EKx}+e`
     (sizeof (x) == sizeof (float) ? __isinff (x) : __isinf (x))%w2pGM+A _L
# else
"mKQq|#v#v,Z;iW0x #  define isinf(x) \
-pU5kQ8r#ag|6F.@)w      (sizeof (x) == sizeof (float)                                            \
wOVz?~Ab       ? __isinff (x)                                                          \
E*@Yjv1@%Q(KIC       : sizeof (x) == sizeof (double)                                         \ FT6YNQ
      ? __isinf (x) : __isinfl (x))
C(DddjNkW+T # endif
:xQ F M]#vf
*v TW4^qiu!R /* Bitmasks for the math_errhandling macro.  */
TD,E{3KX8n$R # define MATH_ERRNO     1       /* errno set by math functions.  */
#t\JHk@5a*r # define MATH_ERREXCEPT 2       /* Exceptions raised by math functions.  */
3Lr ~$t Bhk
N^d M
ah` #endif /* Use ISO C99.  */qD2Y8D:i
Y N"p:^2Z
#ifdef  __USE_MISC
~.k/o5r:]0n.^a /* Support for various different standard error handling behaviors.  */

[ `[5a$gSx1K:IN@$^t typedef enum
H&Q0O_T\ ^ W {
6F1Q#Y M.G)n4k   _IEEE_ = -1,  /* According to IEEE 754/IEEE 854.  */
{6Pht B ov   _SVID_,       /* According to System V, release 4.  */Wd'HEg'm
  _XOPEN_,      /* Nowadays also Unix98.  */
H-yu/a%U;svEI6jL@   _POSIX_,
&lv?b0a   _ISOC_        /* Actually this is ISO C99.  */;zdzLFZv
} _LIB_VERSION_TYPE;
M"Ng C@-}v 8cV}!{)uW/W
/* This variable can be changed at run-time to any of the values above toJe|~e%z9nN
   affect floating point error handling behavior (it may also be necessary2d.Hb;H@.D
   to change the hardware FPU exception settings).  */l T0]2W}c`
MM
extern _LIB_VERSION_TYPE _LIB_VERSION;
!`-_x,r$J3sGJ #endif
Z2MQQ*?F!?`8i
(hU8wZ)]+i5nbQ
l)Hk%O$oT joZ #ifdef __USE_SVID,m J1x9YZ
k%r
/* In SVID error handling, `matherr' is called with this description-]wC9qc9P7Q1xV&v+r
   of the exceptional condition.,y0q]0|CK

"kN!N%P'N)Ni:j$CU    We have a problem when using C++ since `exception' is a reserved
`"S1z`.X7}s\P    name in C++.  *//@2v)ByP0j
# ifdef __cplusplus
!} i z:yHv.gD1u struct __exception9F.i Cb7C7~5o*H'ZW
# else
HAx6Fo4~E]} struct exceptionW;f9?Sj)q
# endif
%D,d^Y|#uDt#O o   {#a/m{0bd-PwM,a
    int type;
W f%Zh-Vs:\N     char *name;jV~(E]
    double arg1;8e3xh\Dr&l9q
    double arg2;
:WFeC!x3ia     double retval;cD
bV]2\:d,y
  };vt ljSXWo

euTB&n:s$F:j2w # ifdef __cplusplus
HGS6Ki extern int matherr (struct __exception *__exc) throw ();
7OfpoSyF # else
.](^;sw_ extern int matherr (struct exception *__exc);
$M+G(J$o.S H # endif
}JZfyz)jh6p2C3P :Wa7y\p;d)H&H
V
# define X_TLOSS        1.41484755040568800000e+166T'Z c:NwNj

/b0p2Fh8Mz7te;BP$g /* Types of exceptions in the `type' field.  */
\AB K/fxREL # define DOMAIN         1
{g ['\KF4DA # define SING           2
xbr5e}$Ktf # define OVERFLOW       39~g}y
|OoE&{Vg
# define UNDERFLOW      4P5\bf2L
# define TLOSS          5|c$T6^:l6P_ X
# define PLOSS          6;n'_9H$n|{ h
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/* SVID mode specifies returning this large value instead of infinity.  */!o$v+x'[FU
# define HUGE           3.40282347e+38F f7iQd1z)ul!C\

UuTM[.e #else   /* !SVID */
`
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*G {aC's2r\ # ifdef __USE_XOPEN4V/X&_"H2i2q.c
/* X/Open wants another strange constant.  */
S+{,Q8ED(aj^7C #  define MAXFLOAT      3.40282347e+38F[+vwe9^k
# endif
t*^IDsT4~C
9j&~]r.Q #endif  /* SVID */
~E,Hu:E~}-Z -L"b5s7e2bd]i

/|L yXn f0FS /* Some useful constants.  */
VJ R xID[V #if defined __USE_BSD || defined __USE_XOPEN`_XL(AS
# define M_E            2.7182818284590452354   /* e */o6_!i?i
# define M_LOG2E        1.4426950408889634074   /* log_2 e */
6B4b0a1nRG|#Z # define M_LOG10E       0.43429448190325182765  /* log_10 e */
SQ4c6i
k:N&s.S # define M_LN2          0.69314718055994530942  /* log_e 2 */
H N ^i'y)d!v!g # define M_LN10         2.30258509299404568402  /* log_e 10 */6H#K[9Y&O O/L}
# define M_PI           3.14159265358979323846  /* pi */uTq:lxXn#[n
# define M_PI_2         1.57079632679489661923  /* pi/2 */
Jv a8f4U| # define M_PI_4         0.78539816339744830962  /* pi/4 */w*ZcR dPG
# define M_1_PI         0.31830988618379067154  /* 1/pi */0W9K5yY1RA:]5icp
# define M_2_PI         0.63661977236758134308  /* 2/pi */3jXU/J-A
# define M_2_SQRTPI     1.12837916709551257390  /* 2/sqrt(pi) */:G|0t"q? S"}I
# define M_SQRT2        1.41421356237309504880  /* sqrt(2) */G3]8t%a(P:I$Y
# define M_SQRT1_2      0.70710678118654752440  /* 1/sqrt(2) */0w+ZTNz
#endif|AvS7{ [O
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/* The above constants are not adequate for computation using `long double's.
5pv.^{-c;\c    Therefore we provide as an extension constants with similar names as a
zj9@b6cr    GNU extension.  Provide enough digits for the 128-bit IEEE quad.  */4x7e3cAV-E5]iE-s
#ifdef __USE_GNU6X;|!A n};S$X2Re
# define M_El           2.7182818284590452353602874713526625L  /* e */
kt's/]d4v a1t$j8r # define M_LOG2El       1.4426950408889634073599246810018921L  /* log_2 e */
lW\ ?+E4n:H6i+\0D7IY # define M_LOG10El      0.4342944819032518276511289189166051L  /* log_10 e */
1_o(l:B1kIf-e # define M_LN2l         0.6931471805599453094172321214581766L  /* log_e 2 */
/])HfL:l"]'EX # define M_LN10l        2.3025850929940456840179914546843642L  /* log_e 10 */
U-b4aV:Ey # define M_PIl          3.1415926535897932384626433832795029L  /* pi */
6Z"H!Q/k5l:X`H'V^ # define M_PI_2l        1.5707963267948966192313216916397514L  /* pi/2 */*uG+W+`"y
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# define M_PI_4l        0.7853981633974483096156608458198757L  /* pi/4 */
"|m/eCb@.k a # define M_1_PIl        0.3183098861837906715377675267450287L  /* 1/pi */f#} IRC*wP
# define M_2_PIl        0.6366197723675813430755350534900574L  /* 2/pi */
;f.B&_ cu # define M_2_SQRTPIl    1.1283791670955125738961589031215452L  /* 2/sqrt(pi) */#I/`%Xvi r g1`E
# define M_SQRT2l       1.4142135623730950488016887242096981L  /* sqrt(2) */
'@S UB*g0|2` # define M_SQRT1_2l     0.7071067811865475244008443621048490L  /* 1/sqrt(2) */
5rm9Qp(_N;t #endif&\7U oGuX;f`1SF

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/* When compiling in strict ISO C compatible mode we must not use the
8lg#A}-dw2P!v~    inline functions since they, among other things, do not set the
bvW8T+~P/[    `errno' variable correctly.  */*_!p;\HJ
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[5X y }3n;}9h7y-W$| # define __NO_MATH_INLINES      1
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   these operations.  Generic support in GCC for these as builtins went
,JtJW1KQ.N    in before 3.0.0, but not all cpus added their patterns.  We define
L R wN R    versions that use the builtins here, and <bits/mathinline.h> will
q*r,h&S!^$u    undef/redefine as appropriate for the specific GCC version in use.  */
,C2z4d:pY4k+M # define isgreater(x, y)        __builtin_isgreater(x, y)
%bCpui_%`!}jW%~ # define isgreaterequal(x, y)   __builtin_isgreaterequal(x, y)f/R:M8ur$d:q y3r
# define isless(x, y)           __builtin_isless(x, y)a6lf+l;|qNb
# define islessequal(x, y)      __builtin_islessequal(x, y)\k(E&Umm
# define islessgreater(x, y)    __builtin_islessgreater(x, y)
&Z CxB x%x%d # define isunordered(u, v)      __builtin_isunordered(u, v)
5]F STI #endif
&qD1t'l\
i F4T-I!N /* Get machine-dependent inline versions (if there are any).  */9UqNN5P0a1aH-S
#ifdef __USE_EXTERN_INLINES
gHXbZ # include <bits/mathinline.h>hz ]J*|1Z
#endif
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#ifdef __USE_ISOC99
3g(P3kKs"pk /* If we've still got undefined comparison macros, provide defaults.  */(Rr8Cj Q MO_c
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/* Return nonzero value if X is greater than Y.  */
E["u,{z6Bm:K4b*d # ifndef isgreater
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4Exx5^7Y   (__extension__                                                              \
y0?ZOl[u\_    ({ __typeof__(x) __x = (x); __typeof__(y) __y = (y);                       \:yJ8S|d^E0Wx
      !isunordered (__x, __y) && __x > __y; }))
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/* Return nonzero value if X is greater than or equal to Y.  */
'qWM:G*lu%EM # ifndef isgreaterequal
3v"|~:ILz"{ #  define isgreaterequal(x, y) \.s"J`-T1cD
  (__extension__                                                              \N(h$I%g R&F
   ({ __typeof__(x) __x = (x); __typeof__(y) __y = (y);                       \
A!fO&R)b*I       !isunordered (__x, __y) && __x >= __y; }))
/~I
oN8[~ V2pG&U # endifE)d#fU|XQB0?o

OCtOLgy_;K /* Return nonzero value if X is less than Y.  */
^.e3ZB j?$Kkgq/H # ifndef isless7^j"ZWXs(nP2\0I
#  define isless(x, y) \
0ED#R x9EA0vVA&l   (__extension__                                                              \
%d)eR%h+Q-[ t    ({ __typeof__(x) __x = (x); __typeof__(y) __y = (y);                       \(E^bT-g
      !isunordered (__x, __y) && __x < __y; }))
aIPm2Kk'm # endif
0[9wer c,T3l
POh#KQN /* Return nonzero value if X is less than or equal to Y.  */l*hI\ n+TQ/j1g
# ifndef islessequalOs3^1dRI W~x3W
#  define islessequal(x, y) \ p5n&ze7y/VT
  (__extension__                                                              \
wy3c!x s'W$g!\    ({ __typeof__(x) __x = (x); __typeof__(y) __y = (y);                       \
V,bkw;\       !isunordered (__x, __y) && __x <= __y; }))
#HgB!SlV`rH z # endif
T%Bc3i ze'rs b-R F#z;^5|
/* Return nonzero value if either X is less than Y or Y is less than X.  */
*s"Qy%Jp a o # ifndef islessgreater;rs
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#  define islessgreater(x, y) \
osCs*w+T   (__extension__                                                              \
Zef1]{~:l    ({ __typeof__(x) __x = (x); __typeof__(y) __y = (y);                       \
pxh9Z5u8I2l8h       !isunordered (__x, __y) && (__x < __y || __y < __x); }))
Q^(\E y6\wg # endif
9p``_*Rs)e {0}
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/* Return nonzero value if arguments are unordered.  */
;n#Xt2C6a6la,I # ifndef isunordered
W|*]5H eE5ea #  define isunordered(u, v) \4D[*eRfe
  (__extension__                                                              \j0RoN,wFP
   ({ __typeof__(u) __u = (u); __typeof__(v) __v = (v);                       \D|M.R'zH_3a
      fpclassify (__u) == FP_NAN || fpclassify (__v) == FP_NAN; }))clfd_
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# endifd|
\[\O
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#endif1j0_$H2?Fz

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6H&G:Ioa&gV'pK

O6q u i.A`)\Xkt|:G #endif /* math.h  */

Sunkien 发表于 2007-12-14 15:14

GG MM !!!help me

dearvoid 发表于 2007-12-17 09:25

可能移到别的头文件里面去了吧

dearvoid 发表于 2007-12-17 09:25

[quote][font=Courier][color=black][/color][color=blue]-(dearvoid@LinuxEden:Forum)-(~/tmp)-

_
BX pq5k"]+UnvO|ih [$$=3935 $?=0][/color] [color=red]; cat foo.c
G+a hP U*d [/color][color=black]#include <math.h>;Iod Q;xve!U
]d_Dz4__
int
r(z[8imBf-ec{ main(int argc, char *argv[])ryKff I"X
?WG
{@3l
JEUdmu
    return 0;
)A2L;d8\|XRW;\i }
+G2|MRq9^h [/color][color=blue]-(dearvoid@LinuxEden:Forum)-(~/tmp)-n*R"f\,X7ke {w
[$$=3935 $?=0][/color] [color=red]; gcc -M foo.c WJ&z8uu K3?(W#M
[/color][color=black]foo.o: foo.c /usr/include/math.h /usr/include/features.h \!X6{#A{*om5^
  /usr/include/sys/cdefs.h /usr/include/gnu/stubs.h \
km y8zp#ro q   /usr/include/bits/huge_val.h /usr/include/bits/mathdef.h \7p-d7tF5\%iBh
  /usr/include/bits/mathcalls.h
5Y `!_M N:v)z
Z"P [/color][color=blue]-(dearvoid@LinuxEden:Forum)-(~/tmp)-PQc#L6PJ
[$$=3935 $?=0][/color] [color=red]; bye T)B7L E#YF
[/color][color=black][/color][/font][/quote]

flag 发表于 2007-12-17 10:09

math.h头上有很多include的啊

candice208 发表于 2007-12-28 13:19

头文件就用math.h可以的7U s
o;\W3yw6Q:W+Q.u
你用 gcc -o  foo foo.c -lm 这个命令试一下
[M2o!y&S linux里面想用数学函数，这样就应该可以了
A"^+E `j\q 'v)r.}8X)qe3e5RXV\bn
[[i] 本帖最后由 candice208 于 2007-12-28 13:20 编辑 [/i]]

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