gcc 版本 4.1.2 20070925 (Red Hat 4.1.2-33)
;^5nA1Rjwww.linuxeden.comUB.n4?V%t*y        R
math.h头文件中没有sqrt(),sin , atan , atan2 , cos , sin , tan等数学函数
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请问这些函数在那个头文件中
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Aq9dN[math.h文件如下：Linux伊甸园论坛R(Nj&G8f
/* Declarations for math functions.
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zc   Copyright (C) 1991-1993, 1995-1999, 2001, 2002, 2004, 2006
(Em        g3l.VY.Lu/S   Free Software Foundation, Inc.i4KO1L
h
   This file is part of the GNU C Library.lo3t?R B

kGbh_"n2wq   The GNU C Library is free software; you can redistribute it and/orLinux伊甸园论坛h|^"\BW{!c
   modify it under the terms of the GNU Lesser General PublicN~7]-])](f s{
   License as published by the Free Software Foundation; eitherLinux伊甸园论坛%I(V:E!{j
c
   version 2.1 of the License, or (at your option) any later version.z4A]N6T|+B

S3G/k4n6Z7P3H   The GNU C Library is distributed in the hope that it will be useful,
)Px,|u0o        O'Q   but WITHOUT ANY WARRANTY; without even the implied warranty ofp"w:_7]"p4\@9T
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
e:^L,Jd;@
Ky   Lesser General Public License for more details.
HN`_.?www.linuxeden.com
yV'x`FL%WU\   You should have received a copy of the GNU Lesser General Public
h!F
{
L9S8z1Vg;J ]LQwww.linuxeden.com   License along with the GNU C Library; if not, write to the Free%l}%p;^N$om,K
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
cB3~Nu)QM
T:c1r   02111-1307 USA.  */
e-p,TB0GD
2b~1Y2L/\,h;h`(H/*
YI,M"H&mn:H\k,m *      ISO C99 Standard: 7.12 Mathematics      <math.h>www.linuxeden.comp%zQ!B        E        [
*/&b9bH
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.}A'g&H"S'vZ1r@
#ifndef _MATH_HLinux伊甸园论坛[P+q:oC
#define _MATH_H 1www.linuxeden.com*RhZ.Gp'NQ!v

1n:Qga iUN8f Vwww.linuxeden.com#include <features.h>
}qi%H!rnwww.linuxeden.com
q$C
_&bw4x__BEGIN_DECLS
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/* Get machine-dependent HUGE_VAL value (returned on overflow).Linux伊甸园论坛|$@)x        L+lN        HI
   On all IEEE754 machines, this is +Infinity.  */www.linuxeden.com!q!@J#TTO
#include <bits/huge_val.h>
(M5~]]R        e:pu#ifdef __USE_ISOC99
k;{qV-JO9Ol
j}# include <bits/huge_valf.h>
vEq$i*oCp# include <bits/huge_vall.h>/p;D        J.zHNn&o#s2\

.kgW{VSK/* Get machine-dependent INFINITY value.  */
JX*`9nJ}:y rD4uwww.linuxeden.com# include <bits/inf.h>Linux伊甸园论坛z'DNT2jx~7S:p4Q

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Cr3x%}.a"})\Linux伊甸园论坛/* Get machine-dependent NAN value (returned for some domain errors).  */www.linuxeden.comDX J1Ii
# include <bits/nan.h>
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/* Get general and ISO C99 specific information.  */www.linuxeden.com&UG4C$G7A
#include <bits/mathdef.h>
? I2nS I9L
HFyHS|_Wn/* The file <bits/mathcalls.h> contains the prototypes for all thewww.linuxeden.com1Oi)e(pz8z
   actual math functions.  These macros are used for those prototypes,
$Mn*i9C/X QY;B   so we can easily declare each function as both `name' and `__name',-Dl;P.n7V3T`'l
   and can declare the float versions `namef' and `__namef'.  */&N)AJ,N6wj

x4xf5KU v7y!s.k#define __MATHCALL(function,suffix, args)       \X7l!|JGjU
  __MATHDECL (_Mdouble_,function,suffix, args)K*l5sp1q?q5]|^
#define __MATHDECL(type, function,suffix, args) \%^Rwi
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9OO-F0nr Ga  __MATHDECL_1(type, __CONCAT(__,function),suffix, args)
ln(d8ZT5ZLinux伊甸园论坛#define __MATHCALLX(function,suffix, args, attrib)      \

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#F
JYc?I8_2WFMwww.linuxeden.com#define __MATHDECLX(type, function,suffix, args, attrib) \xn],Xp
  __MATHDECL_1(type, function,suffix, args) __attribute__ (attrib); \
8f1V&];q8QP        jwww.linuxeden.com  __MATHDECL_1(type, __CONCAT(__,function),suffix, args) __attribute__ (attrib)
#eg
w|&R1eG*a#define __MATHDECL_1(type, function,suffix, args) \
Q9R
DQ        {-xh]s_/Ndwww.linuxeden.com  extern type __MATH_PRECNAME(function,suffix) args __THROW
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(a Z"Mel&P6rV!oLinux伊甸园论坛#define _Mdouble_               doubleLinux伊甸园论坛\*W'ODo9{1N{4a
#define __MATH_PRECNAME(name,r) __CONCAT(name,r)w*U        v'Q
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# define _Mdouble_BEGIN_NAMESPACE __BEGIN_NAMESPACE_STD
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d/`_k5`        E%~XMKwww.linuxeden.com#include <bits/mathcalls.h>www.linuxeden.comc(N}4y)k
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#undef  _Mdouble_www.linuxeden.com        Y]&z4^u
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#undef _Mdouble_END_NAMESPACE;n
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/{W7syIi7C   instead of `double' and appending f to each function name.  */Linux伊甸园论坛_
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# ifndef _Mfloat_www.linuxeden.comO*p0y*g`6l;[0f-\
#  define _Mfloat_              float[(U|C'wQ*}i
# endif
kAiL#@Twww.linuxeden.com# define _Mdouble_              _Mfloat_,H4U1c rg
# ifdef __STDC__?X5t:N7yya:k2U
#  define __MATH_PRECNAME(name,r) name##f##r
:G)ZOy-w(n#gPLinux伊甸园论坛# else
wA Sb9E8O!y#  define __MATH_PRECNAME(name,r) name/**/f/**/rk2WCkn3dw[
# endif!l8D2A%e&ZS6s"h
# define _Mdouble_BEGIN_NAMESPACE __BEGIN_NAMESPACE_C99
0oY        gx2D'I)Lwww.linuxeden.com# define _Mdouble_END_NAMESPACE   __END_NAMESPACE_C99
pa5T~1@3c$`0n,K(h# include <bits/mathcalls.h>2`(Ga"m%H(QJ3pG0@*Gl
# undef _Mdouble_O'{*Wo'L)x^
# undef _Mdouble_BEGIN_NAMESPACE
3Z6k"Rh.Jf# undef _Mdouble_END_NAMESPACE
"m%kz8K5Q6R.Jwww.linuxeden.com# undef __MATH_PRECNAME
        ?#w[o7cp_.YLinux伊甸园论坛o(rzN;Qp]*h
# if (__STDC__ - 0 || __GNUC__ - 0) \Linux伊甸园论坛^YP4x2{(q7I
     && (!defined __NO_LONG_DOUBLE_MATH || defined __LDBL_COMPAT)
9^R*SIDQS!Q#  ifdef __LDBL_COMPAT
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extern float __nldbl_nexttowardf (float __x, long double __y)Linux伊甸园论坛Y8O!V}Fx)k
                                  __THROW __attribute__ ((__const__));CAn'ozUJjQ
#    ifdef __REDIRECT_NTH
Y`%NODA$N-jTextern float __REDIRECT_NTH (nexttowardf, (float __x, long double __y),`|;C*V|^0r        i
                             __nldbl_nexttowardf)
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@$U#[Linux伊甸园论坛extern double __REDIRECT_NTH (nexttoward, (double __x, long double __y),www.linuxeden.com3G6N9Ps!N,{
                              nextafter) __attribute__ ((__const__));Km"K.Htx
extern long double __REDIRECT_NTH (nexttowardl,www.linuxeden.comvYf9X0dCz
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                                   (long double __x, long double __y),Hp7M        D:Ma
                                   nextafter) __attribute__ ((__const__));

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~c4uXRLinux伊甸园论坛#    endif
7Z;J~lS&m{r$eSCT?#   endif
]&Z1s.o7Qd/kz1n;zLinux伊甸园论坛www.linuxeden.com(td9r
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/* Include the file of declarations again, this time using `long double'
P I%GZ)Rw   instead of `double' and appending l to each function name.  */
jN7q5|%KLinux伊甸园论坛
!l:F}'f\        ix#   undef __MATHDECL_1Ff!G!N$G?)A`_e
#   define __MATHDECL_2(type, function,suffix, args, alias) \EN5SfO1l3`
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  extern type __REDIRECT_NTH(__MATH_PRECNAME(function,suffix), \n)`!R:Z
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                             args, alias)
C\,Q2~0rd%R        iLinux伊甸园论坛#   define __MATHDECL_1(type, function,suffix, args) \Linux伊甸园论坛qT@3E\
N^bo
  __MATHDECL_2(type, function,suffix, args, __CONCAT(function,suffix))

n6LLn2ARla#  endif+l2p*h
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www.linuxeden.com
_WG_0Xzj3VJu6j8r
#  ifndef _Mlong_double_
6rWlm#W%b#   define _Mlong_double_       long double
\
t#Bh2Pu#  endif
5wx        BvGULinux伊甸园论坛#  define _Mdouble_             _Mlong_double_
Cq@^7kXzY#  ifdef __STDC___6N-p
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#   define __MATH_PRECNAME(name,r) name##l##r6a$}F
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#  else&]C%K6z$o;i8t
#   define __MATH_PRECNAME(name,r) name/**/l/**/rLinux伊甸园论坛0t6]GQ,j3h.v
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#  endif        D*f%Y%g1IJ8n
#  define _Mdouble_BEGIN_NAMESPACE __BEGIN_NAMESPACE_C994a.Oxn{q(\
#  define _Mdouble_END_NAMESPACE   __END_NAMESPACE_C99Linux伊甸园论坛xCIj        g
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#  include <bits/mathcalls.h>
9u~)kW[uswww.linuxeden.com#  undef _Mdouble_
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Bg/t%h'?$w5T.\fLinux伊甸园论坛# undef _Mdouble_BEGIN_NAMESPACE
F-K0\(t7oq d5Kz# undef _Mdouble_END_NAMESPACEwww.linuxeden.com,R
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a6K        yK P^1A _%V)QLinux伊甸园论坛
~%}*VZ6A~.Hwww.linuxeden.com#endif  /* Use misc or ISO C99.  */
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#undef  __MATHDECL
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/* This variable is used by `gamma' and `lgamma'.  */www.linuxeden.com.xi*z
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extern int signgam;
}!z~J+?#endif
:h        QU$[hIw;D%E2W2Zo!Z#J6h%B.g$Z.@
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/* ISO C99 defines some generic macros which work on any data type.  */Linux伊甸园论坛^0aZJF^R+Q^'q
#ifdef __USE_ISOC99XaPC-Fq/y

8P
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*DM0pI|   evaluation.  The following symbols will get defined:$E3QPY1O"ViO
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    float_t     floating-point type at least as wide as `float' used
;r"v8i%cLk                to evaluate `float' expressions
0gfH&O@(P@    double_t    floating-point type at least as wide as `double' usedwww.linuxeden.com
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                to evaluate `double' expressions-Jwl[\

.}.QXk,E,zyA1ELinux伊甸园论坛    FLT_EVAL_METHOD
yM8J(GLGVT                Defined tof~7\:j rf2IH
                  0     if `float_t' is `float' and `double_t' is `double'
^)VU6^-E1ALinux伊甸园论坛                  1     if `float_t' and `double_t' are `double'
!dq;SCF[                  2     if `float_t' and `double_t' are `long double'Di
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                  else  `float_t' and `double_t' are unspecified
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    INFINITY    representation of the infinity value of type `float'
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uwww.linuxeden.com    FP_FAST_FMA%K(O2}2s2Q:K
    FP_FAST_FMAF
7l2f{6[.rpwww.linuxeden.com    FP_FAST_FMAL
1MdB8\R2I.|BLinux伊甸园论坛                If defined it indicates that the `fma' function
l?PSs                generally executes about as fast as a multiply and an add.
K"[J(H0wU                This macro is defined only iff the `fma' function is
*x*\0p/r"SxLinux伊甸园论坛                implemented directly with a hardware multiply-add instructions.WMX,j9k
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    FP_ILOGB0   Expands to a value returned by `ilogb (0.0)'.
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9J        S^]a'FPqLinux伊甸园论坛v+Q:S2o        }V
    DECIMAL_DIG Number of decimal digits supported by conversion between

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rwX}F+W)O;CLinux伊甸园论坛*/1n/qax        `ys(?S!n

[1TTf!dX)sf8Hwww.linuxeden.com/* All floating-point numbers can be put in one of these categories.  */www.linuxeden.com:Ct.km3j:e.}-e,I)K
enumwww.linuxeden.comu5nt        N/Lm
  {
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F}"Fb"f    FP_NAN,4p0d&z;|3NY
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# define FP_NAN FP_NANUq0V
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    FP_INFINITE,Linux伊甸园论坛~+L;h5Y7aZL
# define FP_INFINITE FP_INFINITE
6LpT b        X^/iX_Z    FP_ZERO,www.linuxeden.comKL}%LK"q*nxe
# define FP_ZERO FP_ZEROwww.linuxeden.com        F'I%ZS2D'J_&PO
    FP_SUBNORMAL,
9K%P9OK2fT        A# define FP_SUBNORMAL FP_SUBNORMAL9G
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# define FP_NORMAL FP_NORMALe+T9Jk%njE
  };
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/* Return number of classification appropriate for X.  */www.linuxeden.comtv"fUa
# ifdef __NO_LONG_DOUBLE_MATHwww.linuxeden.com!qIf)T{?
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#  define fpclassify(x) \
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# elsewww.linuxeden.come+DM3c
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#  define fpclassify(x) \
}\#e8{#z-Mz/h     (sizeof (x) == sizeof (float)                                            \\*a)Kl]k:K5U1H.m
      ? __fpclassifyf (x)                                                     \
!e#xO1{hvy+xwww.linuxeden.com      : sizeof (x) == sizeof (double)                                         \
Q9_)r:^,`,q      ? __fpclassify (x) : __fpclassifyl (x))
+y'h8L4Fh"{2Y# endifLinux伊甸园论坛.r3b,e2crm3L

;t|,v%h;[4Q Lz/* Return nonzero value if sign of X is negative.  */x$]/D7s;?;xlS1s9XZ
# ifdef __NO_LONG_DOUBLE_MATH
'AP8sPs3S#  define signbit(x) \Linux伊甸园论坛ecseJM!Y
     (sizeof (x) == sizeof (float) ? __signbitf (x) : __signbit (x))
dK$]2c,h# else        |}l?$WWi,Er
#  define signbit(x) \Linux伊甸园论坛k0|}T \~U.l!c,m F-EO
     (sizeof (x) == sizeof (float)                                            \!n(F0~%Dx)v$|5a~r
      ? __signbitf (x)                                                        \
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6LM8xc+RBLinux伊甸园论坛# endif6Ei;z~;\\tz?(d

@joGO~$J7S[ 本帖最后由 Sunkien 于 2007-12-13 22:09 编辑 ]

/* Return nonzero value if X is not +-Inf or NaN.  */(OA_
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# ifdef __NO_LONG_DOUBLE_MATH.]qQ`#}%p-bT
#  define isfinite(x) \
W9ErMc8\o     (sizeof (x) == sizeof (float) ? __finitef (x) : __finite (x))x\l!Jb*P"R
# elseg\!wq,kO0EWQ%y
#  define isfinite(x) \Linux伊甸园论坛 V0vf.d"qNb
s
     (sizeof (x) == sizeof (float)                                            \*u]n`j&zLH)x+F
      ? __finitef (x)                                                         \"BY
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      : sizeof (x) == sizeof (double)                                         \
w1O7WX*[$fnLinux伊甸园论坛      ? __finite (x) : __finitel (x))
x0r)F}o]www.linuxeden.com# endif
q1^/VW@3W^www.linuxeden.com9m ORd$R[x
/* Return nonzero value if X is neither zero, subnormal, Inf, nor NaN.  */
x"J9PJ$u!t%dTO9]# define isnormal(x) (fpclassify (x) == FP_NORMAL)
:x0oS:If7c3m'H3e
BL%qH6A*Q[(g/* Return nonzero value if X is a NaN.  We could use `fpclassify' butwww.linuxeden.comdykOFx:_NfS,{
   we already have this functions `__isnan' and it is faster.  */
0yK0Zt|Linux伊甸园论坛# ifdef __NO_LONG_DOUBLE_MATH
we7{0w2C&zwww.linuxeden.com#  define isnan(x) \
1@#R{[6g'L        `/d
?www.linuxeden.com     (sizeof (x) == sizeof (float) ? __isnanf (x) : __isnan (x))
/_
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#  define isnan(x) \P
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Eth(Iei6a-u2N      : sizeof (x) == sizeof (double)                                         \Linux伊甸园论坛@7Y4w#P;PK7uh
      ? __isnan (x) : __isnanl (x))www.linuxeden.coma"PD&gdI
# endif
&^at#F+ck6v2E3mv3x
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/* Return nonzero value is X is positive or negative infinity.  */LEf7y:^Nav/Q |$_
# ifdef __NO_LONG_DOUBLE_MATH

c0bIE*SeQ@
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     (sizeof (x) == sizeof (float) ? __isinff (x) : __isinf (x))ID
](ju*LQ$Y%T
# else
hZ{e^x9X"aLinux伊甸园论坛#  define isinf(x) \:lc-K"SL~$GGf0S1l:u
     (sizeof (x) == sizeof (float)                                            \
l2p#\        c;Gz3i:_
rJwww.linuxeden.com      ? __isinff (x)                                                          \www.linuxeden.com&wN)@[^:j
      : sizeof (x) == sizeof (double)                                         \
Uk!^0Vq&jLinux伊甸园论坛      ? __isinf (x) : __isinfl (x))_;l6lI~@/pa]
# endifLinux伊甸园论坛)n/~mf(i:d
Linux伊甸园论坛4C7Cx Wd.X9V-A
/* Bitmasks for the math_errhandling macro.  */-r8In\4O-n*g
{DD1X
# define MATH_ERRNO     1       /* errno set by math functions.  */
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;W)_'D&W*Q,y/x)N#endif /* math.h  */

GG MM !!!help me

可能移到别的头文件里面去了吧

math.h头上有很多include的啊

头文件就用math.h可以的
3G,Bt U+W3P你用 gcc -o  foo foo.c -lm 这个命令试一下www.linuxeden.com1mYiD$gx1n
linux里面想用数学函数，这样就应该可以了
:u@!BaI0fRLinux伊甸园论坛
dq@TII-u[ 本帖最后由 candice208 于 2007-12-28 13:20 编辑 ]