gcc 版本 4.1.2 20070925 (Red Hat 4.1.2-33)+^W$_%@-d8v#yP
4hlTAO        C@
math.h头文件中没有sqrt(),sin , atan , atan2 , cos , sin , tan等数学函数
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Jlwww.linuxeden.com
]t%ob\e请问这些函数在那个头文件中T"~;r.?bP8bW
谢谢！
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"tv+ac8cnG\Zwww.linuxeden.commath.h文件如下：www.linuxeden.com
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/* Declarations for math functions.
]4R/iqF)q#F,X!A;\        w   Copyright (C) 1991-1993, 1995-1999, 2001, 2002, 2004, 2006
.C,a
i.M4~tXTGd!_   Free Software Foundation, Inc.Q(HboN7e!xP'ds9M
   This file is part of the GNU C Library.Linux伊甸园论坛)?6X]Y9G-u
www.linuxeden.comU)AQz6s3T7L8d
   The GNU C Library is free software; you can redistribute it and/or|1gv-iX,g*V
   modify it under the terms of the GNU Lesser General Publicwww.linuxeden.com~MnO0vEUE5V
   License as published by the Free Software Foundation; either
Q;O        eg B+n&C   version 2.1 of the License, or (at your option) any later version.
a7C*EFOwww.linuxeden.comP a4Xq4tA.~B3J
   The GNU C Library is distributed in the hope that it will be useful,www.linuxeden.comB2`;ZO*D@]4Er gf
   but WITHOUT ANY WARRANTY; without even the implied warranty of
-FJ)b'@JD.y l0N*e   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
oIGD*stT   Lesser General Public License for more details.'g{)[u0TwMsz

|(Y)a%Ul
IA)tu
_www.linuxeden.com   You should have received a copy of the GNU Lesser General Public
1nQ*md]C8K"n   License along with the GNU C Library; if not, write to the Free@)Io+W8M
u
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MAY6\f.O'^7I-m ?p8s
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   02111-1307 USA.  */www.linuxeden.com3A.Y"xr\fbARQ4f
0o'xU$F?+Js#A%IbT@
/*8nG2S!sK
*      ISO C99 Standard: 7.12 Mathematics      <math.h>
~4J^4el;O|&tG */
r6q0^V[I
t'RLn        e#ifndef _MATH_H
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#include <features.h>U5W0J}
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__BEGIN_DECLS
2]by%]9D3h`Linux伊甸园论坛1z{6CZ4j.f1R,E
/* Get machine-dependent HUGE_VAL value (returned on overflow)..x(E}1Ng])i
   On all IEEE754 machines, this is +Infinity.  */
zHy7T!b [LLinux伊甸园论坛#include <bits/huge_val.h>}%A/w
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#ifdef __USE_ISOC99

jz a        o.sEwww.linuxeden.com# include <bits/huge_valf.h>
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o%T4N^S# include <bits/huge_vall.h>
OS;UTh#tLinux伊甸园论坛.F.[,r"R^o+b
/* Get machine-dependent INFINITY value.  */
(M7X:a9iw$ak n3T# include <bits/inf.h>"RV6ApZ7uIH
;r`/swN:aa2A
/* Get machine-dependent NAN value (returned for some domain errors).  */
1T9s_        pB,H9E]u# include <bits/nan.h>
3~N0AZV(P3Iwww.linuxeden.com#endif /* __USE_ISOC99 */2n p9g6@I#at

n&b2hN"keLLinux伊甸园论坛/* Get general and ISO C99 specific information.  */
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/* The file <bits/mathcalls.h> contains the prototypes for all the
4u\u{4Ri   actual math functions.  These macros are used for those prototypes,
'U#B)OT,czz   so we can easily declare each function as both `name' and `__name',D        z&^\m+\b+\
   and can declare the float versions `namef' and `__namef'.  */www.linuxeden.com.A h*e.FR0U
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#define __MATHCALL(function,suffix, args)       \
KU        }~E5KLinux伊甸园论坛  __MATHDECL (_Mdouble_,function,suffix, args)
[W:u
c;sQ L#define __MATHDECL(type, function,suffix, args) \H5f.Etx
  __MATHDECL_1(type, function,suffix, args); \
/f-S~!u'{Ey7qDK  __MATHDECL_1(type, __CONCAT(__,function),suffix, args)
4y0yQZZ
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0U'_[zi:thB7d"{"zLinux伊甸园论坛  __MATHDECLX (_Mdouble_,function,suffix, args, attrib)www.linuxeden.comqS [`EVm
#define __MATHDECLX(type, function,suffix, args, attrib) \9tr2f]
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zq5YQPkm  __MATHDECL_1(type, __CONCAT(__,function),suffix, args) __attribute__ (attrib)?.f1J)L}9kyF
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l)^[^-G E# define _Mdouble_BEGIN_NAMESPACE __BEGIN_NAMESPACE_STDwww.linuxeden.comU%lJ8g+R'm
# define _Mdouble_END_NAMESPACE   __END_NAMESPACE_STD7bUL6n1X/['eQC
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m#_0S
bgHwww.linuxeden.com#undef  _Mdouble_JN
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\C;C9w#m6p ]9fwww.linuxeden.com#undef _Mdouble_END_NAMESPACE
*o+d5|0\`#undef  __MATH_PRECNAMEkwvPhM!B`

$Cs1i8kL-W`yLinux伊甸园论坛#if defined __USE_MISC || defined __USE_ISOC998Zvm-x
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www.linuxeden.com(~)m;Xmy0WpB

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4dQ        \Euwww.linuxeden.com# undef __MATH_PRECNAME
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9N6`|o2]7C2VTwww.linuxeden.com
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/`_*Z,b&?*]1hb8Z                              nextafter) __attribute__ ((__const__));
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   instead of `double' and appending l to each function name.  */
Zy4Q3Q7~*J[&S!M.uCwww.linuxeden.comwww.linuxeden.com-O#tyonO
#   undef __MATHDECL_13No[sh['\!z
#   define __MATHDECL_2(type, function,suffix, args, alias) \D)~'N]RTGez
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$r@;N_qS?4DV
j*Mwww.linuxeden.com#  endif
)Cg@a:n0dWCLinux伊甸园论坛#R#yp.rY
#  ifndef _Mlong_double_
dVu4D5J+E7S4A*R#   define _Mlong_double_       long double
)L?_XvZ#  endif$n\ Paf\;z:z$fA
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#  ifdef __STDC__Y1^-R4tS${1N3ge K
#   define __MATH_PRECNAME(name,r) name##l##r
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9f~Z*G        Yl1^!H*u#   define __MATH_PRECNAME(name,r) name/**/l/**/r

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#  define _Mdouble_BEGIN_NAMESPACE __BEGIN_NAMESPACE_C99
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#  include <bits/mathcalls.h>Linux伊甸园论坛(o$vZ/T}~Aw
#  undef _Mdouble_
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#undef  __MATHDECL
2Bu}E:[E Awww.linuxeden.com#undef  __MATHCALL
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#if defined __USE_MISC || defined __USE_XOPEN
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extern int signgam;Linux伊甸园论坛6D5oTP^ @
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#ifdef __USE_ISOC99
$TE~)i~|uwww.linuxeden.com
#N$iap;CW/* Get the architecture specific values describing the floating-point
[2^)NHX}^   evaluation.  The following symbols will get defined:
#zO        ipk{rDwww.linuxeden.com'lY,|3U~8g4n$Ua
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                  1     if `float_t' and `double_t' are `double'1on!K3W4Y"~
                  2     if `float_t' and `double_t' are `long double'
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E(Z8IJF w}p"|?www.linuxeden.com    INFINITY    representation of the infinity value of type `float'
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Frvve9Hwww.linuxeden.com    FP_FAST_FMA
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!oEW        E3DR5]1o    DECIMAL_DIG Number of decimal digits supported by conversion between4SjZ+m9T
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    FP_NAN,1L-@O~XH(l3^U:K
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f%Y#O%Tc1g1Cwww.linuxeden.com    FP_ZERO,Linux伊甸园论坛1dJc        VC1z G
# define FP_ZERO FP_ZERO
/e}$["z)BUYLinux伊甸园论坛    FP_SUBNORMAL,UA#I
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/* Return number of classification appropriate for X.  */F]fP+~'O
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        @Q:HyD$C(L;T#  define signbit(x) \xk:h vL$K5i
     (sizeof (x) == sizeof (float) ? __signbitf (x) : __signbit (x))
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# endif        FZ1t+]0Zj)x

P|t"G9zC9sqO)R\2k[ 本帖最后由 Sunkien 于 2007-12-13 22:09 编辑 ]

/* Return nonzero value if X is not +-Inf or NaN.  */
YOw)L)`# ifdef __NO_LONG_DOUBLE_MATHs3pZX!P6gH3Y
#  define isfinite(x) \www.linuxeden.com*Vvjx5D1bL
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/* Return nonzero value if X is neither zero, subnormal, Inf, nor NaN.  */
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   we already have this functions `__isnan' and it is faster.  */www.linuxeden.com.l1n/A(e'L5dcm)B
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# endif"h[0CFx]7G8nT

1E-mTv6nO        w/* Bitmasks for the math_errhandling macro.  */Z6E@:c*RJvs
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;_~1z;{}:Ywww.linuxeden.com
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3vC        F/M_A/* Support for various different standard error handling behaviors.  */
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}!BO6P(bn7S&T2lLinux伊甸园论坛#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
%oEy9a0J你用 gcc -o  foo foo.c -lm 这个命令试一下
1\6j
}q9wD(^0Olinux里面想用数学函数，这样就应该可以了
_%@,j.\&BALinux伊甸园论坛
/Wa;@cS;c6Pg.Q9[5S[ 本帖最后由 candice208 于 2007-12-28 13:20 编辑 ]