I cannot use the math funciton,such as log()

["Tan Ping" <tp2008 at gmail dot com>]

Hi,
 When I use the math function , the program can be complied
successfully.But when I download it into the s3c2410 board and run it,
the result is wrong?
 What is the matter? Can you help me?
 I use the arm-linux-gcc-2.95.3,
the code is :
#include <math.h>
#include <stdio.h>
int main()
{
  float a,b;
  a=4.0;
  b=log(a);
  printf("a=%f,b=%f\n",a,b);
}
The result of running is:
a=4.0,b=4.0
the b's value is wrong!

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