Hi folks,
I'm trying to learn C using the K&R book. I wrote the following code to
test something they are mentioning in chapter 2.7, but I can't compile
it.
#include <stdio.h>
#include <math.h>
int main(int argc, char argv[])
{
int i = 4;
printf("Int: %f, Double: %f\n", sqrt(i), sqrt((double) i));
return 0;
}
This is the output I get by gcc:
18:29 [EMAIL PROTECTED]:~/Projekte/c/2 $ gcc -o test test.c
/tmp/ccc01936: In function `main':
/tmp/ccc01936(.text+0x17): undefined reference to `sqrt'
/tmp/ccc01936(.text+0x2e): undefined reference to `sqrt'
18:30 [EMAIL PROTECTED]:~/Projekte/c/2 $
When I looked into /usr/include/math.h there was no definition of
sqrt(). Instead there were some constants defined such as:
#define M_2_SQRTPI 1.12837916709551257390 /* 2/sqrt(pi)
*/
I looked into /usr/doc/libc6-dev/changelog.gz and there is the entry:
1997-03-04 19:14 Andreas Schwab
<[EMAIL PROTECTED]>
* sysdeps/m68k/fpu/__math.h: Update feature tests.
(fabs): Remove defininition, it is a gcc builtin.
(sqrt, __sqrt): Remove definition, they have wrappers in libm.
But I can't find any libm in dselect. This is still on a slink machine,
I haven't come around to upgrading to potato yet.
Anybody who can help me, getting sqrt() to work? Or is my code
incorrect?
TIA,
Viktor
--
Viktor Rosenfeld
E-Mail: mailto:[EMAIL PROTECTED]
HertzSCHLAG: http://www.informatik.hu-berlin.de/~rosenfel/hs/
