[LCP]Rounding questions

[Muli Ben-Yehuda]

On Thu, Sep 05, 2002 at 05:45:44AM -0400, Chuck Martin wrote:
> On Thu, Sep 05, 2002 at 10:12:55AM +0100, Vincent Penquerc'h wrote:
> > You've linked libm.a in, did you (-lm) ?
> 
> Thanks.  How did I miss the obvious?  The results are still strange:
> 
> 	chuck at zeta:~$ cat roundtest.c
> 	#include <stdio.h>
> 	#include <math.h>
> 
> 	int main()
> 	{
>     		printf("%f\n", round((double) 390.0));
> 	}
> 	chuck at zeta:~$ gcc -lm -o roundtest roundtest.c
> 	chuck at zeta:~$ ./roundtest
> 	2.896811
> 	chuck at zeta:~$
> 
> Why is it rounding 390.0 and getting 2.896811?

because round returns a double and you're printing a float... 

-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 189 bytes
Desc: not available
Url : http://lists.linux.org.au/pipermail/linuxcprogramming/attachments/20020905/8ebacaaf/attachment.pgp