[ale] Missing "floor"?

[Sparr]

math.h only declares the function. The implementation is in /var/lib/libm
(math lib). You need to tell the compiler to link to that with -lm
On Jun 19, 2013 10:52 AM, "leam hall" <leamhall at gmail.com> wrote:

> Morning Ed!
>
> I'm looking around (googling) to understand what you mean and I'm not
> getting it. math.h is included in the program and exists in /usr/include.
>
> Leam
>
>
>
> On Wed, Jun 19, 2013 at 10:30 AM, Ed Cashin <ecashin at noserose.net> wrote:
>
>> Maybe link the math library?  A quick check suggests that's it.
>>
>> [ecashin at marino ~]$ man floor | grep Link
>>        Link with -lm.
>> [ecashin at marino ~]$
>>
>>  On Wed, Jun 19, 2013 at 10:18 AM, leam hall <leamhall at gmail.com> wrote:
>>
>>>  Not sure why I'm getting:
>>>
>>> gcc -Wall -Werror -o rand rand.c
>>> /tmp/ccAJ7e8S.o: In function `main':
>>> rand.c:(.text+0x16): undefined reference to `floor'
>>> collect2: ld returned 1 exit status
>>>
>>> ###
>>> rand.c
>>> ###
>>>
>>> #include <stdio.h>
>>> #include <unistd.h>
>>> #include <stdlib.h>
>>> #include <math.h>
>>>
>>> int main(void) {
>>>
>>>     int num;
>>>     float val = 2.3;
>>>     num = floor(val);
>>>     printf("num is %d.\n", num);
>>>
>>>     return 0;
>>> }
>>>
>>> --
>>> Mind on a Mission <http://leamhall.blogspot.com/>
>>>
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>>>
>>
>
> --
> Mind on a Mission <http://leamhall.blogspot.com/>
>
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