Easy Question

[Ilya020]

I was doing some tests when I noticed the following code wouldnt compile:

#include <stdio.h>
#include <math.h>

main()
{

     double foo=sqrt(900.0);

     printf("%.2f", foo);

     return 0;
}

I am using gcc with Slackware 8.1. I asked a friend on a windows box also using gcc with Windows. It compiled fine on his and ran fine. What going on here?

Ilya.

[Ilya020]

solved my own problem:

gcc foo.c -lm

Ilya.