If I don't specify srand(), what seed does rand() use?

Question

Here is the code:

#include 
#include 
#include 

int main(void)
{
    int r;
    int i;
    for (i = 0; i < 1         


        

Answer 1

If rand() is called before any calls to srand() are made, the same sequence shall 
be generated as when srand() is first called with a seed value of 1.

Ref:

http://pubs.opengroup.org/onlinepubs/009695399/functions/rand.html