Question

I am using rand() function, but it always uses the same random sequence. Is there a random function that seeds with the clock value? And how would I do this?

Answer 1

You are meant to seed rand() and random() (slightly bigger space) yourself, with their respective seed functions, before using them. You can use the time, or whatever other value you desire:

srand(time(0));
srandom(time(0));

Here we get the system time; obviously passing a constant will produce the same sequence every run.

You can also use arc4random() which generates very high-quality random bits and seeds itself using /dev/random.