Dice roller

[jpotts]

Hi,
I have made a simple dice roller, however each time i run the code it always comes up with the same number, how do i avoid this?
The code is:

#include <iostream>
#include <cstdlib>

int main()
{
	int d20;
	d20 = (rand() % 20)+1;
	std::cout << d20;
	
	return 0;
}

[Athar]

You need to initialize the pseudo-random number generator. See here:
http://www.cplusplus.com/reference/clibrary/cstdlib/srand/

[jpotts]

Awesome, I used the time as my seed. What other things could be used instead though?

[Athar]

Anything that changes frequently and (preferably) doesn't often repeat any values should work.
time() is almost universally used because it fulfills both criteria.
Other time-based functions work well too (like the lower bits of rdtsc), but time(0) is portable.