// Understanding rand() and srand()
// Pseudorandom numbers and seeds
// Written by Lee Devlin 04-06-2011
// the rand() function generates a pseudorandom sequence, if you want to make it change
// each time the program is run, you need to seed it with a number that keeps changing
// The time(0) function is most often used for this purpose.
// This program illustrates the issue of running srand() continuously, which can produce
// very undesirable results. 

#include <iostream>
using namespace std;



int main()
{
	for(int i=0; i<10; i++)
	{
		srand(time(0)); // This will not have the desired effect because time changes once per second
		                // and this loop executes much faster than that.
		int r = rand();
		cout << "random number "<< i <<" is " << r << " time is " << time(0) << endl;
	}
	system("pause");
}