/**

* Simple random number generator

* Code adapted from OOP class slides.

* @author Felipe Scrochio Custódio

*/

import java.util.Calendar;

public class Random {

private long p = 2147483648l;

private long m = 843314861;

private long a = 453816693;

private long xi = 1023;

/**

* Returns a random number in the interval (0,1[

* @return Random number

*/

public double getRand() {

xi = (a + m * xi) % p;

double d = xi;

return d / p;

}

/**

* Returns a random int in the interval (0,max[

* @param max - Limit

* @return Random number

*/

public int getIntRand(int max) {

double d = getRand() * max;

return (int) d;

}

/**

* Allows changing the seed for the random number generator.

* @param seed - the new value for the seed

*/

public void setSemente(int seed) {

xi = seed;

}

/**

* Constructor that allows setting the seed beforehand

* @param k - Initial value for the seed

*/

public Random(int k) {

xi = k;

}

/**

* Constructor that uses a random seed, generated by getting the current time in the machine (millisseconds)

*/

public Random() {

xi = Calendar.getInstance().getTimeInMillis();

}

}