import java.util.*;


public class Randomizer {
	
	// Instance Variable:
	private Random rand; 
	
	// Constructor Methods:
	
	public Randomizer () {
		rand = new Random();
	}
	
	public Randomizer (long seed) {
		rand = new Random(seed); // Set seed for repeatability.
	}
	
 	// Instance Methods:
 	
 	public boolean flip () {
  	return intBetween(0,1) == 0;
  }
  
  public boolean chances(int part, int whole) {
  	// Returns true with probability part out of whole.
  	return intBetween(1, whole) <= part;
  }
  
  public boolean chances(double prob) {
  	// Returns true with probability part out of whole.
  	int large = Integer.MAX_VALUE;
  	return intBetween(1, large) <= (int) (prob * large);
  }


  public int intBetween (int lo, int hi) {
  	int result = lo + (Math.abs(rand.nextInt()) % (hi + 1 - lo));
  	// System.out.println("intBetween(" + lo + ", " + hi + ") = " + result);
    return result;
  }
  
   public int evenBetween (int lo, int hi) {
  	// Assume hi > lo. 
  	// Return an even number between lo and hi, inclusive;
  	int evenLo, evenHi;
  	if (isEven(lo))
 			evenLo = lo;
 		else
 			evenLo = lo + 1;
 		if (isEven(hi))
 			evenHi = hi;
 		else
 		  evenHi = hi - 1;
 		return evenLo + (2 * intBetween(0, (evenHi - evenLo) / 2));
 	}
 	
 	public int oddBetween (int lo, int hi) {
  	// Assume hi > lo. 
  	// Return an odd number between lo and hi, inclusive;
 		int oddLo, oddHi;
 		if (isOdd(lo))
 			oddLo = lo;
 		else
 			oddLo = lo + 1;
 		if (isOdd(hi))
 		  oddHi = hi;
 		else
 		  oddHi = hi - 1;
 		return oddLo + (2 * intBetween(0, (oddHi - oddLo) / 2));
 	}
 	
 	public boolean isEven (int n) {
		return (n % 2) == 0;
	}
	
	public boolean isOdd (int n) {
		return (n % 2) == 1;
	}


	
	
}