//********************************************************************
//  Die.java       Author: Lewis/Loftus
//
//  Represents one die (singular of dice) with faces showing values
//  between 1 and the number of faces on the die.
//********************************************************************

public class Die
{
   private final int MIN_FACES = 4;

   private int numFaces;   // number of sides on the die
   private int faceValue;  // current value showing on the die

   //-----------------------------------------------------------------
   //  Defaults to a six-sided die. Initial face value is 1.
   //-----------------------------------------------------------------
   public Die ()
   {
      numFaces = 6;
      faceValue = 1;
   }

   //-----------------------------------------------------------------
   //  Explicitly sets the size of the die. Defaults to a size of
   //  six if the parameter is invalid.  Initial face value is 1. 
   //-----------------------------------------------------------------
   public Die (int faces)
   {
      if (faces < MIN_FACES)
         numFaces = 6;
      else
         numFaces = faces;

      faceValue = 1;
   }

   //-----------------------------------------------------------------
   //  Rolls the die and returns the result.
   //-----------------------------------------------------------------
   public int roll ()
   {
      faceValue = (int) (Math.random() * numFaces) + 1;
      return faceValue;
   }

   //-----------------------------------------------------------------
   //  Returns the current die value.
   //-----------------------------------------------------------------
   public int getFaceValue ()
   {
      return faceValue;
   }
 
   public static void main(String [] args){
	   
	   int ROLLS = 10000000;
	   int count = 0;
	   Die die1 = new Die();
	   Die die2 = new Die();
	   for (int i = 0; i < ROLLS; i++){
		   	if (die1.roll() == 1 && die2.roll() == 1){
		   		count++;
		   	}  	
	   }
	   System.out.println("probability of snake eyes: " + (float)count / ROLLS);
	   System.out.println("1/36 = " + 1.0/36);
   }
}