/** Driver.java -- Let's roll a pair of die a bunch of times to see how often
 *  a desired sum comes up.  We can do this to check an expected "empirical
 *  probablility".  For example, we can test to see if you can really roll
 *  a 7 one-sixth of the time.
 */
import java.util.Scanner;

public class Driver
{
  public static void main(String [] args)
  {
    Scanner kbd = new Scanner(System.in);

    // Ask for the necessary input...
    System.out.printf("How many sides on a die?  ");
    int numSides = kbd.nextInt();

    System.out.printf("What sum are you looking for?  ");
    int desiredSum = kbd.nextInt();

    System.out.print("How many tries would you like?  ");
    int numRolls = kbd.nextInt();

    // Create a die object so we can roll dice.
    Die die = new Die(numSides);

    // Now let's roll the dice in a loop.
    // Note that "++" means to add 1 to a variable.
    int count = 0;
    int trial = 0;
    while (trial < numRolls)
    {
      int firstValue = die.roll();
      int secondValue = die.roll();
      int sum = firstValue + secondValue;
      
      System.out.printf("%d + %d = %d\n", firstValue, secondValue, sum);
      
      if (sum == desiredSum)
        ++count;

      ++trial;
    }

    System.out.printf("Your desired sum of %d came up %d times.\n",
                      desiredSum, count);
  }
}