// CoinExample2.java
//
// Author: Rahul Simha
// Feb, 2008.
//
// Pr[At least 1 heads in two flips]

public class CoinExample2 {

    public static void main (String[] argv)
    {
        // "Large" # trials.
	double numTrials = 1000000;

        // Count # times desired outcome shows up.
	double numSuccesses = 0;

	Coin coin = new Coin (0.6);           // Pr[heads]=0.6

	for (int n=0; n<numTrials; n++) {
	    int c1 = coin.flip ();            // The two flips.
	    int c2 = coin.flip ();

	    if ( (c1==1) || (c2==1) ) {
                // If either resulted in heads, that's a successful outcome.
		numSuccesses ++;
	    }
	}

        // Estimate. (No need to cast into double's)
	double prob = numSuccesses / numTrials;

	System.out.println ("Pr[At least 1 h in 2 flips]=" + prob + "  theory=" + 0.84);
    }
 
}