//CoinFlip.java

import java.awt.*;
import javax.swing.*;

public class CoinFlip extends JApplet {     

    public void init() {
	String input;
	int flips;
	int heads=0, tails=0;
	int htdiff, thdiff;
	int maxhtdiff=Integer.MIN_VALUE, maxthdiff=Integer.MIN_VALUE;
	int headrun=0, maxheadrun=0;
	int tailrun=0, maxtailrun=0;
	
	input = JOptionPane.showInputDialog( "Enter number of flips" );
	flips = Integer.parseInt( input );

	for (int i=1; i<=flips; i++) {
	    if (Math.random()<.5) {       //head
		heads++;         //increment count of heads
		headrun++;       //increment run of heads
		tailrun = 0;     //reset run of tails
		if (headrun > maxheadrun)    //new longest run of heads
		    maxheadrun = headrun;
	    }
	    else {                        //tail
		tails++;         //increment count of tails
		tailrun++;       //increment run of tails
		headrun = 0;     //reset run of heads
		if (tailrun > maxtailrun)    //new longest run of tails
		    maxtailrun = tailrun;
	    }
	    
	    htdiff = heads - tails;
	    if (htdiff > maxhtdiff)      //if new max heads-tails gap
		maxhtdiff = htdiff;
	    
	    thdiff = tails - heads;
	    if (thdiff > maxthdiff)      //if new max tails-heads gap  
		maxthdiff = thdiff;
	}
	
	JOptionPane.showMessageDialog(null, 
		      "#heads="+  heads+"   "+(double)heads/flips*100+"%"+
		      "\n#tails="+tails+"   "+(double)tails/flips*100+"%");
      
	JOptionPane.showMessageDialog(null,"max heads-tails: "+maxhtdiff+
				      "  max tails-heads: "+maxthdiff+
				      "\nMax head run: "+maxheadrun+
				      "   Max tail run: "+maxtailrun);
    }
}