Assignemnt #Fall Final

Code

/// Name: Ryan Volko
/// Period: 7
/// Program Name: FallFinal
/// File Name: FallFinal.java
/// Date Finished: 1/21/2016

import java.util.Scanner;
import java.util.Random;

public class FallFinal
{
    	public static void main( String[] args )
	{
		      Scanner keyboard = new Scanner(System.in);
        Random r = new Random();
        int NF = 0;
        int NH = 0;
        int NT = 0;
        int flip = 0;
            
        System.out.println("How many flips do you want? ");
        System.out.print("> ");
        NF = keyboard.nextInt();
        
        if ( NF <= 0 )
        {
            System.out.println("Sorry that number is too small");
            System.out.println("How many flips do you want? ");
            System.out.print("> ");
            NF = keyboard.nextInt();
        }
        if (NF > 2100000000)
        {
            System.out.println("Sorry that number is too big");
            System.out.println("How many flips do you want? ");
            System.out.print("> ");
            NF = keyboard.nextInt();
        }
        
        do
        {
            int x = 1 + r.nextInt(2);
            
            if ( x == 1)
                NH ++;
            else
                NT ++;
            flip++;
        }while ( flip != NF );
        
        System.out.println("\n\n\n Heads = " + NH);
        System.out.println("\n Tails = " + NT);
        
        double PH = (double)NH/NT;
        double PT = (double)NT/NH;
        double PHH = PH/2;
        double PTT = PT/2;
            
        System.out.println("\n\n\nProbability of Head = " + PHH);
        System.out.println("\nProbability of Tail = " + PTT);
    } //do and while loops work well with keeping track of large numberds as they change while the if statements work well for determinign guidlines for specific varibles thats why I chose both
    //the larger the number the closser to .50, as seen in my picture, you get so the best number to get to .50 heads and .50 tails is 2100000
}
    
Picture of the output