First Semester Final Exam

Code

/// Name: Raff Lisbona
/// Period: 6
/// Program Name: Final Exam
/// File Name: FinalExam.java
/// Date Finished: 1/22/2016  

import java.util.Scanner;
import java.util.Random;
public class FinalExam
{
    public static void main( String[] args )
    {
        Scanner keyboard = new Scanner(System.in);
        Random r = new Random();
        
        int flips, h = 0, t = 0;
        
        System.out.print("How many times would you like to flip the coin?");
        flips = keyboard.nextInt();
        
        if ( flips <= 4 || flips > 2100000000 )
        {
            System.out.println("You can't do that");
            System.out.println("How many times would you like to flip the coin?");
            flips = keyboard.nextInt();
        }
        for ( int n = 1; n <= flips; n++ )
        {
            int flip = r.nextInt(2);
            String coin;
            if ( flip == 1)
            {
                coin = "H";
                h++;
            }
            else 
            {
                coin = "T";
                t++;
            }
        }
        double total = h + t;
        double chanceofH = h / total;
        double chanceofT = t / total;
        double percentH = chanceofH * 100;
        double percentT = chanceofT * 100;
        System.out.println("\nTotal heads: " + h);
        System.out.println("Total tails: " + t);
        System.out.println("Total: " + total);
        System.out.println(chanceofH + "  " + chanceofT);
        System.out.println("Percent Heads: " + percentH + "%");
        System.out.println("Percent Tails: " + percentT + "%");
    }
}
    

Picture of the output