Assignemnt Final Exam Program

Code

    ///Name: Prooz Fereydouni
    ///Period: 7
    ///Project Name: Final Exam Program
    ///File Name: SOF.java
    ///Date: 1/21/2016
  
import java.util.Random;
import java.util.Scanner;

public class SOF
{
	public static void main( String[] args )
	{
		Scanner keyboard = new Scanner(System.in);
		Random rng = new Random();

        int heads=0, tails=0, NumberFlips, FlipCount=0; // introducing heads, tails and FlipCount because they will not be initialized at the beginning which is not the case for NumberFlips as it will be initialized by user.
        String coin;
        System.out.println("How many times do you want me to flip a coin? The number should be greater than or equal to 1 and less than or equal to 2,100,000,000");
        NumberFlips = keyboard.nextInt();
        
        while(NumberFlips < 1 || NumberFlips > 2100000000) //used while because we do not want the program to run even once if the number givent isnt int the logical range
		{
                System.out.println("Wrong input. The number should be greater than or equal to 1 and less than or equal to 2,100,000,000");
                NumberFlips = keyboard.nextInt();
        }
		do //used do while becease we want the program to run and run until the we reach the number given by the user to terminate the process of flipping
		{
			int flip = rng.nextInt(2);// probability intiger which will later be translated into heads and tails

			if ( flip == 1 )
            {
				heads = heads + 1;
                coin = "heads"; // a string that is going to tell us about the outcome after every flip
            }
			else
            {
				tails = tails + 1;
                coin = "tails";
            }

			System.out.println( "You flip a coin and it is... " + coin );
            FlipCount = FlipCount + 1; // increases the flip count until it reaches the number of flips given

		}while ( NumberFlips != FlipCount );// terminates the loop until it reaches the number of flips given
        System.out.println( "Number of heads were: " + heads);
        System.out.println( "Number of tails were: " + tails);
        double probOfHeads = ((double)heads / NumberFlips) * 100; //used double for probabilities because it can have decimal.
        double probOfTails = ((double)tails / NumberFlips) * 100;
        System.out.println( "The proability of flipping another heads is: " + probOfHeads);
        System.out.println( "The proability of flipping another tails is: " + probOfTails);
        //The higher the number of flips is the closer to 50 the probability is. Here is the result of some of the trials.
        //01: 100%, 0%
        //02: 100%, 0%
        //10:  60%, 40%;
        //90000: 50.03%, 40.97%
	}
}



    

Picture of the output