Semester 1 Final

Code

      ///Name: Dakota Donahue
      ///Period: 5
      ///Project Name: Semester 1 Final
      ///File Name: DisplayProbability.java
      ///Date: 1/20/2016
      
      import java.util.Scanner;
      import java.util.Random;
      
      public class DisplayProbability
      {
          public static void main( String[] args )
          {
              Scanner keyboard = new Scanner(System.in);
              
              Random r = new Random();
              
              System.out.println( " I'm going to flip a coin and tell you how many times I get heads and how many times I get tails. From this I'll assess the probability of landing either heads or tails. " );
              
              System.out.println( " How many times ( between 1 and 2,100,000,000 flips ) would you like me to flip the coin? " );
              int flips = keyboard.nextInt();
              
              while ( flips < 1 || flips > 2100000000 )
              {
                  if ( flips < 1 )
                  {
                      System.out.println ( " This isn't a sufficient number of coin flips " );
                  }
                  else
                  {
                      System.out.println ( " You've asked me to do too many coin flips. " );
                  }
                  System.out.println( " How many times ( between 1 and 2,100,000,000 flips ) would you like me to flip the coin? " );
                  flips = keyboard.nextInt();
              }
              
              int result = 0;
              int numberOfTails = 0;
              int numberOfFlips = 0;
              
              while ( numberOfFlips < flips )
              {
                  numberOfFlips++;
                  
                  result = r.nextInt(2);
                  
                  numberOfTails = numberOfTails + result;
              }
              
              int numberOfHeads = numberOfFlips - numberOfTails;
              
              System.out.println( " Heads was rolled " + numberOfHeads + " times and tails was rolled " + numberOfTails + " times over the course of " + numberOfFlips + " coin flips. " );
              
              double probOfHeads = (double)numberOfHeads / numberOfFlips;
              
              double probOfTails = (double)numberOfTails / numberOfFlips;
              
              System.out.println( " The probability of rolling heads is " + probOfHeads + " and the probability of rolling tails is " + probOfTails );
          }
      }
      
      // In order to keep track of number of flips completed I used two variables for flips completed and flips requested by the user. I consistently referred to the final variables as "numberOf..." for logical continuity.
      
      //I was able to consistently get a 50% heads and 50% tails ratio from 10 coin flips; anything lower than that frequently would result in either a 100%, 0% ratio, a 67%, 33% ration, or a 60%, 40% ratio.
             
    

Picture of the output