Question

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Write a method named coinFlip that accepts as its parameter a string holding a file name, opens that file and reads its contents as a sequence of whitespace-separated tokens. Assume that the input file data represents results of sets of coin flips. A coin flip is either the letter H or T, or the word Heads or Tails, in either upper or lower case, separated by at least one space. You should read the sequence of coin flips and output to the console the number of heads and the percentage of heads in that line, rounded to the nearest whole number. If this percentage is 50% or greater, you should print a "You win!" message; otherwise, print "You lose!". For example, consider the following input file:

H  T H  H    T
Tails taIlS   tAILs TailS heads   HEAds
   hEadS

For the input above, your method should produce the following output:

6 heads (50%)
You win!

The format of your output must exactly match that shown above. You may assume that the file contains at least 1 token of input, and that no tokens other than heads/tails or H/T will be in the lines. You may assume that the input file exists and is readable.

Constraints: Your solution should read the file only once, not make multiple passes over the file data.

Answer 1

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Code

import java.io.BufferedReader;

import java.io.FileReader;

import java.io.IOException;

import java.util.StringTokenizer;

public class Temp {

    

    

    public static void main(String[] args) {

        fun("sample.txt");

    }

    private static void fun(String fileName) {

        BufferedReader reader;

        int head=0,tail=0;

        try {

            reader = new BufferedReader(new FileReader(fileName));

            String line = reader.readLine();

            while (line != null) {

                StringTokenizer stk = new StringTokenizer(line);

                while(stk.hasMoreTokens()){

                    String tk = stk.nextToken();

                    if(tk.equalsIgnoreCase("heads") || tk.equalsIgnoreCase("H")){

                        head++;

                    }

                    else tail++;

                }

                line = reader.readLine();

            }

            reader.close();

            

            double hp = head*100.0/(head+tail);

            if(hp>=50.0)

                System.out.println(head+" heads ("+hp+"%) You win!");

            else{

                System.out.println(head+" heads ("+hp+"%) You Lose!");

            }

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

}