Reading .txt files help (Java)?

Question

I have this assignment that I don't understand how to do.. could somebody help me please?
These are the instructions:
Write a program to calculate the probability that a family with two children
will consist of two boys, a boy and a girl, or two girls.

I have a .txt file with the data and I can import it, I just don't know what to do from there.
THANKS!

ps here is the program I have so far:


import java.util.Scanner;
import java.io.File;
import java.io.IOException;
public class TextFileReader
{
public static void main(String[] args) throws IOException
{
String token = "";
File fileName = new File("MaleFemaleInFamily.txt");
Scanner inFile = new Scanner(fileName);
while (inFile.hasNext())
{
token = inFile.next( );
System.out.println (token);

Scanner in = new Scanner(System.in);

System.out.println("What is the size of the sample?" );
int samplesize = in.nextInt();

int twoBoys = samplesize/10;
int twoGirls = samplesize/10;
int oneBoneG = samplesize/10;

System.out.println("Sample Size: " + samplesize );
System.out.println("Two Boys: " + twoBoys);
System.out.println("One Boy One Girl: " + oneBoneG);
System.out.println("Two Girls: " + twoGirls);
}
inFile.close();
}//end of main method
}//end of class

Answer 1

You've obviously taken a crack at the problem, so I'd like to help. But without knowing what the file is supposed to contain, or what you're supposed to do with the data, it's hard to answer your question.



As written, your program prompts the user for every token in the file, which seems odd. Is it really supposed to be doing that?



@M

Answer 2

1

Answer 3

Here is the correct code with furthure additions to suite the requirement of the question::-

import java.util.Scanner;

import java.io.File;

import java.io.FileReader;

import java.io.IOException;

public class Family

{

public static void main(String[] args) throws IOException

{



int twoBoys = 0,twoGirls = 0,boyAndGirl = 0,sampleSize = 0,counter=0;

float probabilityOfBoy=0,probabilityOfGirl=0,probabilityOfBoyAndGirl=0;



String token = "";

Scanner inFile = new Scanner(new FileReader("MaleFemaleInFamily.txt"));

while (inFile.hasNext())

{

token = inFile.next( );

System.out.println (token);





if (token.equals("BB"))

{

twoBoys++;

counter++;



}

else if (token.equals("GG"))

{

twoGirls++;

counter++;



}

else if (token.equals("BG"))

{

boyAndGirl ++;

counter++;

}

else if (token.equals("GB"))

{ boyAndGirl++;

counter++;

}

sampleSize=counter;

System.out.println("Sample Size: " + sampleSize );

System.out.println("Two Boys: " + twoBoys);

System.out.println("One Boy One Girl: " + boyAndGirl);

System.out.println("Two Girls: " + twoGirls);

}

inFile.close();

probabilityOfBoy = (float)twoBoys / (float)sampleSize;

probabilityOfGirl = (float)twoGirls / (float)sampleSize;

probabilityOfBoyAndGirl = (float)boyAndGirl / (float)sampleSize;

System.out.println("Two Boys: "+ probabilityOfBoy);

System.out.println("One Boy One Girl: "+ probabilityOfBoyAndGirl);

System.out.println("Two Girls: " + probabilityOfGirl);



}//end of main method



}//end of class



//Note:-content of MaleFemaleInFamily.txt (sampled data)

BB

BB

BB

BB

GG

GG

GG

GG

GG

BG

BG

BG

BG

BG

BG

GB

GB

GB





Best of Luck ;-)

Answer 4

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Answer 5

going off of D Buggers program, i made one that will work with BlueJ IDE perfectly. For some reason, when i moved his program into my IDE it didn t quite work right.



import java.util.Scanner;

import java.io.File;

import java.io.FileReader;

import java.io.IOException;

public class Family

{

public static void main(String[] args) throws IOException

{

int twoBoys = 0;

int twoGirls = 0;

int boyAndGirl = 0;

int sampleSize = 0;

int counter = 0;

int probabilityOfBoy = 0;

int probabilityOfGirl = 0;

int probabilityOfBoyAndGirl = 0;



String token = "";

Scanner inFile = new Scanner(new FileReader("test1.txt"));

while (inFile.hasNext())

{

token = inFile.next( );

System.out.println(token);

if (token.equalsIgnoreCase("BB"))

{

twoBoys++;

counter++;

}

else if (token.equalsIgnoreCase("GG"))

{

twoGirls++;

counter++;

}

else if (token.equalsIgnoreCase("BG"))

{

boyAndGirl++;

counter++;

}

else if (token.equalsIgnoreCase("GB"))

{ boyAndGirl++;

counter++;

}

sampleSize = counter;

}

inFile.close();

probabilityOfBoy = ((twoBoys*100) / sampleSize);

probabilityOfGirl = ((twoGirls*100) / sampleSize);

probabilityOfBoyAndGirl = ((boyAndGirl*100) / sampleSize);

System.out.println("Sample Size: "+ sampleSize);

System.out.println("Two Boys: "+ probabilityOfBoy+"%");

System.out.println("One Boy One Girl: "+ probabilityOfBoyAndGirl+"%");

System.out.println("Two Girls: " + probabilityOfGirl+"%");





}//end of main method

}//end of class