Chapter 6, Problem 1E

Explanation of Solution

Program code:

Main.java:

//import the required header files

import java.io.*;

import java.util.*;

//define a class file_read_tot_sum

class Main

{

    //define a method evenNumber()

    public static void boyGirl(Scanner input)

    {

        //declare the required variables

        int boySum=0;

int girlSum=0;

int boys=0;

int girls=0;

int count=0;

//iterate a while loop to get the tokens

while(input.hasNext())

{

//if the value of count is equal to 0

if(count==0)

{

//next token

input.next();

//increment the value of 'boys'

boys++;

//boys sum

boySum+=input.nextInt();

//increment the value of count

count++;

}

//if the value of count is not 0

Else

{

//next token

input.next();

//increment the value of 'girls'

girls++;

//girls sum

girlSum+=input.nextInt();

//set the value of count as 0

count=0;

            }

        }

//print the number of boys and girls

System.out.println(boys + " boys, " + girls + " girls");

//prin the differnece between boys' and girls' sum

System.out.println("Difference between boys' and girls' sums: " + Math.abs(boySum-girlSum));

    }

//define the main() method

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

{

//create an object of Scanner

Scanner input=new Scanner (new File("Example.txt"));

//call the method boyGirl()

boyGirl(input);

}

}

Example.txt:

Erik 3 Rita 7 Tanner 14 Jil1yn 13 Curtis 4 Stefanie 12 Ben 6

Explanation:

The above snippet of code is used to find the number of boys and girls in the file “Example.txt”. Also the program finds the number of even numbers in the file. In the code,

• Import the required header files.
• Define a class “Main”
  • Define the “boyGirl()” method.
    • Declare the required variables.
    • Iterate a “while” loop.
      • If the value of “count” is equal to 0.
        • Take the next token using “next()” method.
        • Increment the value of “boys”.
        • Set the value of “boySum”.
        • Increment the value of “count”.
      • If the value of “count” is not equal to 0.
        • Take the next token using “next()” method.
        • Increment the value of “girls”.
        • Set the value of “girlSum”.
        • Set the value of “count”.
    • Print the count of boys and girls.
    • Print the difference of boys’ and girls’ sum.
  • Define the “main()” method.
    • Create an object of “Scanner” class.
    • Call the method “boyGirl()”.

Output:

4 boys, 3 girls

Difference between boys' and girls' sums: 5