
Concept explainers
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”.
- If the value of “count” is equal to 0.
- 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()”.
- Define the “boyGirl()” method.
Output:
4 boys, 3 girls
Difference between boys' and girls' sums: 5
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Chapter 6 Solutions
MyProgrammingLab with Pearson eText -- Access Code Card -- for Building Java Programs
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