Question

1. Import file ReadingData.zip into NetBeans. Also, please download the input.txt file and store it into an appropriate folder in your drive.

a) Go through the codes then run the file and write the output with screenshot (please make sure that you change the location of the file) (20 points)

b) Write additional Java code that will show the average of all numbers in input.txt file (10 points)

import java.io.File; import java.io.FileNotFoundException; import java.util.Scanner; import java.io.*; 1- * @author mdkabir public class ReadingData { public static void main(String[] args) throws FileNotFoundException { // TODO code application logic here Scanner scan = new Scanner (System.in); int total = 0; int sentinal = -1; // Quit on-l System.out.println("Reading data from keyboard (-1 to quit): :"); System.out.print("First value: "); int value = scan.nextInt (); while (value != sentinal) total += value; System.out.print("Next value: "); value = scan.nextInt (); System.out.println("Total: " + total); // reading data from File .. // integer numbers are stored into file named "inputl.txt" // location of file is in the C:\\Users\\Name\\Desktop\\ System.out.println("=================================="); System.out.println("Reading data from file (inputl.txt)..."); File myFile = new File("C:\\Users\\Name\\Desktop\\inputl.txt"); // change the location of file Scanner sc = new Scanner (myFile); int sum = 0; while (sc.hasNextInt()) int num = sc.nextInt (); sum += num; System.out.println("Reading data from file is completed..!!!"); System.out.println("Sum of all integers from file: " + sum);

Answer 1

The output of the file, after executing the code provided by you:

run: "Reading data from keyboard (-1 to quit)::" First value: 10 Next value: 12 Next value: 11 Next value: Next value: Next value: Next value: -1 Total: 51 Reading data from file (input.txt)... Reading data from file is completed...!!! Sum of all integers from file: 55 BUILD SUCCESSFUL (total time: 12 seconds)

========================================================================================

Code after adding the logic to calculate the average of the numbers.

package readingdata;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class ReadingData {

public static void main(String[] args) throws FileNotFoundException {
Scanner scan = new Scanner(System.in);
int total=0;
int count=0; // variable count, to count the number of inputs from user
int sentinal=-1;
System.out.println("\"Reading data from keyboard (-1 to quit)::\"");
System.out.println("First value: ");
int value=scan.nextInt();
count++; // increment count by 1, for eact input

while(value!=sentinal)
{
total+=value;
System.out.println("Next value: ");
value=scan.nextInt();
count++;
}
count--;
int average=total/count; // calculate average as total/count

System.out.println("Total: " + total);
System.out.println("Average: " + average); // print average

System.out.println("======================");
System.out.println("Reading data from file (input.txt)...");
File myFile=new File("C:\\Users\\123\\Desktop\\Input.txt");
Scanner sc = new Scanner(myFile);

int sum=0;
count=0; // again intialize count to 0, to count numbers in file

while(sc.hasNextInt())
{
int num=sc.nextInt();
sum+=num;
count++; // intialize count by 1 for each number in file
}
average=sum/count; // calculate average as sum/count

System.out.println("Reading data from file is completed...!!!");
System.out.println("Sum of all integers from file: " + sum);
System.out.println("Average of all integers from file: " + average); // print average from file
}
  
}

======================================================================================

Output after applying the logic for average:

run: "Reading data from keyboard (-1 to quit)::" First value: 12 Next value: 13 Next value: 4 Next value: Next value: Next value: Next value: 13 Next value: 15 Next value: -1 Total: 80 Average: 10 ===== Reading data from file (input.txt)... Reading data from file is completed...!!! Sum of all integers from file: 55 Average of all integers from file: 5 BUILD SUCCESSFUL (total time: 16 seconds)