Question

This is a java assignment Write the body of the fileAverage() method. Have it open the file specified by the parameter, read in all of the floating point numbers in the file and return their average (rounded to 1 decimal place). For the testing system to work, don't change the class name nor the method name. Furthermore, you cannot add "throws IOException" to the fileAverage() header. Additionally, the file will have different contents during testing.

public class Main { public double fileAverage( String filename ){ } public static void main( String[] args ){ Main obj = new Main(); System.out.println( obj.fileAverage( "numbers.txt") ); } }

Answer 1

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

public class Main {
   public double fileAverage(String filename) {
       double avg = 0;
       Scanner sc = null;
       try {
           //opening the file with given name
           sc = new Scanner(new File(filename));
       } catch (FileNotFoundException e) {
           e.printStackTrace();
       }
       double sum = 0, count = 0;
       //reading numbers from file
       while (sc.hasNext()) {
           //adding to sum
           sum += sc.nextDouble();
           //increasing the count
           count++;
       }
       //finding the average
       avg = sum / count;
       return avg;
   }

   public static void main(String[] args) {
       Main obj = new Main();
       System.out.println(obj.fileAverage("numbers.txt"));
   }
}

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