Write a program that will find the average of a list of numbers found in a file.

Question

Write a program that will find the average of a list of numbers found in a file. No input validation required. Assume the input file will have the correct type of data. The program must ask the user for the name of the file. You must have a method with the following header: public astatic double deviation This method will take a File object as input and use File I/O to calculate and return the standard deviation of a series of numbers found inside of a file. You should create your own test files to test the functionality of your program.

Explanation / Answer

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

public class Average {

   public Average() {
       // TODO Auto-generated constructor stub
   }
  
   public static double deviation(File inputFile) throws IOException
   {
       double num = 0;
       int count = 0;
       double sum = 0;
       double deviation = 0;
       Scanner scan = new Scanner(inputFile);
       while(scan.hasNext())
       {
           count++;
           num = scan.nextDouble();
           sum = sum+num;
           deviation = sum/count;
           //System.out.println("Value: "+num +" " +count +" "+sum+" "+ deviation);

       }
       scan.close();
       return deviation;      
   }
  
   public static void main(String args[]) throws IOException
   {
       Scanner sc = new Scanner(System.in);
       System.out.println("Enter the name of the file: ");
       String filename=sc.next();

       File file = new File(filename);      
       double dev = deviation(file);
       System.out.println("The standard deviation of the values in this file is: "+dev);
       sc.close();
   }
}

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