Question

Create a JAVA application which generates 20 random numbers between 1 and 100 and writes them to a text file on separate lines. Then the program should read the numbers from the file, calculate the average of the numbers, and display this to the screen.

Answer 1

import java.io.File;
import java.io.FileWriter;
import java.io.PrintWriter;
import java.util.Random;
import java.util.Scanner;

public class WriteToFile {
   public static void main(String[] args)throws Exception {
       Random r = new Random();
       PrintWriter pw = new PrintWriter(new FileWriter("num.txt"));
       for(int i=0;i<20;i++)
           pw.println(r.nextInt(100));
       pw.close();
       double sum=0;
       Scanner sc = new Scanner(new File("num.txt"));
       int n=0;
       while(sc.hasNext()) {
           n=sc.nextInt();
           System.out.print(n+" ");
           sum+=n;
       }
       System.out.println("\nAverage: "+(n/20));
   }
}

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