Question

****java*** Create an application that 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.IOException;

import java.util.Random;

import java.util.Scanner;

class random_numbers {

    public static void main(String[] args) throws IOException {

        Random rn = new Random();

        // writes them to a text file on separate lines.

        FileWriter output = new FileWriter("input.txt");

        // generates 20 random numbers between 1 and 100

        for (int i = 0; i < 20; i++)

            output.write(Integer.toString(rn.nextInt(100) + 1) + "\n");

        // close file

        output.close();

        // Then the program should read the numbers from the file,

        File file = new File("input.txt");

        Scanner input = new Scanner(file);

        // calculate the average of the numbers,

        double avg = 0;

        for (int i = 0; i < 20; i++) {

            avg += input.nextInt();

        }

        avg /= 20;

        // close file

        input.close();

        // display this to the screen.

        System.out.println("Average is: " + avg);

    }

}

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Output:

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