import java.util.Scanner;

public class ArrayAverage {

    public static void main(String[] args) {

        int arraySize = 0;
        float[] array;
        float average = 0;
        boolean validArraySize = false;
        String errorForArraySize = "\nError. The size of the array must be an integer number greater than 0.";
        boolean validFloatNumber = false;
        Scanner sc = new Scanner(System.in);

        System.out.println("\nWelcome to the program to calculate the average of an array of float numbers.");

        while (!validArraySize) {
            System.out.println("\nPlease insert the size of the array:");
            if (sc.hasNextInt()) {
                arraySize = sc.nextInt();
                if (arraySize > 0) {
                    validArraySize = true;
                } else {
                    // The user entered an integer number less than or equal to 0
                    System.out.println(errorForArraySize);
                }
            } else {
                // The user did not enter an integer number.
                System.out.println(errorForArraySize);
            }
            sc.nextLine();
        }

        array = new float[arraySize];

        for (int i = 0; i < array.length; i++) {
            while (!validFloatNumber) {
                System.out.println("\nPlease insert a float number for position " + i + ":");
                if (sc.hasNextFloat()) {
                    array[i] = sc.nextFloat();
                    validFloatNumber = true;
                    System.out.println("\nYou have entered " + array[i] + " for position " + i);
                    sc.nextLine();
                } else {
                    System.out.println("\nError. Not a valid float number.");
                    sc.next();
                }
            }
            validFloatNumber = false;
        }

        sc.close();

        for (int i = 0; i < array.length; i++) {
            average += array[i];
        }

        average = average / array.length;

        System.out.println("\nThe average is: " + average);
    }

}