import java.util.Scanner;

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

        Scanner scan = new Scanner(System.in);

        String a = scan.nextLine();
        double b = Double.parseDouble(a);
        double c;
        double d = b;

        double mass[] = new double[(int)b];

        while (b != 0) {
            c = Math.sqrt(scan.nextDouble());
            mass[(int)(b - 1)] = c;
            b--;
        }
        for (double i = 0; i < d; i++) {
            System.out.printf("%.4f\n", mass[(int)i]);
        }
    }
}

Outputs "Runtime error"

Edited by author 09.10.2017 00:50

Please look at example, try to find count of inputs you are reading into b.