Write a program to input a number and check whether it is Perfect Cubes Number or not? (27 cubes of 3, 64 cubes of 4)

23)  Write a program to input a number and check whether it is Perfect Cubes Number or     not? (27 cubes of 3, 64 cubes of 4)

import java.util.*; 

public class Perfect_cube

{

    public static void main(String args[ ])

    {

        Scanner sc = new Scanner (System.in);

        System.out.println("Enter a number");

        double a = sc.nextInt();

        double b = Math.cbrt(a);

        int c = (int)b;

        if(b==c)

        {

            System.out.println("Entered number is a PERFECT CUBE number");

        }

        else

        {

             System.out.println("Entered number is not a PERFECT CUBE number");

        } 

    }

}