Duck.java

// Java Program to check whether a
// number is Duck Number or not.

import java.io.*;
class Duck {

	// Function to check whether
	// the given number is duck number or not.
	static boolean check_duck(String num)
	{
		// Ignore leading 0s
		int i = 0, n = num.length();
		while (i < n && num.charAt(i) == '0')
			i++;

		// Check remaining digits
		while (i < n) {
			if (num.charAt(i) == '0')
				return true;
			i++;
		}

		return false;
	}

	public static void main(String args[]) throws IOException
	{
		String num = "1023";
		if (check_duck(num))
			System.out.println("It is a duck number");
		else
			System.out.println("It is not a duck number");
	}
}