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Write a program to check for Duck Numbers. it is a number containing one or more 0's as its digits. 

import java.util.*;

public class Duck {
    boolean isduck(int num) {
        for (; num != 0; num /= 10)
            if (num % 10 == 0) // if 0 is there as a digit then it is a duck number
                return true;
        return false;
    }

    public static void main(String[] args) {
        Duck a = new Duck();
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter number: ");
        int num = sc.nextInt();
        System.out.printf("Is%s a Duck Number", (a.isduck(num) ? "" : " not"));
        sc.close();
    }
}

Algorithm

void main()

  1. Initialize a object 'a' of class Duck to call its methods.
  2. Intialize the Scanner object to take input.
  3. Take the number input into integer 'num'
  4. Pass the variable 'num' into isduck() as argument and based on return value print display if it is a duck number or not.

boolean isduck(int num)

  1. Start a for for with condition num!=0 and evaluate expression as num/=10.
  2. if num is a factor of 10,(i.e. contains zero) then return true
  3. End for loop.
  4. return false as it not a duck number

Variable Description

Name Type Uses
void main()
a Duck object to call method
sc Scanner object to take user input
num int to store enetered number