Write a Program in Java to input a number and check whether it is a Duck Number or not.

Note: A Duck number is a number which has zeroes present in it, but there should be no zero present in the beginning of the number. For example 3210, 7056, 8430709 are all duck numbers whereas 08237, 04309 are not.


* The class Duck_No inputs a number and checks whether it is a Duck Number or not
* @author :
* @Program Type : BlueJ Program - Java

class Duck_No
    public static void main(String args[])throws IOException
        BufferedReader br=new BufferedReader(new InputStreamReader(;
        System.out.print("Enter any number : ");
        String n=br.readLine(); //inputting the number and storing it in a String

        int l=n.length(); //finding the length (number of digit) of the number
        int c=0; //variable for counting number of zero digits
        char ch;

        for(int i=1;i<l;i++)
            ch=n.charAt(i); //extracting each digit and checking whether it is a '0' or not

        char f=n.charAt(0); //taking out the first digit of the inputted number

        if(c>0 && f!='0')
            System.out.println("It is a duck number");
            System.out.println("It is not a duck number");


Enter any number : 4013
It is a duck number

Enter any number : 0134
It is not a duck number

Enter any number : 67300987
It is a duck number

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