**Question:**

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.

**Solution:**

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/** * The class Duck_No inputs a number and checks whether it is a Duck Number or not * @author : www.javaforschool.com * @Program Type : BlueJ Program - Java */ import java.io.*; class Duck_No { public static void main()throws IOException { BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); 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 if(ch=='0') c++; } 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"); else System.out.println("It is not a duck number"); } } |

**Output:**

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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#### About Author

A teacher whose aim is to make Java a fun to learn experience for the school students by striving to build clear fundamentals of every concepts and helping students to develop their ability to reason and logically analyze any given programs.

## Comments

## vineet

sir/madam, can we make this program like this

public class vv

{

public static void main(String args[])

{

String n=”562045″; //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=2;i0)

System.out.println(“It is a duck number”);

else

System.out.println(“It is not a duck number”);

}

}

## Java For School

Kindly re-post the code, as I am unable to read the for loop as it is messed up.

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