In any number if there is one or more zero then that number is a duck
number. But if the zero is in first digit of the number then that number is not
a duck number. For example 105, 20, 3030, 701.
But 020, 0100, 0104 are not duck number as these numbers start with
zero.
import java.io.*;
class DuckNo
{
public static void main(String args[]) 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++)
{
//extracting each digit and checking whether it is a '0' or not
ch=n.charAt(i);
if(ch=='0')
c++;
}
char f=n.charAt(0); //taking out the first digit of the in putted 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 : 105
It is a duck number
Enter any number : 020
It is not a duck number
Enter any number : 10006
It is a duck number
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Peterson Number, Magic Number, Krishnamurty Number
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