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.
import java.util.*;
class duck
{//class duck opens
public static void main(String[]args)
{//main method opens
Scanner sc=new Scanner(System.in);
System.out.println("Enter a no");
int n=sc.nextInt();//variable n to accept the no
int p=1,r=0;//variable p to store the product,varible r to extract the digits
while(n>0)
{
r=n%10;
p=p*r;
n=n/10;
}
if(p==0)
System.out.println("It is a duck no");
else
System.out.println("It is not a duck no");
}//main method closes
} //class closes
