/**
*  recursive method to count the number of zeros in a non-negative number
*
*  @author Savitch
*/

public class CountZeros
{
    public int numberOfZeros (int n)
	 {
	    if (n == 0)
		     return 1;
		 else if (n < 10)
		     return 0;
		 else if (n%10 == 0)
		    return  numberOfZeros(n/10) + 1;
		 else
		    return numberOfZeros(n/10);
	}
}