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Program to check for Duck Number

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:

```/**
* 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(String args[])throws IOException
{
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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[Question 1] ISC 2017 Computer Practical Paper Solved – Box Packing

Solution of Program 1 of ISC 2017 Computer Science Paper 2 (Practical) Exam. Java program to input number of boxes to be packed and display the break-up of the cartons used in descending order of capacity

1. Can you give me the solution for the special two digit no.
Example:
the no. is 59
The sum of digits is:5+9=14
The product of the digits is:5*9=45
The sum of the sum and product=14+45=59

2. Programs are nice and easy to understand….

3. Very easy and good program for students.

4. 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”);
}
}