Check Whether a number is Duck Number or not

A Duck number is a positive number which has zeroes present in it, For example 3210, 8050896, 70709 are all Duck numbers. Please note that a numbers with only leading 0s is not considered as Duck Number. For example, numbers like 035 or 0012 are not considered as Duck Numbers. A number like 01203 is considered as Duck because there is a non-leading 0 present in it.

Examples :

Input : 707069
Output : It is a duck number.
Explanation: 707069 does not contains zeros at the beginning.



Input : 02364
Output : It is not a duck number.
Explanation: in 02364 there is a zero at the beginning of the number.

C++

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// C++ Program to check whether
// a number is Duck Number or not.
#include <iostream>
using namespace std;
  
// Function to check whether
// given number is duck number or not.
bool check_duck(string num)
{
    // Ignore leading 0s
    int i = 0, n = num.length();
    while (i < n && num[i] == '0')
        i++;
  
    // Check remaining digits
    while (i < n) {
        if (num[i] == '0')
            return true;
        i++;
    }
  
    return false;
}
  
// Driver Method
int main(void)
{
    string num = "1023";
    if (check_duck(num))
        cout << "It is a duck number\n";
    else
        cout << "It is not a duck number\n";
  
    return 0;
}

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Java

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// Java Program to check whether a
// number is Duck Number or not.
  
import java.io.*;
class GFG {
  
    // Function to check whether
    // the given number is duck number or not.
    static boolean check_duck(String num)
    {
        // Ignore leading 0s
        int i = 0, n = num.length();
        while (i < n && num.charAt(i) == '0')
            i++;
  
        // Check remaining digits
        while (i < n) {
            if (num.charAt(i) == '0')
                return true;
            i++;
        }
  
        return false;
    }
  
    // Driver Method
    public static void main(String args[]) throws IOException
    {
        String num = "1023";
        if (check_duck(num))
            System.out.println("It is a duck number");
        else
            System.out.println("It is not a duck number");
    }
}

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Python

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# Python program to check whether a number is Duck Number or not.
  
# Function to check whether 
# the given number is duck number or not.
def check_duck(num) :
  
    # Length of the number(number of digits)
    n = len(num) 
     
    # Ignore leading 0s
    i = 0
    while (i < n and num[i] == '0') :
        i = i + 1
  
    # Check remaining digits
    while (i < n) : 
        if (num[i] == "0") :
            return True 
        i = i + 1
  
    return False 
      
  
# Driver Method
num1 = "1023" 
if(check_duck(num1)) :
    print "It is a duck number"
else :
    print "It is not a duck number"
  
# Write Python3 code here

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C#

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// C# Program to check whether a 
// number is Duck Number or not.
using System;
  
class GFG {
      
    // Function to check whether 
    // the given number is duck
    // number or not.
    static bool check_duck( String num)
    {
          
        // Ignore leading 0s
        int i = 0, n = num.Length;
        while (i < n && num[i] == '0')
            i++;
  
        // Check remaining digits
        while (i < n) {
            if (num[i] == '0')
                return true;
            i++;
        }
  
        return false;
    }
      
  
    // Driver Method
    public static void Main()
    {
          
        String num1 = "1023"
          
        // checking number1
        if( check_duck(num1))
            Console.Write("It is a "
                      + "duck number");
        else
            Console.Write("It is not "
                    + "a duck number");
    }
}
  
// This code is contributed by
// nitin mittal.

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Output :

It is a duck number.

This article is contributed by Nikita Tiwari. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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