What is Duck number?

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.

geeksforgeeks.org - Check Whether a number is Duck Number or not - GeeksforGeeks

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Check Whether a number is Duck Number or not

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.

Implementation:

C++

#include using namespace std; bool check_duck(string num) { int i = 0, n = num.length(); while (i < n && num[i] == '0' ) i++; while (i < n) { if (num[i] == '0' ) return true ; i++; } return false ; } int main( void ) { string num = "1023" ; if (check_duck(num)) cout << "It is a duck number

" ; else cout << "It is not a duck number

" ; return 0; } Java

import java.io.*; class GFG { static boolean check_duck(String num) { int i = 0 , n = num.length(); while (i < n && num.charAt(i) == '0' ) i++; while (i < n) { if (num.charAt(i) == '0' ) return true ; i++; } return false ; } 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" ); } } Python def check_duck(num) : n = len (num) i = 0 while (i < n and num[i] = = '0' ) : i = i + 1 while (i < n) : if (num[i] = = "0" ) : return True i = i + 1 return False num1 = "1023" if (check_duck(num1)) : print "It is a duck number" else : print "It is not a duck number" C# using System; class GFG { static bool check_duck( String num) { int i = 0, n = num.Length; while (i < n && num[i] == '0' ) i++; while (i < n) { if (num[i] == '0' ) return true ; i++; } return false ; } public static void Main() { String num1 = "1023" ; if ( check_duck(num1)) Console.Write( "It is a " + "duck number" ); else Console.Write( "It is not " + "a duck number" ); } } Javascript

Output It is a duck number

Time Complexity: O(n) where n is length of string.

Auxiliary Space: O(1)

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