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Smallest Even number with N digits
• Difficulty Level : Easy
• Last Updated : 25 Mar, 2021

Given a number N, the task is to find the smallest Even number with N digits.
Examples:

```Input: N = 1
Output: 0

Input: N = 2
Output: 10 ```

Approach
Case 1 : If N = 1 then answer will be 0.
Case 2 : if N != 1 then answer will be (10^(N-1)) because the series of smallest even numbers will go on like, 0, 10, 100, 1000, 10000, 100000, …..
Below is the implementation of the above approach:

C++

 `// C++ implementation of the approach``#include ``using` `namespace` `std;` `// Function to return smallest even``// number with n digits``int` `smallestEven(``int` `n)``{``    ``if` `(n == 1)``        ``return` `0;``    ``return` `pow``(10, n - 1);``}` `// Driver Code``int` `main()``{` `    ``int` `n = 4;``    ``cout << smallestEven(n);` `    ``return` `0;``}`

Java

 `// Java implementation of the approach``class` `Solution {` `    ``// Function to return smallest even``    ``// number with n digits``    ``static` `int` `smallestEven(``int` `n)``    ``{``        ``if` `(n == ``1``)``            ``return` `0``;``        ``return` `Math.pow(``10``, n - ``1``);``    ``}` `    ``// Driver code``    ``public` `static` `void` `main(String args[])``    ``{``        ``int` `n = ``4``;``        ``System.out.println(smallestEven(n));``    ``}``}`

Python3

 `# Python3 implementation of``# the approach` `# Function to return smallest``# even number with n digits``def` `smallestEven(n) :` `    ``if` `(n ``=``=` `1``):``        ``return` `0``    ``return` `pow``(``10``, n ``-` `1``)` `# Driver Code``n ``=` `4``print``(smallestEven(n))` `# This code is contributed``# by ihritik.`

C#

 `// C# implementation of the approach``using` `System;``class` `Solution {` `    ``// Function to return smallest even``    ``// number with n digits``    ``static` `int` `smallestEven(``int` `n)``    ``{``        ``if` `(n == 1)``            ``return` `0;``        ``return` `Math.pow(10, n - 1);``    ``}` `    ``// Driver code``    ``public` `static` `void` `Main()``    ``{``        ``int` `n = 4;``        ``Console.Write(smallestEven(n));``    ``}``}`

PHP

 ``

Javascript

 ``
Output:
`1000`

Time Complexity: O(1).

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