# Smallest Even number with N digits

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
```

## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

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

 ` `

Output:

```1000
```

Time Complexity: O(1).

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