Related Articles

# Smallest N digit number which is a multiple of 5

• Difficulty Level : Basic
• Last Updated : 26 Mar, 2021

Given an integer N ≥ 1, the task is to find the smallest N digit number which is a multiple of 5.
Examples:

Input: N = 1
Output: 5
Input: N = 2
Output: 10
Input: N = 3
Output: 100

Approach:

• If N = 1 then the answer will be 5.
• If N > 1 then the answer will be (10(N – 1)) because the series of smallest multiple of 5 will go on like 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 the smallest n digit``// number which is a multiple of 5``int` `smallestMultiple(``int` `n)``{``    ``if` `(n == 1)``        ``return` `5;``    ``return` `pow``(10, n - 1);``}` `// Driver code``int` `main()``{``    ``int` `n = 4;``    ``cout << smallestMultiple(n);` `    ``return` `0;``}`

## Java

 `// Java implementation of the approach``class` `GFG {` `    ``// Function to return the smallest n digit``    ``// number which is a multiple of 5``    ``static` `int` `smallestMultiple(``int` `n)``    ``{``        ``if` `(n == ``1``)``            ``return` `5``;``        ``return` `(``int``)(Math.pow(``10``, n - ``1``));``    ``}` `    ``// Driver code``    ``public` `static` `void` `main(String args[])``    ``{``        ``int` `n = ``4``;``        ``System.out.println(smallestMultiple(n));``    ``}``}`

## Python3

 `# Python3 implementation of the approach` `# Function to return the smallest n digit``# number which is a multiple of 5``def` `smallestMultiple(n):` `    ``if` `(n ``=``=` `1``):``        ``return` `5``    ``return` `pow``(``10``, n ``-` `1``)` `# Driver code``n ``=` `4``print``(smallestMultiple(n))`

## C#

 `// C# implementation of the approach``using` `System;``class` `GFG {` `    ``// Function to return the smallest n digit``    ``// number which is a multiple of 5``    ``static` `int` `smallestMultiple(``int` `n)``    ``{``        ``if` `(n == 1)``            ``return` `5;``        ``return` `(``int``)(Math.Pow(10, n - 1));``    ``}` `    ``// Driver code``    ``public` `static` `void` `Main()``    ``{``        ``int` `n = 4;``        ``Console.Write(smallestMultiple(n));``    ``}``}`

## PHP

 ``

## Javascript

 ``
Output:
`1000`

Time Complexity: O(1)

Attention reader! Don’t stop learning now. Get hold of all the important DSA concepts with the DSA Self Paced Course at a student-friendly price and become industry ready.  To complete your preparation from learning a language to DS Algo and many more,  please refer Complete Interview Preparation Course.

In case you wish to attend live classes with experts, please refer DSA Live Classes for Working Professionals and Competitive Programming Live for Students.

My Personal Notes arrow_drop_up