Smallest N digit number which is a multiple of 5 Last Updated : 09 Jun, 2022 Comments Improve Suggest changes Like Article Like Report 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: 5Input: 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 <bits/stdc++.h> 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 <?php // PHP implementation of the approach // Function to return the smallest n digit // number which is a multiple of 5 function smallestMultiple($n) { if ($n == 1) return 5; return pow(10, $n - 1); } // Driver code $n = 4; echo smallestMultiple($n); ?> JavaScript <script> // Javascript implementation of the approach // Function to return the smallest n digit // number which is a multiple of 5 function smallestMultiple(n) { if (n == 1) return 5; return Math.pow(10, n - 1); } // Driver code var n = 4; document.write(smallestMultiple(n)); // This code is contributed by noob2000. </script> Output: 1000 Time Complexity: O(logn) Auxiliary Space: O(1) Comment More infoAdvertise with us Next Article Analysis of Algorithms S spp____ Follow Improve Article Tags : Mathematical DSA Numbers Number Divisibility Practice Tags : MathematicalNumbers Similar Reads Basics & PrerequisitesLogic Building ProblemsLogic building is about creating clear, step-by-step methods to solve problems using simple rules and principles. 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