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# Largest N digit number in Base B

• Last Updated : 22 Mar, 2021

Given a positive integer N and base B, the task is to find the largest N-digit numbers of Base B in decimal form.

Examples:

Input: N = 2, B = 10
Output: 99

Input: N = 2, B = 5
Output: 24

Approach:
Since there are B digits in base B, so with these digits we can create BN strings of length N. They represent the integers in range 0 to BN – 1
Therefore, the largest N-digits number of base B in decimal form is given by BN – 1.

Below is the implementation of the above approach:

## C++

 `// C++ program for the approach``#include ``using` `namespace` `std;` `// Function to print the largest``// N-digit numbers of base b``void` `findNumbers(``int` `n, ``int` `b)``{` `    ``// Find the largest N digit``    ``// number in base b using the``    ``// formula B^N - 1``    ``int` `largest = ``pow``(b, n) - 1;` `    ``// Print the largest number``    ``cout << largest << endl;``}` `// Driver Code``int` `main()``{``    ``// Given Number and Base``    ``int` `N = 2, B = 5;` `    ``// Function Call``    ``findNumbers(N, B);` `    ``return` `0;``}`

## Java

 `// Java program for the approach``import` `java.util.*;``class` `GFG{``    ` `// Function to print the largest``// N-digit numbers of base b``static` `void` `findNumbers(``int` `n, ``int` `b)``{` `    ``// Find the largest N digit``    ``// number in base b using the``    ``// formula B^N - 1``    ``double` `largest = Math.pow(b, n) - ``1``;` `    ``// Print the largest number``    ``System.out.println(largest);``}` `// Driver Code``public` `static` `void` `main(String []args)``{``    ``// Given Number and Base``    ``int` `N = ``2``, B = ``5``;` `    ``// Function Call``    ``findNumbers(N, B);``}``}` `// This code is contributed by Ritik Bansal`

## Python3

 `# Python3 program for the above approach` `# Function to print the largest``# N-digit numbers of base b``def` `findNumbers(n, b):``    ` `    ``# Find the largest N digit``    ``# number in base b using the``    ``# formula B^N - 1``    ``largest ``=` `pow``(b, n) ``-` `1` `    ``# Print the largest number``    ``print``(largest)` `# Driver Code` `# Given number and base``N, B ``=` `2``, ``5` `# Function Call``findNumbers(N, B)` `# This code is contributed by jrishabh99`

## C#

 `// C# program for the approach``using` `System;``class` `GFG{``    ` `// Function to print the largest``// N-digit numbers of base b``static` `void` `findNumbers(``int` `n, ``int` `b)``{` `    ``// Find the largest N digit``    ``// number in base b using the``    ``// formula B^N - 1``    ``double` `largest = Math.Pow(b, n) - 1;` `    ``// Print the largest number``    ``Console.Write(largest);``}` `// Driver Code``public` `static` `void` `Main(String []args)``{``    ``// Given Number and Base``    ``int` `N = 2, B = 5;` `    ``// Function Call``    ``findNumbers(N, B);``}``}` `// This code is contributed by shivanisinghss2110`

## Javascript

 ``
Output:
`24`

Time Complexity: O(1)
Auxiliary Space: O(1)

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