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# Largest and Smallest N-digit Hexadecimal Numbers

• Last Updated : 19 May, 2021

Given an integer N, the task is to find the smallest and largest N-digit numbers Hexa-Decimal Number System.

Examples:

Input: N = 4
Output:
Largest: FFFF
Smallest: 1000

Input: N = 2
Output:
Largest: FF
Smallest: 10

Approach: The following steps can be followed to complete the required answer:

• Largest Number: To get the largest number, every digit of the number must be maximum. The maximum digit in the Hexa-Decimal number system is ‘F‘. Therefore:
```1 Digit Largest Number: 'F'
2 Digit Largest Number: 'FF'
3 Digit Largest Number: 'FFF'
.
.
.
N Digit Largest Number: 'FFF....(N) times'```
• Smallest Number: The smallest number in hexadecimal numbers is ‘0‘. The idea is that the first digit needs to be as minimal as possible other than 0 which is ‘1’ and the remaining digits need to be 0. Therefore:
```1 Digit Smallest Number: '1'
2 Digit Smallest Number: '10'
3 Digit Smallest Number: '100'
.
.
.
N Digit Smallest Number: '100....(N - 1) times'```

Below is the implementation of the above approach:

## C++

 `// C++ program to find the largest``// and smallest N-digit numbers``// in Hexa-Decimal Number System` `#include ``using` `namespace` `std;` `// Function to return the largest``// N-digit number in Hexa-Decimal``// Number System``string findLargest(``int` `N)``{``    ``// Append 'F' N times``    ``string largest = string(N, ``'F'``);` `    ``return` `largest;``}` `// Function to return the smallest``// N-digit number in Hexa-Decimal``// Number System``string findSmallest(``int` `N)``{``    ``// Append '0' (N - 1) times to 1``    ``string smallest = ``"1"` `+ string((N - 1), ``'0'``);` `    ``return` `smallest;``}` `// Function to print the largest and smallest``// N-digit Hexa-Decimal number``void` `print(``int` `largest)``{``    ``cout << ``"Largest: "` `<< findLargest(largest) << endl;``    ``cout << ``"Smallest: "` `<< findSmallest(largest) << endl;``}` `// Driver code``int` `main()``{` `    ``int` `N = 4;``    ``print(N);` `    ``return` `0;``}`

## Java

 `// Java program to find the largest``// and smallest N-digit numbers``// in Hexa-Decimal Number System``class` `GFG {``    ` `    ``// Function to return the largest``    ``// N-digit number in Hexa-Decimal``    ``// Number System``    ``static` `String findLargest(``int` `N)``    ``{``        ` `        ``String largest = ``""``;``        ``// Append 'F' N times``        ``for` `(``int` `i = ``0``; i < N ; i++)``            ``largest += ``'F'``;``    ` `        ``return` `largest;``    ``}``    ` `    ``// Function to return the smallest``    ``// N-digit number in Hexa-Decimal``    ``// Number System``    ``static` `String findSmallest(``int` `N)``    ``{``        ` `        ``String smallest = ``"1"` `;``        ``// Append '0' (N - 1) times to 1``        ``for``(``int` `i = ``0``; i < N - ``1``; i++)``            ``smallest += ``'0'``;``    ` `        ``return` `smallest;``    ``}``    ` `    ``// Function to print the largest and smallest``    ``// N-digit Hexa-Decimal number``    ``static` `void` `print(``int` `largest)``    ``{``        ``System.out.println(``"Largest: "` `+ findLargest(largest)) ;``        ``System.out.println(``"Smallest: "` `+ findSmallest(largest)) ;``    ``}``    ` `    ``// Driver code``    ``public` `static` `void` `main (String[] args)``    ``{``    ` `        ``int` `N = ``4``;``        ``print(N);``    ` `    ``}``}` `// This code is contributed by AnkitRai01`

## Python3

 `# Python3 program to find the largest``# and smallest N-digit numbers``# in Hexa-Decimal Number System` `# Function to return the largest``# N-digit number in Hexa-Decimal``# Number System``def` `findLargest(N) :` `    ``# Append 'F' N times``    ``largest ``=` `'F'``*``N` `    ``return` `largest;` `# Function to return the smallest``# N-digit number in Hexa-Decimal``# Number System``def` `findSmallest(N) :` `    ``# Append '0' (N - 1) times to 1``    ``smallest ``=` `'1'` `+` `'0'``*``(N ``-` `1``)` `    ``return` `smallest;` `# Function to print the largest and smallest``# N-digit Hexa-Decimal number``def` `printAns(largest) :` `    ``print``(``"Largest: "` `, findLargest(largest));``    ``print``(``"Smallest: "` `, findSmallest(largest));` `# Driver code``if` `__name__ ``=``=` `"__main__"` `:` `    ``N ``=` `4``;``    ``printAns(N);` `# This code is contributed by AnkitRai01`

## C#

 `// C# program to find the largest``// and smallest N-digit numbers``// in Hexa-Decimal Number System``using` `System;` `class` `GFG {``    ` `    ``// Function to return the largest``    ``// N-digit number in Hexa-Decimal``    ``// Number System``    ``static` `string` `findLargest(``int` `N)``    ``{``        ` `        ``string` `largest = ``""``;``        ` `        ``// Append 'F' N times``        ``for` `(``int` `i = 0; i < N ; i++)``            ``largest += ``'F'``;``    ` `        ``return` `largest;``    ``}``    ` `    ``// Function to return the smallest``    ``// N-digit number in Hexa-Decimal``    ``// Number System``    ``static` `string` `findSmallest(``int` `N)``    ``{``        ` `        ``string` `smallest = ``"1"` `;``        ` `        ``// Append '0' (N - 1) times to 1``        ``for``(``int` `i = 0; i < N - 1; i++)``            ``smallest += ``'0'``;``    ` `        ``return` `smallest;``    ``}``    ` `    ``// Function to print the largest and smallest``    ``// N-digit Hexa-Decimal number``    ``static` `void` `print(``int` `largest)``    ``{``        ``Console.WriteLine(``"Largest: "` `+``                    ``findLargest(largest)) ;``        ``Console.WriteLine(``"Smallest: "` `+``                    ``findSmallest(largest)) ;``    ``}``    ` `    ``// Driver code``    ``public` `static` `void` `Main(``string``[] args)``    ``{``        ``int` `N = 4;``        ``print(N);``    ``}``}` `// This code is contributed by AnkitRai01`

## Javascript

 ``
Output:
```Largest: FFFF
Smallest: 1000```

Time Complexity: O(N) where N is the length of the string.

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