Largest Even and Odd N-digit numbers

Last Updated : 22 Jun, 2022

Given an integer N, the task is to find the largest even and odd N-digit numbers.
Examples:

Input: N = 4
Output:
Even = 9998
Odd = 9999
Input: N = 2
Output:
Even = 98
Odd = 99

Approach:

Largest N-digit even number will be (10ⁿ) - 2 because the series for different values of N will be 8, 98, 998, 9998, .....
Similarly, largest N-digit odd number will be (10ⁿ) - 1 for the series 9, 99, 999, 9999, .....

Below is the implementation of the above approach:

C++

// C++ implementation of the approach
#include <bits/stdc++.h>
using namespace std;

// Function to print the largest n-digit
// even and odd numbers
void findNumbers(int n)
{
    int odd = pow(10, n) - 1;
    int even = odd - 1;
    cout << "Even = " << even << endl;
    cout << "Odd = " << odd;
}

// Driver code
int main()
{
    int n = 4;
    findNumbers(n);

    return 0;
}

Java

// Java implementation of the approach
class GFG {

    // Function to print the largest n-digit
    // even and odd numbers
    static void findNumbers(int n)
    {
        int odd = (int)Math.pow(10, n) - 1;
        int even = odd - 1;
        System.out.println("Even = " + even);
        System.out.print("Odd = " + odd);
    }

    // Driver code
    public static void main(String args[])
    {
        int n = 4;
        findNumbers(n);
    }
}

// C# implementation of the approach
using System;
class GFG {

    // Function to print the largest n-digit
    // even and odd numbers
    static void findNumbers(int n)
    {
        int odd = (int)Math.Pow(10, n) - 1;
        int even = odd - 1;
        Console.WriteLine("Even = " + even);
        Console.Write("Odd = " + odd);
    }

    // Driver code
    public static void Main()
    {
        int n = 4;
        findNumbers(n);
    }
}

Python3

# Python3 implementation of the approach

# Function to print the largest n-digit
# even and odd numbers
def findNumbers(n):

    odd = pow(10, n) - 1
    even = odd - 1
    print("Even = ", even)
    print("Odd = ", odd)

# Driver code
n = 4
findNumbers(n)

# This code is contributed by ihritik

PHP

<?php
// PHP implementation of the approach

// Function to print the largest n-digit
// even and odd numbers
function findNumbers($n)
{
    $odd = pow(10, $n) - 1;
    $even = $odd - 1;
    echo "Even = $even \n";
    echo "Odd = $odd";
}

// Driver code
$n = 4 ;
findNumbers($n);

// This code is contributed by ihritik
?>

JavaScript

 <script>

    // Javascript implementation of the approach
    
    // Function to print the largest n-digit
    // even and odd numbers
    function findNumbers(n)
    {
        var odd = Math.pow(10, n) - 1;
        var even = odd - 1;
        document.write("Even = " + even+"<br>");
        document.write("Odd = " + odd);
    }
    
    // Driver code
    var n = 4;
    findNumbers(n);
    
    // This code is contributed by rrrtnx.
      </script>

Output:

Even = 9998
Odd = 9999

Time Complexity: O(log n)

Auxiliary Space: O(1)

Largest and Smallest N-digit Octal Numbers

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