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Largest Even and Odd N-digit numbers in Octal Number System
  • Last Updated : 23 Feb, 2021
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Given an integer N, the task is to find the largest even and odd N-digit numbers in Octal Number System.
Examples: 
 

Input: N = 4 
Output: 
Even : 7776 
Odd : 7777
Input: N = 2 
Output: 
Even : 76 
Odd : 77 
 

 

Approach: To get the largest number, the digits of the number have to be maximum possible. Since in the octal number system, the maximum digit is ‘7’. So, generate ‘7’ (N – 1) times and then append ‘6’ for even and ‘7’ for odd in the end.
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 in octal number system
void findNumbers(int n)
{
 
    // Append '7' (N - 1) times
    string ans = string(n - 1, '7');
 
    // Append '6' for an even number
    string even = ans + '6';
 
    // Append '7' for an odd number
    string odd = ans + '7';
 
    cout << "Even : " << even << endl;
    cout << "Odd : " << odd << endl;
}
 
// 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 in octal number system
static void findNumbers(int n)
{
 
    // Append '7' (N - 1) times
    String ans = "";
    for (int i = 0; i < n - 1; i++)
        ans += '7';
 
    // Append '6' for an even number
    String even = ans + '6';
 
    // Append '7' for an odd number
    String odd = ans + '7';
 
    System.out.println("Even : " + even);
    System.out.println("Odd : " + odd);
}
 
// Driver code
public static void main(String args[])
{
    int n = 4;
 
    findNumbers(n);
}
}
 
// This code is contributed by 29AjayKumar

Python3




# Python3 implementation of the approach ;
 
# Function to print the largest n-digit even
# and odd numbers in octal number system
def findNumbers(N) :
 
    # Append '7' (N - 1) times
    ans = '7' * (N - 1)
 
    # Append '6' for an even number
    even = ans + '6';
 
    # Append '7' for an odd number
    odd = ans + '7';
 
    print("Even : ", even);
    print("Odd : ", odd );
 
# Driver code
if __name__ == "__main__" :
 
    n = 4;
 
    findNumbers(n);
 
# This code is contributed by AnkitRai01

C#




// C# implementation of the approach
using System;
     
class GFG
{
 
// Function to print the largest n-digit even
// and odd numbers in octal number system
static void findNumbers(int n)
{
 
    // Append '7' (N - 1) times
    String ans = "";
    for (int i = 0; i < n - 1; i++)
        ans += '7';
 
    // Append '6' for an even number
    String even = ans + '6';
 
    // Append '7' for an odd number
    String odd = ans + '7';
 
    Console.WriteLine("Even : " + even);
    Console.WriteLine("Odd : " + odd);
}
 
// Driver code
public static void Main(String []args)
{
    int n = 4;
 
    findNumbers(n);
}
}
 
// This code is contributed by 29AjayKumar

Javascript




<script>
 
// Javascript implementation of the approach
 
// Function to print the largest n-digit even
// and odd numbers in octal number system
function findNumbers(n)
{
 
    // Append '7' (N - 1) times
    var ans = "";
    for (var i = 0; i < n - 1; i++)
        ans += '7';
 
    // Append '6' for an even number
    var even = ans + '6';
 
    // Append '7' for an odd number
    var odd = ans + '7';
 
    document.write("Even : " + even + "<br>");
    document.write("Odd : " + odd + "<br>");
}
 
// Driver code
    var n = 4;
 
    findNumbers(n);
 
// This code is contributed by Mayank Tyagi
 
</script>
Output: 
Even : 7776
Odd : 7777

 

Time Complexity: O(n)
 

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