reverse number effiecient way

nathaJegamoorty Pillai

I need to reverse odd number in a list and even number in another list, I have give input as 1,2,3,4,5, and so on can any one please suggest me an efficient way to do this?

4 Replies

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Selva Ganapathy12y ago
Accepted answer
Hi Jegan Priya,
http://www.c-sharpcorner.com/UploadFile/6f0898/the-circular-stack-an-advance-in-data-structure/

You can use the above structure to meet your requirement in which you can push the odd number in front stack and even number in back stack And pop up to reverse the number

Regards,
Selva Ganapathy K
Vulpes12y ago
Well, there are a number of possibilities here including a named class/struct, a tuple, an anonymous type (local variables only) or an array of lists.

However, I think a Dictionary would be the best suggestion:

var oddEven = new Dictionary>();
oddEven.Add("even", even);
oddEven.Add("odd", odd);

// retrieve even numbers and iterate through them:

foreach(int i in oddEven["even"]) Console.Write("{0} ", i);
nathaJegamoorty Pillai12y ago
i Vulpes,
Thanks, but now need to store the numbers in a single structure that have two separate list, Please suggest me in this requirement
Vulpes12y ago
Try this:

using System;
using System.Collections.Generic;

class Program
{
static void Main()
{
int[] input = {1, 2, 3, 4, 5};
var even = new List();
var odd = new List();
for(int i = input.Length - 1; i >= 0; i--)
{
if (input[i] % 2 == 0)
{
even.Add(input[i]);
}
else
{
odd.Add(input[i]);
}
}
Console.Write("Even numbers : ");
foreach(int i in even) Console.Write("{0} ", i);
Console.Write("\nOdd numbers : ");
foreach(int i in odd) Console.Write("{0} ", i);
Console.ReadKey();
}
}

The output is:

Even numbers : 4 2
Odd numbers : 5 3 1