List numbers - Find largest difference

Phil Horrocks

Hi,

new to c#

I have a list of numbers List .eg {23,25,29, 32,34,37,40,43,46}. I need to find the be qucickest way of finding the largest value between the numbers in the list. The list could have upto 100 numbers. Do we have any math operations available?

Phil

8 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes13y ago
Accepted answer
I gather that what you wanted here is the maximum difference between consecutive elements of the list and not between any two elements of the list as we were all assuming previously.

If so, then the following will execute more quickly and require less memory than what you currently have:

using System;
using System.Collections.Generic;

class Program
{
static void Main()
{
var testList = new List{2223, 2229, 2235, 2240};
int max = Int32.MinValue;
int delta = 0;

for(int i = 1; i < testList.Count; i++)
{
delta = testList[i] - testList[i - 1];
if (delta > max) max = delta;
}

Console.WriteLine("The maximum difference is {0}", max);
Console.ReadKey();
}
}
0
Phil Horrocks13y ago
Ok, managed to work out the maximum gap between numbers in a list. The result is 6
using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;

class Test

{

    static void Main()

    {

        int delta;

        List<int> testList = new List<int>();

        List<int> maxTimeList = new List<int>();

                testList.Add(2223);

                testList.Add(2229);

                testList.Add(2235);

                testList.Add(2240);

                testList.Reverse();

        int num = 1;

        for (int i = 0; i < testList.Count; i++) // Loop through List with for

        {

            //Console.WriteLine(testList[i]);
            if (num >= testList.Count) {

            break;
            }

            else

            delta = (testList [i] - testList [num]);

            //Console.WriteLine (delta);

            num = num +1;
            maxTimeList.Add(delta);

        }

        Console.WriteLine (maxTimeList.Max ());
        Console.Read(); // Pause.

    }

}
0
Hardik Patel13y ago
```
 for(i=0;iif(max
```
0
Vulpes13y ago
Try this:

using System;
using System.Collections.Generic;

class Program
{
static void Main()
{
var list = new List{34,37,40,43,46,23,25,29,32}; // unsorted
list.Sort();
int lowest = list[0];
int highest = list[list.Count - 1];
int maxDiff = highest - lowest;
Console.WriteLine("The greatest difference is {0} - {1} = {2}", highest, lowest, maxDiff);
Console.ReadKey();
}
}
0
13y ago
http://www.dotnetperls.com/max

using System;
using System.Linq;

namespace Console1
{
class Program
{
static void Main(string[] args)
{
int[] arrayInt = { 23, 25, 29, 32, 34, 37, 40, 43, 46 };

Console.WriteLine(arrayInt.Max());
Console.WriteLine(arrayInt.Min());

Console.WriteLine(arrayInt.Max() - arrayInt.Min());

Console.Read();
}
}
}
0
Phil Horrocks13y ago
Hi, Thanks for the reply.. I think you misunderstood the question. I need the work out the maximum gap between the numbers in the list :)
0
Hardik Patel13y ago
int[] values = { 1,2,3,4,5,6,7,8,9,10};
Array.Sort(values);
Array.Reverse(values);
0
Hardik Patel13y ago
use array for that

first Use array.sort and then array.reverse

it will give the largest number.
0