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Comparing C# Int Arrays

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Comparing C# Int Arrays

Jun 25th, 2009

Hello all...my first official post (after the introduction)

I'm relatively new in the area of C# (some PHP experience) and I'm hoping someone can help me.

I have 2 arrays of variable lengths, with int data in them. Something like this:

FreeNumbers = 1,2,3,4,5
UsedNumbers = 1,2

I want to take the first FreeNumber (1) and search through the used number array. If it exists there I want to move on to the next FreeNumber (2) and do the same. Once I find a FreeNumber (3) that is NOT in the UsedNumber array, I want to assign it to another var (TheNextFreeNumber).

Can someone help me with this? I was thinking this should be done through For's, ForEach or Try/Catch but I'm just not quite getting there. Maybe there is an even simpler C# function?

Thanks for any help.

-Chris

Chris Cummings - www.iwdonline.com

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Re: Comparing C# Int Arrays

Jun 25th, 2009

Can you use generics? They are a little easier to deal with than arrays:

 Help with Code Tags 
 c# Syntax (Toggle Plain Text) 
    private void simpleButton2_Click(object sender, EventArgs e)
    {
      List<int> free = new List<int>();
      List<int> used = new List<int>();
      free.AddRange(new int[] { 1, 2, 3, 4, 5, 6 });
      used.AddRange(new int[] { 2, 3 });
 
      int nextNumber = GetNextFreeNumber(free, used);
      System.Diagnostics.Debugger.Break();
    }
    private int GetNextFreeNumber(List<int> free, List<int> used)
    {
      foreach (int i in free)
      {
        if (used.Contains(i))
          continue;
        else
        {
          used.Add(i);
          return i;
        }
      }
      throw new Exception("out of free number");
    }
    private void simpleButton2_Click(object sender, EventArgs e)
    {
      List<int> free = new List<int>();
      List<int> used = new List<int>();
      free.AddRange(new int[] { 1, 2, 3, 4, 5, 6 });
      used.AddRange(new int[] { 2, 3 });

      int nextNumber = GetNextFreeNumber(free, used);
      System.Diagnostics.Debugger.Break();
    }
    private int GetNextFreeNumber(List<int> free, List<int> used)
    {
      foreach (int i in free)
      {
        if (used.Contains(i))
          continue;
        else
        {
          used.Add(i);
          return i;
        }
      }
      throw new Exception("out of free number");
    }

Scott Knake
Custom Software Development
Apex Software, Inc.

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Re: Comparing C# Int Arrays

Jun 25th, 2009

I haven't used generics before. The arrays are already built and filled. Is there an easy way to move the aray data to the generics? There are about 300 elements per array.

-Chris

Chris Cummings - www.iwdonline.com

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Re: Comparing C# Int Arrays

Jun 25th, 2009

Yes:

 Help with Code Tags 
 c# Syntax (Toggle Plain Text) 
    private void simpleButton2_Click(object sender, EventArgs e)
    {
      int[] numbers = new int[] { 1, 2, 3, 4, 5, 6, 7 };
      List<int> lst = new List<int>();
      lst.AddRange(numbers); //adds the array to the generic list
    private void simpleButton2_Click(object sender, EventArgs e)
    {
      int[] numbers = new int[] { 1, 2, 3, 4, 5, 6, 7 };
      List<int> lst = new List<int>();
      lst.AddRange(numbers); //adds the array to the generic list

Last edited by sknake; Jun 25th, 2009 at 4:10 pm.

Scott Knake
Custom Software Development
Apex Software, Inc.

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Re: Comparing C# Int Arrays

Jun 25th, 2009

That Got It! Thank you so much! Plus I learned about Generics for the first time. Will study up more on that.

Here's the code I used in the end for those interested:

 Help with Code Tags 
 ASP.NET Syntax (Toggle Plain Text) 
List<int> free = new List<int>();
List<int> used = new List<int>();
free.AddRange(FreeNumbers); //adds the array to the generic list
used.AddRange(UsedNumbers); //adds the array to the generic list
 
foreach (int i in free)
	{
	if (used.Contains(i))
	continue;
	else
		{
		Response.Write("<hr>");
		Response.Write(i);					
		Response.Write(" is the next available number<hr>");		
		break;
		}
	}
List<int> free = new List<int>();
List<int> used = new List<int>();
free.AddRange(FreeNumbers); //adds the array to the generic list
used.AddRange(UsedNumbers); //adds the array to the generic list

foreach (int i in free)
	{
	if (used.Contains(i))
	continue;
	else
		{
		Response.Write("<hr>");
		Response.Write(i);					
		Response.Write(" is the next available number<hr>");		
		break;
		}
	}